locomotive speed regulation system lsr-500 · 2015. 6. 9. · the door while the dr150 and the...

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March, 1985 WP01948-0023D A-3/85-2592-1

PRINTED IN USA

SERVICE MANUAL 6289

Description, Installation, and Maintenance

LOCOMOTIVE SPEED REGULATION SYSTEM

LSR-500

UNION SWITCH & SIGNAL DIVISION AMERICAN STANDARD INC./ SWISSVALE, PA 15218

March, 1985 WP0194B-0023D A-3/85-2592-1

PRINTED IN USA

,

SERVICE MANUAL 6289

Description, Installation, and Maintenance


LSR-500


UNION SWITCH & SIGNAL el Contents

Section Page

I GENERAL INFORMATION 1-1

1. 1 INTRODUCTION 1-1

1.2 LOCOMOTIVE EQUIPMENT 1-1 1 .2. 1 Receiver-Deocder 1-1 1.2.1.1 DRS200 Logic Decoder 1-1 1.2.1.2 DR150C Receiver 1-2 1.2.1.3 UC450 UHF Converter 1-2

• 1.2.2 Auto/Manual Switch 1-2 1.2.3 Aspect/Display Unit 1-2

.'<,J 1.3.1 DT470 Transmitter 1-5 1.3.2 DST200 Logic Encoder 1-6 1.3.3 System Message Structure 1-6 1.4 SPECIFICATIONS 1-8 1.4.1 Locomotive Equipment 1-8 1.4.1.1 UC450 UHF Converter 1-8 1.4.1.2 DR150C Receiver 1-9 1. 4.2 Wayside Rack General Specifications 1-9 1.4.2.1 DT470 Transmitter 1-10

II INSTALLATION 2-1

2. 1 GENERAL 2-1 2.2 WAYSIDE EQUIPMENT 2-1 2.2.1 AC Power Inputs 2-1 2.2.2 Main-Standby Switching 2-1 2.2.3 Control Inputs 2-1 2.2.4 Antenna Inputs 2-1 2.2.5 Antenna Installation 2-2 2.2.6 Antenna Coaxial Cable Feedline 2-2 2.3 LOCOMOTIVE MOUNTED EQUIPMENT 2-3 2. 3.1 Receiver-Decoding Mounting 2-3 2.3.2 Aspect/Display Enclosure Mounting 2~4 2.3.3 AUTO/MANUAL Switch 2-4 2.3.4 Antenna Installation 2-4

III OPERATION 3-1/3-2

3. 1 WAYSIDE EQUIPMENT 3-1/3-2 3.1.1 Operating Controls 3-1/3-2 3. 1.2 Main/Standby Transfer and Test Controls 3-1/3-2 3.2 LOCOMOTIVE EQUIPMENT 3-1/3-2 3.2.1 Receiver-Decoder 3-1/3-2 3.2.2 Aspect/Display Unit 3-1/3-2 3.2.3 AUTO/MANUAL Switch 3-1/3-2

i

UNION SWITCH & SIGNAL

Section

IV

4.1 4.2 4.2. 1 4.2:2 4.2.2.1 4.2.2:2 4.2.2.3 4.2.2:4 4.2.2.5 4.3 4.3.1 4.3.1.1 4.3.1.2 4.3.1.3 4.3.2 4.3.2.1 4.3.2.2 4.3.2.3 4.3.3.4 4.3.2.5 4.3.2.6 4.3.3 4.3.4 4.3.4.1 4.3.4.2 4.3.4.3 4.4. 4.4.1

v

5. 1 5.2 5.2: 1 5.3 5.4

VI

6.1 6.1.1 6. 1.2· 6.2 6.2:1 6.2.2 6.2~3 6.2.4 6.3 6.3.1 6.3.2 6.3.3 6.3.4

PRINCIPLES OF OPERATION

GENERAL WAYSIDE OFFICE COMPONENT PCB's DST200 Logic Encoder DT470 Data Transmitter Temperature Compensation and Mod~lation Circuitry Oscillator and Multiplier Circuits Final Amplifier Stage Power Control Circuitry Detailed Circuit Description LOCOMOTIVE RECEIVER-DECODER PCB's UC450 UHF Converter Local Oscillator RF Amplifier/Mixer Temperature Compensation Section DR150C Radio Receiver General Description RF Amplifier Section Mixer/Local Oscillator I.F. Amplifier Limiter/Detector Receiver Output Circuitry DSR200 Logic Decoder DSR200 Power Supply General Description . Electrical Specifications Circuit Description ASPECT/DISPLAY UNIT PCB DI-100 Aspect Board

FIELD MAINTENANCE

PREVENTIVE MAINTENANCE TROUBLESHOOTING AND CORRECTIVE MAINTENANCE Recommended Test Equipment PROCEDURE FOR LOCOMOTIVE EQUIPMENT WAYSIDE (OFFICE) TROUBLESHOOTING

SHOP MAINTENANCE

GENERAL INFORMATION Locomotive Equipment Wayside Equipment DST200 Recommended Test Equipment Test Procedure Comments Test Set-Up Test Procedure DS"R200 Recommended Test Equipment Test Procedure Comments Test Set-Up Test Procedure

ii

4-1

4-1 4-1 4-1 4-6 4-6 4-10 4-10 4-11 4-11/4-12 4-15 4-15 4-15 4-15 4-16 4-19 4-19 4-19 4-19 4-20 4-20 4-21/4-22 4-25 4-33 4-33 4-33 4-34 4-36 4-36

5-1

5-1 5-1 5-1 5-1 5-4

6-1

6-1 6-1 6-1 6-5 6-5 6-5 6-6 6-6 6-9 6-9 6-9 6-10 6-10

"1

Section

6.4 6.4.1 6.4.2 6.4.3 6.4.4 6.4.5 5.5 6.5.1 6.5.2 6.5.3 6.6 6.6.1 6.6.2 6.7 6.7.1 6.7.2 6.7.3 6.7.4 6.7.5 6.8 6.8.1 6.8.2 6.8.3 6.8.4 6.8.5 6.8.6 6.8.7 6.8.8 6.8.9 6.8.10 6.8.11

DSR-200 POWER SUPPLY Recommended Test Equipment Test Procedure Comments Test Set-Up Test Procedure Power Supply Troubleshooting Aids DI-100 Recommended Test Equipment Test Procedure Comments Test Procedure UC450 CONVERTER ALIGNMENT Recommended Equipment Procedure DT-470 ALIGNMENT Recommended Equipment Procedure Troubleshooting Aids Output Current Component Functions DR150C Recommended Equipment Test Procedure Comments Local Oscillator Frequency Adjustment Carrier Detect Adjustment Range Limiting Data Channel Adjustments Local Oscillator Alignment R.F. Amplifier and Mixer Alignment I.F. Amplifier Alignment Limiter Detector Alignment Test Point Readings

APPENDIX A - PARTS LIST

iii


6-15 6-15 6-16 6-16 6-16 6-17 6-17 6-17 6-18 6-18 6-20 6-20 6-21 6-22 6-22 6-23 6-26 6-26 6-27 6--28 6-28 6-28 6-28 6-29 6-29 6-29 6-30 6-30 6-30 6-31 6-32


Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5 Figure 1-6 Figure 1-7 Figure 2-1 Figure 2~2 Figure 2-3 Figure 4-1 Figure 4-2 Figure 4-3 Figure 4-4 Figure 4-5 Figure 4-6 Figure 4-7 Figure 4-8 Figure 4-9 Figure 4-10 Figure 4-10 Figure 4-10 Figure 4-11 Figure 4-12 Figure 4-13 Figure 5-1 Figure 5-2 Figure 5-3 Figure 6-1 Figure 6-2 Figure 6-3 Figure · 6-4 · Figure 6-5 Figure 6-6

LIST OF ILLUSTRATIONS

LSR-500 Locomotive Speed Regulation System Components Overall Block Diagram Receiver-Decoder Aspect/Display Unit Wayside (Office) Equipment LSR-500 System Message Structure Transmission Timing Transmitting Equipment, Rear View Application Wiring Diagram, Wayside (Office) Equipment Application Wiring Diagram, Locomotive Mounted Equipment Wayside Equipment Block Diagram Locomotive Equipment Block Diagram DST200 Block Diagram DST200 Schematic Diagram DT470 Block Diagram DT470 Schematic Diagram UC450 Schematic Diagram DR150C Schematic Diagram DRS200 Block Diagram DRS200 Schematic Diagram (Sheet 1 of 3) DRS200 Schematic Diagram (Sheet 2 of 3) DRS200 Schematic Diagram (Sheet 3 of 3) DSR200 Power Supply Block Diagram DI100 Block Diagram DI-100 Schematic Diagram Internal Wiring, Aspect Display Unit Internal Wiring, Receiver-Decoder Enclosure Internal Wiring, Transmitter Rack DSR-200 Switches DSR-200 Indications DST-200 Switches and Indications DT470 Tuning Adjustment Locations DT470 Test Set Interconnection Diagrams Input Plug Information

iv

iv 1-3 1-3 1-4 1-5 1-7 1-7 2-2 2-5/2:..6 2-7/2-8 4-2 4-3 4-5 4-7/4-8 4-9 4-13/4-14 4-17/4-18 4-23/4-24

4-27/4-28 4-29/4-30 4-31/4-32 4-37 4-38 4-39/4-40 5-5/5-6 5-7/5-8 5-9/5-10 6-2 6-3 6-4 6-24 6-25 6-33/6-34

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(BLANK)

v

m UNION SWITCH & SIGNAL

AUTO/MANUAL -SWITCH

~

lOCOMo,:1v1: EQUIPMENT

WAYSIDE TRANSMITTER RACK (Front Cover Removed) _.

Figure 1-1. LSR-500 Locomotive Speed Regulation System Components

vi

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1.1 INTRODUCTION

SECTION I GENERAL INFORMATION

,UNION SWITCH & SIGNAL

The LSR-500 Locomotive Speed Regulation System, herein after referred to as the LSR-500 System, consists of the wayside transmitter rack and the locomotive mount~d receiving and display equipment. The major components of the system are shown in Figl..r'e 1-1.

As shown in the system block diagram, Figure 1-2~ the LSR-500 system provides a unidirectional radio data link from a wayside location to from one to four locomotives. The system transmits aspect and speed commands from the wayside control point to the locomotive(s). The locomotive receiving equipment receives the radio signals, selects the appropriate information from each transmission, and provides decoded and buffered signals to control the Aspect Display Unit, as well as optional external speed control equipment and brake control valves, if used.

1.2 LOCOMOTIVE EQUIPMENT

The locomotive carried equipment consists of three main units as shown in Figure 1-1. These are the Receiver-Decoder Enclosure, the Aspect/Display unit and a Auto/Manual switch.

1 .2.1 Receiver-Decoder (See Figure 1-3)

The Receiver-Decoder is housed in a sheet steel enclosure with a hinged front door which provides access to the interior. Attached to the enclosure are mounting brackets for mounting the unit.· The enclosure is also provided with knock-outs for routing cable assembly leads, power leads, etc. to terminals located· inside the enclosure. An antenna connector is located on the top of the unit.

The UHF Converter PCB UC450, Radio Receiver PCB DR150, and Logic Decoder PCB DSR200 are located on the hinged door. The DSR200 PCB is mounted directly to the door while the DR150 and the UC450 PCB's are mounted on standoffs, in that order, to the DSR200 PCB. The UHF converter, UC450, may be mounted remotely from the receiver in certain applications. In these applications, the PCB may be housed in a DRM type shielded plug-in assembly or mounted on any metallic surface.

Mounted to the fixed part of the enclosure is the Panel Assembly. The Panel Assembly contains all the relays, terminal strips and blocks, and other components such as fuses, resistors, etc.

1.2.1.1 DSR200 Logic Decoder

The DSR200 Logic Decoder detects, decodes, and verifies the incoming data messages. If no errors are detected, the data is stored and given to the interface rel~ys.

6289 P• 1-1

ffi UNION SWITCH & SIGNAL

The DSR200 has its own power supply and provides three separate output voltages for operation of the DSR circuitry and to power additional circuitry which is externally located to the DSR200 PCB.

1.2.1.2 DR150C Receiver

The DR150C Receiver is a single conversion radio receiver for detection of frequency modulation (FM). This unit is designed for reception of digital data.

1~2~1.3 UC450 UHF Converter

The UC450 circuit is a UHF down converter. This PCB accepts a 450-470 MHz input signal and converts it to an intermediate frequency I.F. of 72.14 MHz. The UC450 operates from a single 11-16 volt power source supplied from the DR150 +12 volt power terminal.

1.2.2 Auto/Manual Switch (See Figure 1-1)

This is a two position switch used to enable or disable operation of the LSR-500 System. The switch is an actuator with two contact assemblies wired in parallel. Having the switch in the AUTO position applies power to the LSR-500 System, and, if used, the speed control system and brake control valve assembly.

1.2.3 Aspect/Display Unit (See Figure 1-4)

The components of the Aspect/Display Unit are contained in a sheet steel housing. The front door is hinged for easy access to the interior for routine maintenance. Inside the unit is a printed circuit board (DI100) which receives inputs from the Receiver-Decoder and encodes them to the proper signals to drive the displays and aspects. Mounted to the hinged door are the aspect display units, digital display units, and audible alarm. Seven aspect displays are available and a three digit speed request display. Display intensity is controlled by a 3-position toggle switch (refer to Section III, Operation). Wiring is brought into the unit through a cable connector located on the bottom of the unit.

1.3 WAYSIDE TRANSMITTER RACK (See Figure 1-5)

The wayside transmitter rack consists of either one or two transmitter units depending on the specific application. A one transmitter rack u~it consists of an interconnection to the wayside control point, a logic encoder circuit card (designated DST200), a UHF RF transmitter card (designated DT470), and power supply. The power supply converts the 115 volt ac line input to +15 volts de for powering the DST200 and DT470 circuit cards.

6289 p. 1-2

... \

INPUTS FROM YAROOfFICE

CONTROLS

MAIN TRANSMIT

UNIT

LOCOMOTIVE #2

LOCOMOTIVE #3

STANDBY LOCOMOTIVE TRANSMIT #4

UNIT

Figure 1-2~ Overall Block Diagram

UNION SWITCH & SIGNAL ffi

/ ANTENNA CONN~R

Jillliiiiiiillll--111111111---.,, !

DR150C PCB DSR200 PCB

Figure 1-3. Receiver-Decoder

RELAYS AND INTERFACING COMPONENTS

6289 p. 1-3


AUDIBLE ALARM

' 3-DIGIT SPEED

DISPLAY

FRONT VIEW.

7·ASPECT DISPLAY

INTERNAL VIEW

TOGGLE SWITCH

\

6289 p. 1-4 Figure 1-4. Aspect/Display Unit

Dl·100 PCB


A two-transmitter unit provides for complete redundancy of the transmitter electronics. The two units are designated MAIN and STANDBY. Should the Main unit become inoperable, operation may be transferred to the Standby unit by means of either a panel switch or a remote contact closure which energizes relay K1. Figure 1-4 illustrates the wayside transmitter with both Main and Standby units. Note that the equipment redundancy extends to using a separate feedline and antenna for Main and Standby units.

The wayside rack is housed in an enclosed 19-inch communications rack assembly. The internal assembly consists of a test panel and a rack mounted enclosure housing the Main and Standby units.

1.3.1 DT470 Transmitter

The DT470 Transmitter is a low power FM transmitter with a nominal 2-watts RF output. This unit is designed for data transmission. The DT470 accepts the serially encoded Manchester data from the DST200 Logic Encoder and converts these data into an FM signal.

OT470 PCB \

RELAY \

TEST PANEL

ANTENNA CONNECTORS

POWER SUPPLY

Figure 1-5. Wayside (Office) Equipment 6289 p. 1.:..5


1.3.2 DST200 Logic Encoder

The DST200 Logic Encoder accepts binary inputs from an external data source in parallel from a 50 pin connector P1 for the Main transmitter unit and 50 pin connector P2 for the Standby unit. The parallel binary inputs correspond to aspect or speed commands for each of the four locomotives.

The DST200 converts these commands into a serial binary format. The complete serial message consists of address information (to select the desired locomotive), command information and security information. This serial data stream is then encoded as a Manchester II signal and used to modulate the DT470 Transmitter.

1 .3.3 System Message Structure

Figure 1-6 illustrates the LSR-500 message structure. Each transmission contains 4 messages which correspond to the four locomotives. Transmissions occur periodically at intervals of 5.5 seconds to maintain reception of current command status. An immediate transmission will result if a change in any one of the command inputs is detected. Transmissions will continue if any one of the four locomotives is selected for control. If no locomotive is selected, · transmissions will cease until the next control input is detected. Figure 1-7 illustrates the transmission timing.· The actual message leng~h will vary with the bit rate selected.

The locomotive message contains 8 address bits and 8 data bits. The locomotive addresses are tabulated in Figure 1-6. The address and comm.and information are transmitted as a complement code. Each bit is transmitted twice; once in its true state and once in its inverted state~ The receiver will thus detect an error if the true and complemented states are not detected as encoded.

The NRZ or binary data is encoded for transmission in the Manchester II format. A unique Manchester sync pattern is transmitted prior to the star~ of the data. The sense of each bit is transmitted not as a high or low logic state but as a level transition at the middle of each bit interval.

Manchester II eliminates the NRZ DC compoent. An advantage of this encoding scheme is that the code is self synchronizing on each bit interval. A binary ~

"1" is defined as a high to low transition while a binary "O" is defined as a low to high transition. If no t.,ransition is detected, a Manchester sync error is asserted at the receiver, which then searches for another sync pattern.

The Manchester signal causes the transmitter to deviate in frequency+ or - four kHz from the assigned center frequency. The center frequency is also transmitted prior to the start of the Manchester sync pattern to allow the receiver circuitry to s\abilize prior to receipt of data. A short interval of center frequency is also transmitted at the end of the message.

6289 p. 1-6

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,

. m UNION SWITCH & SIGNAL

CENTER FREQUENCY

,,.-----------, SYNC. MSG. #1 SYNC. MSG.#2 SYNC. MSG. #3 SYNC. MSG. #4 TAIL

6-8 1.5 1.5 "O" BITS BITS

"1" 14 .. , .. .. , .. : .. , LOCO. ADDRESS # MSB LSB

~· I I s "O" 1 0 0 0 1 1 0 1 0

2 0 0 1 0 1 0 1 0

64 BITS 3 0 1 0 0 1 0 1 0

B ADDRESS I DATA I ADDRESS I DATA I 4 1 0 0 0 1 0 1 0

LSB = FIRST BIT TRANSMITTED

Figure 1-6. LSR-500 System Message Structure

t...__ 5.5 - ... t~~ 5.5 ___.J r SEC. SEC.~

...._., T

CONTROL CHANGE DETECT

LOCO SELECT

BIT RATE T = TRANSMISSION TIME

600 -1,200

2,400

'- 5.5 ---1111.i.1 ~Ill-- 5.5 . _.j I., SEC. SEC.-..,

......._.._S ______ __.n·(OR LESS) n ..... ___ n_

~-____,

Figure 1-7. Transmission Timing 6289 P• 1-7

83 UNION SWITCH & SIGNAL

1. 4 SPECIFICATIONS

1.4.1 Locomotive Equipment

Equipment Enclosure

Size: Weight: Input Voltage: Input Current:

Aspect/Display Unit

Size: Weight:

Auto/Manual Switch

Size: Weight:

1.4.1.1 UC450 UHF Converter

Input frequency range: Frequency output:

Optional input fequency range: Frequency output:

Local oscillator multiplication: Local oscillator output frequency: Local oscillator fundamental frequency:

Input impedance: Output impedance:

Total gain:

Noise figure:

Operating voltage: Current drain (at 12 volts de):

Temperature range:

Input connector:

PCB dimensions:

Weight:

6289 p. 1-8

8"D x 20"W x 16"H 55 lbs. 64..;72 trdc 2 Amps nominal

4"D x 8"W x 6"H 5 Lbs.

3-1/2"0 x 3-1/2"W x 2-3/4"H 2-f/4 Lbs.

ll50-47d MHz 72.140 MHz-(I.F.)

400-440 MHz 90.200 MHz (I.F.)

X 24 Input freq. - I.F. L.O. output freq./24

50 ohms resistance 50 ohms resistive

8 DB nominal

2.5 DB

11-·16 Vdc l6 Ma

-40 to +85 degrees C

SMB-plug-in type

2.5"W x 4.0"D x .75"H

3 oz.

1.4.1.2 DR150C Receiver

Operating frequency:

Frequency determining element: Receiver type: I. F. Frequency: I. F. Bandwidth: Audio Bandwidth: Modulation acceptance: RF input impedance: Sensitivity: Selectivity:

Image and spurious rejection:

Dimensions (circuit card): RF connector:

Temperature range:

Power requirements:

Input voltage regulation:

1.4.2 · Wayside Rack General Specifications

Operating Power Rack Dimensions

Weight Temperature Range

RF Transmitter Specifications: RF-output power RF output impedance Modulation


72-76 MHz

Quartz crystal Single conversion superhetrodyne 10.7 MHz 12 KHz@ -3DB points 3.3 KHz.@ -3DB Plus and minus 5 KHz 50 ohms resistive -108 DBM for 20DB quieting

greater than 80 DB at adjacent channel, plus or minus 30 KHz from assigned frequency

Greater than 80 DB

6.25" x 6.25" x 1.0" in height SMB type receptacle

-40 to +70 degrees Centigrade

+12 volts de'@ 120 Ma. -12-volts de@ 35 Ma.

Plus or minus 5%

115 Vac, 60 Hz at 90 VA 79" High x 24" Wide x 22" in depth with door

Approximately 175 lbs. -30 to +70 degrees C

2 watts at 12.5 Vdc 0.0005% FM

For a detailed description and alignment procedures of the DT470, please refer to the DT470 service manual.

Antenna Specifications:

Feedline type 5 0 ohm heliax cable with minimum I.D. of. 0.5" and protective outer jacket (Andrews FHJ4-50B or equivalent).

6289 p. 1-9


Antenna type

Power Input

Voltage: Frequency: Power:

Temperature Range: Weight: Cabinet size:

1.4.2.1 DT470 Transmitter

Frequency Range:

Modulation Type: Frequency Stability: Duty Cycle: RF Power Output: VSWR Protection: Power Requirements: Voltage Range: ·

Spurious and Harmonics: Temperature Range: Response Time: (To - 0.5 DB Level)

Modulation Acceptance: Input Frequency Response: Dimensions: Weight:

6289 p. 1-1 O

Direction antenna, Yagi type with 9 dB minimum forward gain. (Antenna Specialities ASP-7600).

120V RMS +5% 57 to 63 Hz 100 watts max. with Main and Standby energized

-4ooc to +1ooc 300 Lbs. approximately 79-1/4"H x ~4-3/16"W

440-512-MHz

FM +.0005% Continuous 1.0 Watt at 50 Ohms Impedance Infinite VSWR, All phase angles .17 Amperes@ 15 volts 10.5 - 16 Vdc

-60db. From Fundamental Frequency -3ooc to +6ooc Less than 1 millisecond

±. 5 KHz DC to 3300 Hz 3''W x 4"L x • 75"H 4.5 oz.

2.1 GENERAL

SECTION II INSTALLATION

UNION SWITCH & SIGNAL m

Since there are considerable differences in classification yards and locomotive makes and models, each LSR-500 System is considered a custom installation. The following paragraphs provide general information on mounting and wiring the equipment that is generally common to all installation.

2.2 WAYSIDE EQUIPMENT

The data transmitting equipment is a standard 19-inch rack mounted assembly. .. All electrical connections are made at the rear of the assembly (see Figure

2-1). For application wiring of power, control and antenna inputs, see Figure 2-2. .

2.2.1 AC Power Inputs

AC power is provided to the LSR-500 rack mounted enclosure via barrier strip type termination TB1. Terminal 1 of TB1 is connected to rack ground. Terminal 1 should be connected to a suitable earth ground connection. Terminal 2 should be connected to the BX120 side of the AC line. Terminal 3 should be connected to the neutral or NX120 side of the line.

2.2.2 Main-Standby Switching

Relay K1, which is mounted within the wayside rack assembly, provides selection of either the Main or Standby transmitter unit. When K1 is deenergized, the ~ayside rack operates in the Main mode. Upon energization, K1 transfers control to the Standy unit. K1 is energized by a contact closure across te~minals 5 and 6 of TB1. This closure provides BX120 to the coil of K1. The coil rating is 3VA.

2.2.3 Control Inputs

Control inputs are provided by two 50 pin panel mounted connectors, J1 and J2. These connectors are provided for the Main and Standby units. The connector type is an AMP 50 pin type.

2.2.4 Antenna Inputs

Two type N RF connectors are provided for termination of the Main (designated P3) and Standby (designated P4) Antennas.

6289, p. 2-1


2.2.5 Antenna Installation

The antenna provided is an Antenna Specialities type ASP-760. This antenna is a Yagi type. It must be installed with the elements in the vertical position. The antenna should be oriented with the end of the antenna opposite of the feedline termination facing the intended direction of communications.

The antenna should be installed with mounting hardware supplied and according to the manufacturer's installation instructions which are packed with the antenna. The Main and Standby antennas should be mounted in a vertical plane with 6 feet minimum spacing between the mounting centerlines.

2.2.6 Antenna Coaxial Cable Feedline

The antenna coaxial cable is supplied in 150 foot lengths. If this length is not required, the cable should be trimmed and the N connectors installed.· Avoid sharp bends in routing of the antenna coaxial •. The minimum recommended bending radius is 5". The cable is made with a polyvinyl protective outer jacket. Take care not to abrade or cut this jacket during installation so as not to degrade the weather resistance of the cable.

6289, p. 2-2

MAIN ANTENNA CONNECTOR

TERMINAL BOARD

Figure 2-1. Transmitting Equipment, Rear View

UNION SWITCH & SIGNAL ffi 2.3 LOCOMOTIVE MOUNTED EQUIPMENT

The locomotive mounted equipment consist of the LSR-500 Receiver-Decoder enclosure, the Aspect/Display unit, the Auto/Manual switch and the receiving antenna. See Figure 2-5 for car-carried equipment wiring.

The following items are supplied:

Receiver-Decoder Enclosure Aspect/Display Unit Auto/Manual Switch (Change-over Switch) Cable Assembly Cable Assembly, Antenna

Cable assembly J793073-0003 is provided to connect the Receiver-Decoder and Aspect/Display unit. The Antenna cable assembly, plus a mating PL259 plug and UG175 adaptor are provided to connect the Receiver-Decoder to the UHF antenna.

Cables for connection to the Auto/Manual switch power, speed control system, and brake solenoid must be fabricated by the installer. The minimum wire recommended is #14 PVC with 600 volt insulation (type THHN or equivalent). It is recommended than external cable runs be protected by sealtight or rigid conduit where ever possible.

2.3.1 Receiver-Decoding Mounting

Receiver-Decoding is contained in a steel NEMA 12 enclosure with dimensions of 16" high x 20" wide x 811 in depth. The enclosure must be mounted in a protected area within the locomotive cab or short hood area. Refer to Figure A-3 for mechanical outline views of this enclosure. The enclosure is provided with mounting tabs for bolting to a bulkhead. The unit must be so positioned that the antenna, power, and other terminations are accessible.

CAUTION

If the enclosure is to be welded to the bulkhead, the internal electronics assembly must be temporarily removed from the enclosure. Mount the enclosure at approximately waist height on a rigid bulkhead surface.

After mounting the enclosure, the cable runs for 72 volt de power, brake, Auto/Manual switch and speed control (if provided) may be installed in the enclosure. Terminal boards TB1 and TB2 provide these terminations·. These cables must be routed through enclosure knock-outs. A pressure switch interlock may also be required if specified ?Y the application. Make these terminations according to Figure 2-3.

6289, p. 2-3


2.3.2 Aspect/Display Enclosure Mounting

This unit must be mounted within the cab at a position where it is readily visible to the engineman. The unit is provided with a swinging mounting bracket. The bracket may be temporarily removed to facilitate mounting. The enclosure should be mounted so that the toggle dimmer is in the topmost position. Mounting dimensions of the enclosure and bracket are shown in Figure A-4.

The Aspect/Display unit receives power and control signals from the Receiver/Decoder via the furnished cable assembly. After both units are mounted, trim any excess length from the cable assembly and install the connector supplied.

2.3.3 AUTO/MANUAL Switch

The AUTO/MANUAL switch is provided in an enclosure for bulkhead mounting. This unit should be mounted in a position so as· to be readily accessable to the engineman. Figure A-5 shows mo~nting dimensions while interconnecting wiring is shown in Figure 2-3.

2.3.4 Antenna Installation

The antenna must be installed on either the roof of the cab or the engine compartment. The antenna should be installed at least 10 feet from any other exisiting radio antenna on the locomotive. The cable assembly includes twenty-five feet of coaxial cable with a loose PL259 connector and adaptor.

The antenna provided is an Antenna Specialities ASPC201L. Cut the antenna rod to the required 450-470 m.Hz frequency and install according to the manufacturer's instruction sheet. After the antenna is installed, route the unconnected end of the cable to the Receiver/Encoder enclosure. Trim a:JJ.Y excess, and install the PL259A connector and adaptor furnished.

6289, p. 2-4

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6289, p. 2-7/2-8

3.1 WAYSIDE EQUI?MENT

3.1.1 Operating Controls

SECTION III OPERATION


The wayside equipment rack is designed to function completely through external control inputs from a computer or relay control interface. Consequently, there are no internal controls which may be exercised to transmit information to the locomotives.

3.1.2· Main/Standby Transfer and Test Controls

Relay K1, which is mounted within the wayside rack assembly, provides selection of either the Main or Standby transmitter unit. When K1 is deenergized, the wayside rack operates in the Main mode. Upon energization, K1 transfers control to the Standby unit. K1 is energized by a contact closure across terminals 5 and 6 TB1.

A test panel has been provided within the rack assembly for testing of the Main and Standby Transmitting Units. An outline of this test panel is shown in Figure A-2, Sheet 3.

Three toggle type controls are provided. The MAIN toggle switch applies power to the Main transmitter unit while the STANDBY toggle controls the power to.the Standby Unit. In normal operation, both switches should be in the "ON" position. The MAINT/NORM switch should be in the NORM position.

When the MAIN/NORM switch is placed in the MAINT position, the remote Main/Standby relay K1 is removed from operation. The MAINT position permits independent operation of either the Main or Standby transmitter unit.

3.2 LOCOMOTIVE EQUIPMENT

3.2~1 Receiver-Decoder

There are no external nor internal controls on this unit.

3.2.2 Aspect/Display Unit

The Aspect/Display unit is provided with a toggle type control.which may be used to vary the intensity of the panel mounted display. This switch has 3 positions, permitting three intensity levels to accommodate varying ambient lighting conditions in the cab. The levels are nominally 25%, 50%, and 100% brightness.

3.2~3 AUTO/MANUAL Switch

The AUTO/MANUAL switch supplies power to the Receiver-Decoder and, indirectly, to the display. For LSR-500 operation, this switch must be positioned to "AUTO". To disable LSR-500 operation, this switch is positioned to "MAN".

6289, p. 3-1/3-2

4.1 GENERAL

SECTION IV PRINCIPLES OF OPERATION


This section provides circuit descriptions of the different printed circuit boards that comprise the LSR-500 Locomotive Regulation System. The system. consists of the wayside office equipment and the locomotive mounted equipment. A block diagram of the wayside dff~ce equipment is shown in Figure 4-1.

The office equipment consists of either one or two individual transmitter groupings designated·Main and Standby. Only one of these units is energized at a time. If two units are provided, the selection of the unit to be energized is made via transfer relay K1. Relay K1 is controlled by an external contact to effect unit selection. A normal/maintain switch is provided on the office assemblies with Main/Standby capability to allow local unit selection for maintenance purposes. Each transmitter unit consists of three assemblies. These are a DST200 interface logic and transmitter interface unit, a DT470 radio transmitter, and an ac to de power supply.

The wayside office equipment receives inputs from the yard office control circuitry. There are a total of 33 inputs which consist of contact closures. These inputs are input to the DST200 card which encodes this information as required and supplies it to a DT470 radio transmitter.

Figure 4~2 shows a block diagram of the locomotive mounted equipment. The equipment consists of three main.units. These are the Receiver-Decoder Unit, the Aspect/Display Unit and a Auto/Manual switch~ The function of the locomotive equipment is to receive the radio signals broadcast by the wayside unit, decode these signals, select the appropriate information from each transmission, and provide suitably decoded and buffered signals to control the Aspect/Display Unit as well as an external LSR speed control and brake control valves by application.

4.2 WAYSIDE OFFICE COMPONENT PCB's

4.2.1 DST200 Logic Encoder

See Figure 4-3 for a block diagram of the DST200 Logic Encoder and Figure 4-4 for the sch~matic of this unit. Power for the operation is provided by an external de source. Typically this voltage is between +12 Vdc and +15 Vdc. The DST 200 provides this voltage to the attached radio transmittef through J1. Internal +5 Vdc power for the boards operation is provided by VR1 or VR2~

Interface between the wayside circuitry and the DST200 is provided by sections U4, U13, U14, and associated passive ci!cuitry. -Four sections of U4, an open collector Darlington drive, are used to provide four strokes to the four multiplexed inputs. D20 through D47 make up a diode matrix to allow for separate input sources to utilize the same filter network to allow for separate inut sources to utilize the same filter network and buffers. These buffers are followed by filter networks to provide immunity and surge/foreign voltage protection. These filtered signals are then applied to U13 and U14. These devices convert the 12 - 15 Vdc used to interface to the external circuitry to

6289 P• 4-1


) DST200 ~ DT470 ~

~ I INPUTS FROM

WAYSIDE CIRCUITS

POWER SUPPLY

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Figure 4-1. Wayside Equipment Block Diagram 6289 p. 4-2

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6289 P• 4-3


+5 Vdc for interface to the internal logic circuitry. The external demand signal is input through D60, buffered, and applied to the demand section of U7 via a section of U13 connected as a Schmidt trigger to prevent multiple clocking of U7.

The buffered data inputs are applied to U12.which is a parallel to serial converter. U12, in conjunction with U21 and U6, converts the parallel address and data input into the serial complement coded message. U22 is a message time counter which is incremented every 32 bit counts. The outputs of U22 are used to stroke the appropriate inputs via sections of u4 and provide the correspondence address input to U21.

U11 message length counter provides inputs to U22-and U20, the Manchester encoder, every 32 clock times to properly structure the message by increment U22 and causing U20 to interpose a sync pattern between messages. U11 also is used to clock the Transmit Enable section of U7 every message time. This section of U7 is used to detect if the "station on" bit of any of the four inputs is set. If any of the four is set the DST will continue to transmit. If a transmitter cycle occurs and none of the four "station" inputs are set, the DST ceases transmitting pending the input of a demand input.

The basic timing for the DST is provided by Y1, U10, Ui2~ U16, and a section of U5, U15, U18 and U19. Switch SB provides control of the transmission bit rate and also provides a high repetition rate feature for test purposes. U10 provides a bit rate clock input to U20 at a rate 32 times the bit rate. The transmit repetition rate circuitry provides a transmit signal every 5.5 seconds if the transmit enable is set. With SB4 closed, this signal is supplied at a higher repetition rate which is dependent upon the bit rate selected.

Actual control of transmission is performed by U3, U8 and sections of U5, U9, U18 and U19. A transmission is initiated by U8 using a demand signal from U7 or a time signal through U5. This signal initiates the transmitting time limit and a radio key on U19 and also enables the manchester encoder U20 and the message length counter U11. The radio begins transmitting data but is held at center frequency by U2 for one message time by U22. The unit then begins to transmit data from U20, the manchester encoder. After a complete transmission, the unit is reset by U3 and the radio keyed off. If the radio is not keyed off within approximately .2 sec., the transmit time limit will turn off the radio. Interface to the radio transmitter is provided by Q1 using sections of U4, U1 and U2. U2 selects whether the radio will be held at center frequency or be fed data fro!Jl U20. U1 converts the +S volt outputs of U2 to the proper level for the radio transmitter.

Switches SA1 and SA2 are provided to allow shifting the radio frequency to the high or l9w shift for maintenance purposes. The radio is keyed on by Q1 which applies positive voltage during the time that the radio is to be transmitting • . Switch SA1 is provided to allow keying the transmitt~r continuously for maintenance purposes.

6289 p. 4-4

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4.2.2 DT470 Data Transmitter

See Figure 4-5 for the block diagram and Figure 4-6 for the schematic.

The DT470 is a UHF transmitter intended for transmission of digital data. The unit is self-contained on one 3" x 4" printed circuit board. The transmitter uses a quartz crystal at a sub-multiple of 1/24 of the output frequency plus temperature compensation to achieve high frequency stability over wide temperature and power source voltage ranges. The final .amplifier utilizes microstrip circuitry for high efficiency and spurious and harmonic rejection. The transmitter will not be damaged by VSWR mismatch due to a combination of derating of the final amplifier stage and output network design.

4.2.2.1 Temperature Compensation and Modulation Circuitry

The transmitter will operate over an input voltage range of 10.5 to 16 volts de. This voltage is regulated downward to a.nominal 8 volts de by integrated circuit series regulator U1. The regulated voltage powers the oscillator circuitry (Q4) and the temperature compensation circuitry (Q1, Q-2, Q3). The temperature compensation circuitry provides an output voltage which varies with temperature in a predetermined manner. This voltage is applied to a varactor diode D1 which is in series with the quartz crystal Y1. The voltage compensates or the natural temperature drift characteristics of Y1.

The modulation input to the transmitter consists of mark and space inputs. The regulated ~oltage is made available to the external series data source for application to the mark and space input terminals. The logic levels at these terminals cause the transmitter frequency to either be at its assigned frequency fo or at a lower frequency (fo- f) or at a higher fr·equency (fo + f). The frequency shift of the carrier is obtained by first passing the logic signals through a limiter which is provided by operational amplifier U2A and associated circuitry. Then it is passed through opertional amplifiers U3B and UBA which comprises a low pass filter to· limit the harmonic content of the modulating pulse stream and then to the varactor diode D1. The mark and space inputs will cause the frequency to shift in the following manner.

Mark Space Frequency

1 0 fo 0 1 fo 1 1 (fo - f) 0 0 (fo + f)

Ground or O volt reference is referenced by Oat either mark or space input and 1 represents the regulated input voltage level. The absolute value of the modulation level is adjusted by potentiometer R26 which serves as the deviation control. The nominal deviation is plus and minus 4 KHz from the assigned frequency fo, measured at the RF-output terminal P-2. The low pass filter frequency response is -3db at 3200 Hz with a roll-off of -24db per octave. The modulation voltage may be measured at TP1.

6289 p. 4-6

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6289, P• 4-7/4-8

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TO EXTERNAL DATA SOURCE

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afo

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Figure 4-5. DT470 Block Diagram


- TRIPLER . 07 -afo

- I +V, P-1,1.

RF OUTPUT P2

6289, P• 4-9


4.2.2.2 Oscillator and Multiplier Circuits

The oscillator is comprised of transistor Q4 and associated components. Crystal Y1 is operated in the parallel resonant mode with a load capacity of 32 pfd. A varactor diode is in series with Y1 for frequency modulation of the oscillator carrier. Also in series with Y1 is a trimmer capacitor C6 for trimming of the oscillator carrier frequency.

The output network of Q& is comprised of variable inductors 11 and L2-and associated tuning capacitors. 11 and 12 are resonant at 4 fo so that the oscillator output waveform is at a multiple of 4 times the Y1 frequency. The crystal frequency is in the 18 to 21 MHz range to obtain the output frequency range of 72 to 84 MHz, at 4 fo.

The signal at 4 fo is coupled into a class A frequency doubler, transistor Q5 and associated components. The output of Q5 is at 8 fo. Variable inductors 13 and 14 and resonating capacitors are tuned to 8 fo to provide rejection of sub-harmonic carrier components. The emitter current of Q5 may be measured at test point TP2.

The 8 fo signal is amplified a class A stage provided by transistor Q5 and associated components. The output inductor L5 is resonated at 8 fo.

The amplifier signal at 8 fo is applied to transistor Q6, a class C frequency tripler. The output of Q6 is at the assigned frequency of ·24 fo. The following tuning adjustments are required by this stage.

C41, C42 Input Matching at 8 fo C43 Base Idler tuned to 24 fo C44 Fund. Frequency trap tuned to 8 fo C45 aJ.d Harmonic Trap tuned to 16 fo C46, C47 Output Network matching at 24 fo

The combination of C46, C47, and 112-form a low pass·filter and matching network to provide a 50 Ohm output impedance match to the final amplifier stage Q8.

4.2.2.3 Final Amplifier Stage

Q8 is a class C stage which provides power amplification at 24 fo. The stripline inductors and the capacitor are formed by etched copper circuits on the circuit card top and bottom surf~ces. Q8 receives its base drive power at 24 fo via input matching network consisting of C48, C49, and 1?1. Resistor B25 and a series ferrite bead inductor provide base current return. Inductor L17 is a collector de feed choke. Ferrite beads 118 and L19 provide additional circuit decoupling as do capacitors C37, C38 and C39.

The output circuit consists of a series resonant stripline circuit provided by 122 and C51. This circuit provides both impedance matching and selectivity at 24 fo. The output filter consists of-2nd harmonic trap consisting of stripline · inductor 123 and capacitor C50. A low pass filter· consisting of C52, L24, L20, C54 (a stripline capacitor) and C53, provides attenuation of all harmonic components by -60 db. C52 and C53 also provide impedance matching. C52serves as the output power adjustment control.

6289 p. 4-10

•

UNION SWITCH & SIGNAL ffi 4.2.2.4 Power Control-Circuitry

The transmitter is keyed on by application of battery or supply voltage to the advance key, pins 3 and 8, which provides power to the voltage regulator U1, frequency compensation network, Q1, Q2, Q3, limiter, U2A low pass filter, U3B, U3A, oscillator Q4 and multiplier Q5; and the key, pin 7, which supplies power to amplifier Q6. Transistor stages Q7 and Q8 operate in the class C mode and are connected to the operations voltage. There is no current drain of the transmitter when voltage is not present at the advance key and key pins.

4.2.2.5 Detailed'Circuit Description

a. Regulator Stage U1 regulates the 10.5 to 16 volt input to 8 volts de +5%. This regulated output voltage varies in a neglible manner with voltage, temperature, load and component aging. Capacitor C22-and C36 provide decoupling of U1 from other circuitry.

b. Temperature Compensation Circuit Normally, transistor Q3 determines the voltage output of this circuit which is referenced at the juncture of voltage divider resistors R7 and R8 and determined by Q3 current flow. R4 and R~ provide base current and a base operating point to Q3. Q2 is normally cut-off (no current flow) as it operates in a differential mode with Q3 and at midtemperature ranges has a much higher operating base point due to bias network R1, R2 and R3. At elevated temperatures (approximately 6o0c), the value of thermistor R1 falls, causing Q2 to conduct which in turn decreases the voltage at the juncture of R7 and R8. The voltage is thus decreased at D1, causing the oscillator frequency to be lowered.

At lowered temperatures (less than -l50C), Q1 (normally non-conducting) starts to conduct due to the increase in value of thermistor R10 in conjunction with bias resistors R6 and R9. This causes the varactor voltage to be increased, thus raising the oscillator frequency. The combination of the temperature compensation voltage, Y1 crystal thermal characteristics and other temperature effects caused by C7, and a negative temperature coefficient capacitor in the oscillator circuit enables the transmitter frequency to be maintained within .:t. 5 parts per million over the rated temperture range.

c. Limiter Circuit The limiter consists of a summing amplifier U2A with input summing resistors RP1, 1, -2, and RP2,- 3, 4 and gain resistor 826. Since the input voltage and reference voltages are regulated, U2A serves as a modulation limiter and R26 a means of deviation control.

d. Low Pass Filter Circuit U2B and U3A comprise a four-pole Butterworth type active filter with a 3200 Hz cut-off. RP1 5-6, RP1 28, RP21-1 in conjunction and capacitors C1 and C2 provide the first section of filtering with U3B while RP23-\ RP26-6 and RP27-8 with capacitors Cj, C~ and C5 provide the second section in conjunction with U3A. Resistor R11 provides signal decoupling to the varactor diode network which is at RF potential.

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UNION SWITCH & SIGNAL m 4.3 LOCOMOTIVE RECEIVER-DECODER PCB's

4.3.1 UC450 UHF Converter

The UC450 consists of two RF amplifier stages which operate at the input frequency, a mixer (or frequency converter) and a local oscillator/multiplier section. The local oscillator output signal to the mixer is at a frequency of the 450 input frequency minus the 72~14 MHz output of the UC450. The local oscillator frequency control is provided by a quartz cry.stal whose fundamental frequency is a multiple of 1/24 of the local oscillator output frequency. the local oscillator frequency control is temperature compensated to operate within 5 parts per million over the rated temperature range of the UC450. See Figure 4-7 for the schematic diagram.

4.3.1.1 Local Oscillator

The crystal oscillator is comprised of transistor Q6, quartz crystal Y1 and associated components. The crystal resonates in the parallel resonant mode. C17, a variable capacitor is connected in series with the crystal. This capacitor is the frequency adjustment for the local oscillator circuit. A varactor diode, 01 is also in series with Y1. The temperature compensation circuitry causes the voltage across 01 to vary with temperature, which results in a varying capacitance over the temperature range. By this means, the .frequency of the oscillator is regulated over the rated temperature range.

The output of Q6 is at a frequency of 4 times the Y1_ fundamental frequency. Variable inductor L15 in conjunction with C22 and C23 comprise a tuned circuit at the 4X multiple. The signal is amplified and multiplied by a factor of two by frequency multiplier Q7 and associated components. A bandpass filter consisting of variable inductors L12-and L13 and C27 thru C32 is tuned to the output frequency of Q7 at BX the Yf fundamental frequency. -The bandpass filter output is multiplied by an additional factor of three by frequency multiplier QB. A bandpass filter consisting of fixed inductors L10 and L11, and capacitors C35 thru C38 is tuned to the output frequency of the local oscillator at 24X the Y1 frequency. The output is presented to the local oscillator terminal or mixer U2.

4.3.1.2 RF Amplifier/Mixer

The input signal in the 450-470 MHz range enters the UC450 card through SMB type connector J3. Field effect transistors Q2 and Q1 provide amplification of the input signal. Four tuned circuits at the input frequency are provided by L8-C11-C12, L5-C8, L2-C4-C5 and L1-C2-C3. Both stages provide a total gain of approximately 15 dB. The Q1 output signal is presented to the double-balanced mixer, U2. U2 has a conversion loss of -6.5 dB. The U2 output at the 72.14 MHz I.F. frequency is outputted through SMB connector J1.

6289 p. 4-15


4.3.1.3 Temperature Compensation Section

Temperature compensation is provided by transistors Q3, Q4 and Q5 and associated components. The voltage output of the circuit at the emitter of Q3 is constant ov~r the temperature range of -10 to +60 degrees Centrigrade. Below the -10 degree point, the voltage output is determined by thermistor RT1 and B9-R10. The compensation voltage rises from its nominal level ~o cause the varactor bias to rise. At temperature levels above +60 degrees, the output voltage is determined by RT2, B11 and R27. This network causes the. varactor bias to fall from its nominal value at elevated temperatures. No adjustments are required for the temperature compensation circuitry. The power for this circuitry is derived from an integrated circuit voltage regulator U1. This device accepts the nominal 12 volt de power input and provides a constant 8 volts of output over the input voltage range.

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UNION SWITCH & SIGNAL ffi 4.3.2 DR150C Radio Receiver

4.3.2.1 General Description

The DR150C is a single conversion radio receiver for detection of frequency modulation (FM). This unit is designed for reception of digital data. See Figure 4-8 for the schematic diagram.

4.3.2~2 RF Amplifier Section

The DR-150C accepts RF input signals at the assigned operating frequency through an SMB type connector, J1. The input signal first passes through a bandpass filter centered at the operating frequency, Fe. This filter is comprised of variable inductors L5 and L6 and capacitors C29, 30, 31, 32 and 33. The filter provides rejection to out-of-band signals. This filter is of the 2nd order type and has a nominal bandwidth of 4 MHz at the -3DB points.

The signal at Fe is then amplified by an RF stage comprised of.FET type transistor Q3. The nominal gain of this stage is +12DB. The output of this amplifier is connected to a 2nd order bandpass filter, also centered at Fe. This filter has the same characteristics as the input filter. It is comprised of variable inductors L7, L8, and capacitors C35, 38, 39 and 40.

The bandpass filter output is then presented to Q4, a second RF amplfier, with identical gain to the Q3 stage. The output of Q4 is connected to a third 2nd order banq>ass filter consisting of variable inductors L9, L10 and capacitors C42-, 44, 45 and 46.

4.3.2.3 Mixer/Local Oscillator

The amplified signal at Fe is converted to an I.F. frequency of 10.7 MHz by double-balanced mixer U8. The mixer receives its local oscillator or L.o~ signal from the local oscillator circuitry which is comprised of transistors Q1, Q2 and associated circuitry. The mixer combines the L.O. signal and the signal at Fe and outputs a signal at the I.F. frequency of 10.7 MHz. The L.O. frequency is 10.7 MHz below Fe.

Expressed mathematically, the relationship between the carrier frequency Fe and the crystal fundamental frequency of the crystal, Fy, is:

For 72~76 MHz, Fy~(Fc-10.7)/4 For VHF, Fy=(Fc-10.7/8)

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The top marking on the quartz crystal Y1 will always indicate the assigned carrier frequency Fe, while the fundamental frequency Fy w~ll be marked on the side of the crystal case.

Example: For Fe= 72.320 ·MHz, the top marking on the case of Y1 will indicate 72R32-indicating that the crystal is for use in a receiver with a 72~32 receive frequency. The side marking will be (72~32 - 10.7)/4 or 15.405 MHz.

6289 p. 4-1'9


The exact frequency of the L.O. is adjusted by variable capacitor C87, which permits the L.O. frequency to be set within plus or minus 50 Hz.

The output of the Q2 oscillator stage is coupled to a 2 pole bandpass filter which is tuned to a multiple of 4 times the Fy frequency. The bandpass filter is comprised of variable inductors L1 and L2 in conjunction with capacitors C9, 11, 13 and 14. The filter output is presenteG to an amplifier stage comprised of transistor Q1 and associated components. For 72-76 MHz operation, Q2 operates as an amplifier stage. For VHF operation, Q1 multiplies the frequency input by a multiple of 2. The output of Q1 is filtered by a 2 pole bandpass network consisting of variable inductors L3, L 4 and capacitors C 16, 18, 19 and 20. The filter is centered on the desired L.O. output frequency. The filter output is connected to mixer U8 at a 50 ohm impedance point. A test point, TP2 is located between the L.O. output and the U8 injection input terminal. This test point may be used to measure the L.O., output power level and L.O. frequency. ·

4.3.3.4 I.F. Amplifier

The I.F. amplifier consists of.two I.F. stages consisting of FET device Q5, MOSFET device Q6, crystal filters FL1 and FL2 and associated components. The purpose of the I.F. circuitry is to provide receiver near channel selectivity and a low level of signal amplification.

Amplifier Q5 presents a 50 ohm resistive termination to the output of U8. Q5 provides a nominal ro DB of signal gain. The output of Q5 is coupled to crystal filter FL1 via an impedance matching network consisting of vaiable inductor L11 and capacitor C49. FL1 has a nominal bandwidth of 12 KHz at the -3DB points, centered at 10.700 MHz.

The filter output of FL1 is coupled to the Q6 I.F. stage via an impedance matching network consisting of variable inductor L12 and capacitor C55. Q6 provides a nominal 20 DB.of signal gain. The output of this stage is 9oupled to FL2, a crystal filter with characteristics identical to FL1. The impedance matching is provided by va_riable inductor L 13 and capacitor C57. The gain of Q6 is controlled by an automatic gain control signal which is derived from following circuitry. As the signal level of the carrier frequency input at Fe is increased, the gain of Q6 will be reduced. A.G.C. action is initiated at a nominal carrier input level to J1 of -90 DBM.

4.3.2.5 Limiter/Detector

The DR-150C signal limiting and FM detection is provided by integrated circuit U7 and associated components. The output signal of FL2 is coupled to U7 via an impedance matchi;g network, variable inductor L14 and C63 and C64.

U7 provides limiting of the I.F. input signal at a nominal level of -90 DBM or -110 DBM referred to the antenna input terminal. U7 provides the FM detection in conjunction with a crystal filter element, FL3, and tuned circuits L15-C76-C77 and L16-C78-C79. U7 provides a demodulated output signal whose amplitude is proportional to the amount of FM deviation of the carrier signal Fe. This audio signal may be measured at TP7.

6289 p. 4-20


U7 also provides an output voltage which is proportional to received signal level. This signal is termed the carrier detect signal. The processed carrier detect signai is used to alert subsequent VR10 circuitry that a carrier of adequate received level is present, i.e., a received level with a 20 DB demodulated signal-to-noise ratio. This signal is also used to control the A.G.C. response of I.F. stage Q6.

4.3.2.6 deceiver Output Circuitry

The DR-150C has two separate out put channels, a carrier detect output and a data output. These signals are made available at terminal locations for use by subsequent VR10 processsing circuitry. Refer to the schematic diagram for the location of the output and power supply connections.

The carrier detect signal from U7 is amplified by integrated circuit U5A and presented to a two-pole active low-pass circuit that is provided by U3A and associated components. The cut-off frequency (-3DB) of this filter is nominally 800 Hz. This filter serves to limit high frequency noise components from the carrier detect signal.

The carrier detect signal is then presented to an output amplifier stage, U3B. A level control, variable resistor R52, provides output adjustment of the carrier detect signal. This level is factory pre-set to. a -1.0 volt de level at a carrier frequency level of -107 DBM. The presence of this level alerts circuitry on the RAD100 card that the received data signal may be accepted. R52 may also be used to limit effective radio operating range.

The filtered carrier detect signal is also applied to the control gate of I.F. amplifier Q6 to limit the gain of this stage at higher signals. U5B provides the proper voltage level output to Q6 through a resistor network. The demodulated data output signal from U7 is amplified by U6B, U4A and U4B. The output of U7 may vary from unit to unit. R51, the data level adjust control is used to set' the data level output at the output terminal to plus and minus 3 . volts peak-to-peak.

The U7 aduio output level at TP7 is also a de offset level. To set the data output level to swing about a O volt reference level, a de reference signal is amplified by U6A an~ summed with the demodulated data signal in U4A. Variable resistor R50 provides for zero adjustment of the data output signal.

Both the data level and data zero adjustments are normally factory settings and should not have to be reset. Should recalibration of these circuits be necessary refer to Section 6.8. ·

6289, p. 4-21/4-22

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6289, p. 4-23/4-24

UNION SWITCH & SIGNAL ffi . 4.3.3 DSR200 Logic Decoder

See Figure 4-9 for a block diagram of the digital circuitry interface portion of the DSR200 and Figure 4-10 for the schematic. The function of this circuitry is to take the filtered and digitized data and carrier detect outputs of the analog section, select a message with the proper address, and check this received data for errors. If no errors are detected, the· data is stored and given to the interface relays.

The Manchester encoded data and carrier detect signals are presented to U26, the Manchester decoder unit. This device converts the input Manchester format into two level NRZ format checking for errors in the Manchester format. This device also detects the presence of a SYNC pattern in the received data stream and signals the other circuitry when to expect valid data. U26 also derives 2 synchronized clock signals from the received data which is supplied to the remaining circuitry. Clock signals for the internal operation of U26 are supplied by the clock oscillator U13. U13 outputs a signal at a frequency 32 times higher than the baud rate selected by SA switches.

The data output by U26 is conveyed to U24 and U39. These devices convert messages from a serial to a parallel fqrmat. Data must be put in a parallel form in order to allow U33 and U40 to compare the received address with the address programmed by SC switches. The parallel data output by U24 is latched into U21 and U29 if the address and complement checks are correct. Data latched into U21 and U29 is sent out via parts o~ U23 and U31 to the output relays. U22 and U30 along with parts of U10, U12, and U19 are used to detect a change in the contents of the data latched into U21 and U29. When the content of a good message.differs from the content of the previously received good message, U16 is triggered which through a part of U23 and the output relays causes a one second tone to alert the operator to a change. U34, U35 and parts of U32, U37 and U38 are used to control the station output relays through part of U31. ·U34 and U35 are configured as a timing unit which is reset with every good message received. When a good message_is not received for the time period programmed by Switahes SB1 through SB6, U37 is reset deenergizing the station on outputs. U27 and U28 perform a similar function for the Brake output using parts of U31 and U37 except that the time delay is not variable. U32 through part of U38 provides a reset to the Data latch U21 and U29. This is provided so that if the station on and brake bits are not asserted, all outputs will be deenergized. SA4 is provided to defeat this interlocking for test purposes. With SA closed the data outputs are independent of each other. SB7 and SB8 are provided to cause the station on time delay or the brake time delay to function continuously for test purposes.

Timing for message decoding purposes is performed by U25 and parts of U10, U11 and U16. U25 is configured as a 16 counter. The output of this counter is utilized to signal the error detection circuitry to check for the proper address after the first stxteen address and data bits in a message have been receive~ and then again after the sixteen complemented address and data bits have been received. Also after the first 16 bits of a message have been received U11 is set by U25 to enable the comparision of the first 16 and second 16 bits received to assure that each bit has been received with proper complement. If either an address or complement error is detected in the received message, part of U18 is set which turns off the receiving circuitry until the start of the next message.

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DRS200 Schematic Dia~am (Sheet 2 of 3)

I 6289, p. 4-29/30

•


If the thirty second data bit is received and no error has been detected, the good message portion of U18 will be set and a timing sequenced triggered by U15. This timing sequence is to assure that there are no race conditions present in the latching and outputting of the new data and also that any changes between the current good message and the previously received good message are detected and alarmed before the previous data state is lost.

Relays are provided for interfacing between the DSR200 and both the Aspect Display unit and the speed control system and brake control units. These are K1A through K9B. There are two relays per package. Also provided on this board is a resistor network which provides 16 discrete outputs for interface to the speed control system.

4.3.4 DSR200 Power Supply

4.3.4.1 General Description

The DSR200 power supply receives its input power from a nominal 72· volt de source. In normal system application, this source is the locomotive's primary bat~ery. The power supply operates over a wide input range to accommodate voltage variations in the locomotive battery supply.- The power supply may be operated from any unregulated de source with sufficient current capacity for bench testing.

The power supply provides three separate output voltages for operation of DSR200 circuitry and to power additional circuitry which is externally located to the DSR200 circuit card.

The three voltages provided are:

1. 24 volts regulated for powering external relays, the air brake valve and the aspect indicator enclosure circuitry.

2. 12-volts regulated for power DSR200 circuitry, the DR150C radio receiver card, and the UC450 UHF converter card.

3. 5 volts regulated for powering the DSR200 logic circuitry. This power is not used external to the DSR200 card.

The 24 volt voltage output is isolated from the 12-and 5 volt outputs. The 12 and 5 volt outputs hare a common circuit ground.- All three output voltages are totally isolated from the 72-volt input voltage by the inverter circuitry.

4. 3. 4 .·2 Electrical Specifications

Voltage input range: Nominal operating voltage: Input/output isolation: Input transient protection:

58 to 80 volts, nominally 72 Vdc 72 volts de 1500 volts RMS (60 Hz) 2500 volts peak, 100 microseconds with external transient filter

6289 p. 4-33


Input current at maximum rated output: Output current, 24 volts: Output current, 12 volts: Output current, 5 v~lts: Output voltage regulation, 24.volts: 12 and 5 volts: Output current limiting: Input current protection:

4.3.4.3 Circuit Description

.8 Amperes 2 Amperes maximum .5 Amperes maximum .3 Amperes maximum + 1% line and load + 2% line and load provided on 24 volt output current sensitive fuses

The power supply consists of four major circuits, a pre-inverter, inverter control circuit, inverter power switching and rectifier, filtering and regulation. See Figure 4-10 for schematic diagram and Figure 4-11 for the block diagram.

The inverter control circuit controls the power switching devices and provides voltage regulation and current limiting for the 24 volt output.

The inverter power switching section accepts the primary 72volt input and provides a transformer isolated output to the rectifier, filtering and regulation section for conversion of the switched signal into the three DC output voltages.

a. Pre-Inverter Circuit

The function of the pre-inverter is to supply operating voltage to the inverter control circuits. It is desirable to operate the inverter control circuit at the same potential as the 24 volt regulated output voltage. The pre-inverter operates from the 72 volt input source and provides a nominal 20 volts de output to the control circuitry.

The pre-inverter obtains its operating voltage from the 72 volt source through a 400 ohm resistor which is located external to the DSR200 circuit card. The 72 volt input is regulated to a 15 volt level by Zener diode D9. This regulated voltage is used to power the pre-inverter circuitry. U2 and its associated components provides a frequency source for the pre-inverter. U2consists of a free running multivibrator and a divide by-2 logic stage. The multivibrator frequency is determined by R18 and C7 and is nominally at a frequency of 50 KHz. The divide by two circuitry produces a square wave at the pre-inverter operating frequency of 25 KHz.

The 25 KHz square wave is buffered by U3 which consists of 6 CMOS type logic gates in parallel. U3 provides a low impedance drive source to the pre-inverter switching device, Q2, a power FET. Zener diode D1 is connected from the gate of Q2 to the source terminal to protect Q2 from possible over voltage at its gate termin~l. Q2 switches the 15 volt supply at a 25 KHz rate through the primary of transformer T2. The T2 secondary 25 KHz signal is rectified and filtered by D2 and CS. The output voltage at CS is nominally at a value of 20 volts+ 10%.

6289 p. 4-34

UNION SWITCH & SIGNAL ffi b. Inverter Control Circuit

The inverter control circuit consists of integrated circuit U1, transistor Q1 and associated components. Its primary function is to provide a driving signal to the inverter power switching devices Q3 and Q4, and to regulate the 24 volt output supply. This circuit also provides overcurrent and short circuit protection for the 24 volt supply.

A section of U1 provides a 20 KHz square wave oscillator. !ne frequency determining elements are C6 and R9. The 20 KHz signal is amplified and made available to the primary of transformer T1. U1 drives T1 with two equal signals that are 180 degrees out of phase. A "dead-band" of approximately 2-microseconds exists between these two signals to assure that simultaneous drive of both power devices cannot occur.

The U1 drive outputs are pulse width modulated by internal circuitry to vary the "on" to "off" interval of Q3 and Q4 so as to regulate the 24 volt output voltage. U1 obtains a feedback voltage from the 24 volt output from the resistance network comprised of R26, R27 and R28. This network is factory preset to provide the 24 volt output with no adjustment provided. The feedback signal is amplified by Q1 and associated components R2, R3, R12 and C2. This circuitry also determines the frequency response of the regulation circuitry. The amplified feedback signal is compared with an internal reference voltage provided by U1. Internal circuitry causes the width of the Q3 and Q4 drive signals to be varied to maintain the 24 volt output voltage under varying inverter input·voltage (from the 72 volt supply) and load conditions.

The output current level of the 24 volt supply is sensed by U1. If this level exceeds 2 amperes due to either overload or short circuit conditions, U1 will cause the drive signal to be removed from Q3 and Q4, so as not to damage the switching devices. The output current is sensed by the voltage developed across resistor R29. This voltage is divided by resistors R11 and R6 and presented to a terminal of U1. If the potential at this terminal exceeds .1 volt, the drive signal will be removed. The values of R6 and R11 are such that loss of drive will occur at approximately 2.5 amperes.

c. Inverter Power Switching Circuit

Power switching devices Q3 and Q4 are operated in a half-bridge type circuit configuration. This circuit offers the advantage that either switching device must only switch the primary input voltage at the 72 volt level. Q3 and Q4 receive their drive through separate secon~ary windings of T1. T1 isolates the inverter power switching circuitry from the inverter control switching circuitry. Input networks consisting of R14, R15, 03 and 04 (for Q3) and R16, R17, 05 and 06 (for Q4) provide over voltage protection to the switching device gate terminals.

6289 p. 4-35


Q3 and Q4 alternately switch supply current through the primary winding of inverter transformer T3. The midpoint of the capacitor network consisting of C16 through C19 charges up to a potential of half the input voltage. The transformer primary of T3 is fed from C16-C17 and C18-C19 in parallel. When Q3 is on, current flows into the node or center of the capacitor network. This current replaces the charge lost by both capacitors during the previous half cycle when Q4 conducted and drew current from the node of the capacitor network. Capacitors C14 and C15 isolate the transformer primary from any DC.imbalance that may be present.

Current limiting fuses F2 and F1 are connected in series with the drain terminals of Q3 and Q4 respectively. These fuses protect the devices against overcurrent conditions that may exist due to overvoltage or component failures in the inverter control circuit or the rectifier, filtering and regulation section.

Transient suppressors RV1 and RV2 se~ve to protect the switching devices from possible high voltage transients that may be induced during the switching cycle.

d. Rectifier, Filtering and Regulation Circutt

One secondary of T3 is connected to a full wave rectifier assembly consisting of U4. R21-C12 and R22~C11 protect the rectifier from transient voltages. The full wave rectified output of U4 is filtered by inductor L3 and C24 and C25. At this point in the circuit, the regulated 24 volt line is terminated on the DSR200 card for distribution to application circuits.

The other secondary of T3 is connected to a full wave bridge rectifier assembly consisting of 06. The full wave output of U6 is filtered by C20. Unlike the 24 volt output, this voltage is not regulated and will vary with the 72 volt ·input. The nominal ~alue of this voltage under load is 18 volts. Integrated circuit voltage regulator VR2-regulates the input voltage to 12 volts+?. The 12 volt output of VR2 is further regulated to 5 volts by VR3. -

4.4 ASPECT/DISPLAY UNIT PCB

4.4.1 DI-100 Aspect Board

See Figure 4-12. for a block diagram of this unit and Figure 4-13 for the schematic. Twenty-four Vdc is supplied to this board for basic power needs and input interfacing through a pair of "fast on" style connectors. Located on the board is a Zener diode and associated filtering to provide +15 volts for internal power needs. Informa,tion is input into this board through J1. A particular input is asserted by an external contact closure pulling the appropriate input pin to C24. This input is buffered by appropriate resistor/diode networks and applied to 03 and U4 which outputs a signal of either OV or +V volts.

6289 P• 4-36

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The outputs of the level shifters are applied to either one of 16 decoders or directly to the output control circuitry. The outputs of the one of sixteen decoders are applied to the output control circuitry or to the input of the 15 line to 3 digit BCD encoder. The output control circuitry is applied through appropriate open collector buffers to J1. The output of the 15 line to 3 digit BDC encoders is applied to a group of BCD to 7 segment decoders which, using open collector buffers, are output to J1.

The Intensity control unit provides a variable duty cycle 1,000 Hz signal which varies the on time of the outputs of both the output control circuitry and the segment decoders. This variable duty cycle can be on for 25%, 50%, or 100%. The appropriate duty cycle is selected through J1 by external contact closures.

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Figure 4-12. DI100 Block Diagram

6289, p. 4-38

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! 6289, P• 4-39/4-40

5.1 PREVENTIVE MAINTENANCE

SECTION V FIELD MAINTENANCE


Periodically inspect the locomotive equipment and wayside equipment as applicable for the following:

a) Damaged door seals b) Broken or loose electrical connections c) Damaged cable insulation d) Corroded and/or burnt relay contacts e) Loose or missing general fastener hardware f) Loose or damaged components

5.2 TROUBLESHOOTING AND CORRECTIVE MAINTENANCE

5.2.1 Recommended Test Equipment

The following test equipment will be required to perform routine diagnostic tests per this section.

a) Multimeter, Simpson 260 or equivalent b) Wattmeter, Bird 43 "thruline" and 2.5 watt 450 MHz element

5.3 PROCEDURE FOR LOCOMOTIVE EQUIPMENT

This section presumes that the problem noted is limited to one single locomotive. If the problem noted is common to all locomotives, refer to 5.3, Wayside Equipment.

For the following tests, the AUTO/MANUAL switch shoul~ be in the AUTO position. Remove the locomotive excitation or disable the LSR-20 System to avoid moving, the locomotive.

Problem Noted

Single command is not displayed on Aspect/Display Unit or delivered to external locomotive controls when requested at. the wayside control point.

1. Check for delivery of the command by observing the command status LED indicator light on the DSR200 card.

D24. D25. D26 D27 D28. D29 • D30. D31 D32. D33 •

• • • • • • • station on • • • • • • • brake

• • • • • hump fast • • • • • • • • • • • • • hump slow

• • • • • •. • • • back up • ••• dead slow . . . • •• auto/manual

•.•••• AUX • • flash . . . . . . . • alarm

6289, p. 5-1


2. If the command LED is not present, replace the DSR200 circuit card. If the command LED is illuminated, but indicator in Aspect/Display Unit fails to light, replace bulb in Aspect/Display Unit.

3. If indication still fails to light, check internal wiring of the Aspect/Display Unit using Figure 5-1.

4. If the wiring is intact and 24 volts present at the command input at J2, replace the DI200 circuit card within the Aspect/Display Unit. Alternately, replace the entire Aspect/Display Unit.

5. If the command is displayed but not delivered to the locomotive control circuit, check the corresponding terminal board and relay wiring in the Receiver/Decoder enclosure, see Figure 5-2~

Problem Noted:

Indication light but fail to flash.

1. Cneck D32 on the DSR200 card. If D32 flashes, proceed to step 2. If D2 does not flash, replace the DSR200.

2. Check J2, pin K of the Aspect/Display Unit for a 24 volt flashing _signal with the designated wayside command.

3. If the voltage is present, check the internal wiring of the Aspect/Display Unit. If the wiring is correct, replace the DI100 circuit card or the entire Aspect/Display Unit.

4. If the voltage is not present, check the cable connections to the Receiver/Decoder and the internal Receiver/Decoder wiring. If these connections are correct, replace the DSR200 circuit card.

Problem Noted:

Speed commands are not present at the LSR-20.

1. With a speed command energized, check for terminal 22 of TB1 of the Receiver/Decoder with respect to pins 22 and 23.

If the voltage is present, refer to the LSR-20 service manual.

2. If the voltage per step 1 is not present, check the co!1Ifections between TB1 and J2 of the DSR200.· If the connections are proper, replace the DSR200.

6289, p. 5-2

UNION SWITCH & SIGNAL ffi Problem Noted:

System fails to respond to any commands.

1. Check for indication of power to the the Receiver/Decoder by observing the POWER ON LED indicator D2 on the DSR200.

2. If D2 is not illuminated, check for 72 volts de input at fuse blocks F1 and F2. If 72 volts not present, check the external wiring for power feed continuity.

3. If 72 volts is present, check for continuity of F1 and F2 and replace if required.

4. If D2 still does not light, the DSR200 power supply if probably defective. Replace the DSR200 card.

5. If D2-is now illuminated, check for pressure of radio signal by observing D20, the Carrier Dectect LED. If D20 does not flash in accordance with the wayside transmissions, radio link continuity is not established. In this event, replace the UC450C converter and observe if D20 flashes.

6. If D20 still fails to flash, check the antenna and antenna wiring for continuity. If the antenna circuit is correct, replace the DSR200.

7 •. If D20 flashes, observe D22 and D23 on the DSR200 card. D22 should be unlit while D23 should flash in sync with D20. If these conditions are not met, replace the DSR200.

8. If these conditions are met, observe the command status lights. If the command status LEDs D24-D33 corresponding to the requested commands from the wayside transmitter are lit, check the output wiring on TB1 and TB2. ·

Problem Noted:

Requested commands are present according to DSR200 status LEDs D24-D33, but no indications are received on the Aspect/Display lights.

1. Cneck for 24 volts power at pins A and B of J2 of the Aspect/Display Unit. If this voltage is not present, check the connecting cable from the Receiver/Decoder.

2. If 24 volts is present, replace the DI200 card or the entire Aspect/Display Unit.

NOTE

When replacing the DSR200 circuit card with a spare circuit card, make sure that the dip switch settings of the replacement card are set to agree with the dip switch settings of the card being replaced.

6289, p. 5-3


5.4 WAYSIDE (OFFICE) TROUBLESHOOTING

Wayside problems are indicated by failure of all locomotive LSR-500 links.

1. If loss of communications is reported, switch from the Main to the Stan d>y transmitter unit.

2. If transfer to Standby fails to restore operation, check for availability of ac power to the rack. Also check for proper wayside console or computer interface signals.

3. Check wiring continuity and cable interconnections per the office equipment wiring diagram, Figure 1-3.

Testing of Main or Stan d>y Transmitter Unit

1. Either the Main or Standby transmitter unit may be tested while the other unit is in service. Assume that the Main transmitter unit is under test.

2~ Operation should be transferred to the Standby unit from the console. The Main switch should be in the "ON" position.

3. Gain access to the LSR-500 transmitter panel through the rear door of the relay rack.

4. Connect the wattmeter in series with the Main unit antenna lead and connect the 50-ohm·load to the output terminal of the wattmeter.

5. The DST200 transmitter card is provided with LED indicators and dip switches for diagnostics. Locate the Main DST200 transmitter card.

6. Observe that D3, the RF transmitter key light should be flashing on the DST200. A pulsed RF o~tput indication should be observed on the wattmeter.

7. Key the transmitter on continuously by depressing dip switch SA1. An RF output of 1.5 to-2 watts should be observed.

8. To check the antenna circuit, remove the 50-ohm load and place the wattmeter in the antenna feedline. Again, depress SA1 momentarily and observe a forward power reading of 1.5 to 2.5 watts and a reverse reading not to exceed 0.2 watts.

9. If the above indications cannot be obtained, remove and replace the DST200 and DT470 PCB's from the rack assembly.

10. The Standby unit may be tested in like manner.

6289, p. 5-4

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Wiring, Transmitter Rack 6289, p. 5-9/5-10

6.1 GENERAL INFORMATION

6.1.1 Locomotive Equipment

SECTION VI SHOP MAINTENANCE


The LSR locomotive equipment has no periodic adjustments. There are adjustments provided on the Radio receiving equipment but these adjustments must be made at a proper test facility.

Provided on the DSR200 board are various indications and switches to aid in troubleshooting and application adjustment. See Figures 6-; and 6~2 for a listing of these indications and switches. Note the column listing switch positions for normal operation. SA is used to select the baud rate of the communications channel. The setting of this switch must be the same as the baud rate setting of the Transmitting unit DST200. SA position 4 is provided as a bench test aid to defeat an on board output interlock.

The SB switches are used to adjust and control the time out of the Station on and Brake control outputs. These two outputs are provided with independent time delay outputs which deenergize the corresponding output if another good message is not received within a time period after the receipt of a good message. The timeout period of the Brake channel is fixed at approximately 50 sec. The time out period of the Station on output is adjustable from 8 sec. to 48 sec. by utilizing SB section 1 thru 6 as indicated. SB sections 7 and 8 are utilized to enable continuous operation of these two timers for bench test purposes.

SC is provided to select the address a particular locomotive will respond to as shown. The LED indicators are provided to indicate when the system is energized, receiving messages, and the state of the controls in the received message.

6.1.2 Wayside Equipment

The LSR-500 office equipment requires no periodic adjustments; however, a number of switch selectable features and LED indicators have been provided to aid maintenance and troubleshooting.

Excluding adjustments on the radio transmsitter which should not normally be performed, all indications and selections are located on the DST200 board. These indications and switches are shown in Figure 6-3. Note the column indicating switch positions for normal operation. The LED indications are self-explanatory. SA is provided both in site and Test bench tests of the radio transmitter.

By keying the radio "on" continuously, output power and center frequency can be measured. The facility is also present to shift the radio high or low to measure the proper deviation. SB is provided to allow the selection of different transmission baud rates for various applications. The high repetition rate test feature is used in bench testing and troubleshooting the DST200. When replacing a DST200 assure. that SB configured the same on both original and replacement unit.

6289 p. 6-1


SA

4

SB

1

2

3

4

5

6

7

8

....

SC

>

SA

1

2 SB 3 1

4 2

SWITCHES 3

4

SC 5

1 6.

2 7

3 8 DSR 200 4

018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 0 0 0 0 0 0 0 0 0 0 0 0 0 O· 0 0

SWITCHES

Normal Operation

One and only one in closed position as per application, other two are Off/Open.

Off/Open

Normal Operation

FUNCTION

Bit rate select & interlock enable

Close for. 2400 BPS

Close for 1200 BPS

Close for 600 BPS

Close to disable station on/brake release interlock of other outputs

Station on output time delay & station on/brake release test · selections

Close for 8 second station on time delay


One and only one in closed Close for 24 second station on time delay

position as per application. Close for 32 second station on time delay Other five are Off/Open.

Off/Open

Off/Open

Normal Operation



Close to enable testing of station on time delay

Close to enable testing of brake release time delay

Locomotive Selection

1 "I Close to select Locomotive # 1

2 One and only one in closed Close to select Locomotive #2 position as per application,

3 other three are Off/Open. Close to select Locomotive #3

4) Close to select Locomotive #4

Figure 6-1. DSR-200 Switches

6289 p. 6..:.2

LED

UNION SWITCH & SIGNAL ffi SA

1

2 SB

3 1

4 2

3 SWITCHES

4

SC 5

1 6

2 7

3 8 DSR 200 4

018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

LED INDICATORS

INDICATOR ILLUMINATED FOR

018 Power On

019 ALA Energized

020 Radio Carrier Detect

021 Message Start

022 Message Error

023 Good Message

024 Station On Energized

025 Brake Release Energized

026 Hump Fast Energized

027 Hump Slow Energized

028 Back Up Energized

029 Dead Slow Energized

030 Auto/Manual Energized

031 Auxiliary Energized

032 Flasher Energized

033 Alarm Energized

Figure 6~2. DSR~200 Indications

6289 P• 6-3


001 SA

rn 002

Ooa SB -1 -2 ,___ 3

>--

4 >--

DST 200

LED INDICATORS

01 Illuminated for "Transmit Enable" (one or more locomotives has been selected)

02 Illuminated for "Power On"

03 Illuminated when radio transmitter is keyed

SWITCHES FUNCTION

SA Normal Operation Radio transmitter test switch

1 Off/Open Close to key transmitter continuously .

2 Off/Open Close to shift radio transmitter to highest frequency

3 Off/Open Close to shift radio transmitter to lowest frequency

SB Normal Operation Bit rate 2nd test selection switch

:} One and only one is in the Close for 2400 BPS closed position as per applica-tion. Other two are Off/Open. Close for 1200 BPS

Close for 600 BPS

4 Off/Open Close to enable high rep rate test operation

¥igure 6-3. DST-200 Switches and Indications

6289' p. 6-4

UNION SWITCH & SIGNAL ffi 6.2 DST200

This procedure contains information pertinent to the testing of a DST200 printed circuit board for proper ?peration.

6.2~ 1 Recommended Test Equipment

l. Hewlett-Packard Model 5005A Signature Multi~eter 2. +15 Vdc adjustable power supply 3. Test fixture TF2500006 4. Test leads 5. Oscilloscope 6. DST200 schematic (Figure 4-4)

6.2.2 Test Procedure Comments

Format for measured parameters will be as per the four examples given below:

1 •

Attribute/point Function Clock Start Stop

Norm. Signature Rising/TP3 Rising/TP5 Falling/TP2

Point

U7, pin 3 U7, pin 8 TP6

2. Function

3.

KHz

Point

TP3 TP5

Function

ms

Signature

Reading

U7HO HAPO CU57

2.4576 MHz 4800 Hz

Deviation

0.001% 0.1%

Start/point

Rising/TP7

Reading= 108.46 ms

Stop/point

Falling/TP2

6289 p. 6-5


4. Function Start/point Stop/point

TOTLZ Rising/TP7 Falling/TP2

Rea din~ Point

150 pin 11 , U21 163 TP5

6 TP4 45 pin 11,-u12

Carefully read the owner's manual before attempting to operate the signature multimeter, and applying this specifiction in conjunction with it.

In all switch tables, "X" will indicate that a switch is to be closed and"-" will indicate that a switch is to be open.

Visually inspect DST200 Board ·to assure that. all components are installed properly.

6.2:3 Test Set-Up

1. For this and all following tests attach multimeter OV probe to TP6.

2. Jumper TP6 to TP13 before applying power.

3. Set all switches to the open position.

4. Connect power supply +volt output to +Vdc input terminal of DST-200 and -volt output to OV de input terminal.

6.2.4 Test Procedure

1. With Multimeter set for DCV function, monitor voltage at TP11 as power supply voltage is increased from OV to +15Vdc.· ·voltage reading should be +5 Vdc +5%. Under no circumstances should the applied voltage be raised if the measured voltage rises to 6 Vdc.

2. Observe that 02 is illuminated.

3. Set all multimeter thresholds to 5V CMOS.

6289 p. 6-6


4. Using the signature multimeter, proceed with the following measurements:

Pin Pin

Function KHz

Point

TP3 1 O, U1 O 10, U10

Pin l O, U10 Pin 3, U10

Reading Deviation

2457.600 KHz +.100 76.800 KHz +.001 38.400 KHz +-.001 19.200 KHz +.001

307.200 KHz +.010

SB 1 2 3 4

x -x -- x - -- - x -- - x

5. Check for proper timing periods as shown below. Be sure SB-1 through 4 are set correctly.

Function Start Stop Readin~ SB 2 3 4

ms Rising/TP7 Rising/TP7 5439.9 +.1 ms x -ms Rising/TP7 Rising/TP7 106.70 +.01 ms x - - x ms Rising/TP7 Rising/TP7 213.40 +.1 ms - x - x ms Rising/TP7 Rising/TP7 426. 80 +.1 ms x x ms Rising/TP7 Falling/TP7 376 +.2-ms x - - x ms Rising/TP7 Falling/pin 11, U3 376 +.2 ms x - - x ms Rising/TP7 Falling/TP1 17.7-+.3 ms x - - x ms Rising/TP7 Falling/TP2 4.24 +.5 ms x - - x ms Falling/TP7 Falling/pin 14,U11 17. 916 +. 001 ms x - - x

6. Observe that D1 and D3 are flashing.

7. Using the TOTLZ counting function, set up the signature multimeter for the following:

Function

TOTLZ

Data Probe Point

pin 11, U21 pin 11, U12 pin 9, U12 pin 10, U12 pin 18, U20 pin 15, U11 pin 15, U20 pin 11, U1 pin 14, U1

Start/Point

Rising/TP7

Reading

39 39

5 160 169

5 5

137 137

Stop/Point

Falling/TP2

6289 p. 6-7


8. Connect Test Fixture TF2500006 to J2 and remove jumper from TP6 to TP13.

9. While performing Signature Analysis of the DST_-200, always leave Bit 1 of the frame being tested on while .turning on the other 7 bits one at a time and reading the signature. Bit 1 of the frames not being tested should be off.

Function Start/Point Clock/Point Stop/Point Reading/Point ------ ------ - - - - - - - - - - - ... - -Norm. Sign. Rising/TP7 Rising/TP10 Rising/TP2 TP7

Frame 1 Frame ·2 Frame 3 Frame 4 Signature Signature Signature Signature

Bit 1 542P cuoc 3191 U4C4 Bit 2 2171 CUF6 7611 51A6 Bit 3 6P81 CU6H 1251 A63H Bit 4 4979 CU38 2071 HHUO Bit 5 5A85 3U12 3961 P016 Bit 6 H37C 7007 C5P9 UPP5 Bit 7 1784 HUOH 73AH U19F Bit 8 75UC 8008 9080 U620

All bits asserted= P4A4

10. Open all input switches. Then repeatedly close and open any Bit 8 switch. 13 should flash each time the switch is either open or closed. 01 should remain off.

11. Upon completion of above tests adjust SB- as shown:

SB ·1 2. 3 4 x - - x

12. Jumper J1 pin 4 to J1 pin 3.

13. Utilizing the Analyzer in the Vdc mode, verify the voltage readings at J1 to be shown below as SA is varied as shown.

SA J1 -1 2 3 1 3 4 5 6 7 9 10

x +15 +15 +15 +15 ov +15 ov ov x x - +15 +15 +15 +15 ov +15 ov +15 x - x +15 +15 +15 ov ov +15 ov ov - - - NA +14 +14 NA ov +14 puls- ov NA

ing

pulsing

6289 p. 6-8

Z'-

'~

..


14. Upon completion of above tests, set all switches as shown below.

SA 2 3

6.3 DSR200

SB 1 2 3 4 - - x -

This procedure contains information pertinent to testing a DSR200 printed circuit board for proper operation.


1. Hewlett-Packard Model 5005! Signature Multimeter 2. +15 Vdc adjustable power supply 3. Test fixture TF2500006 4. Test fixture TF2500005 5. A lmown good DST200 PCB 6. Test leads 7. Oscilloscope 8. DSR200 schematic D2500005 (Figure 4-10) 9. A lmown good DI-100 PCB 10. +24 Vdc adjustable power supply


Format for signatures will be as per the four examples given below:

Function

Morm. Signature

Point


Attribute/point Clock Start

Rising/TP3

Signature

U7HO HAPO CU57

Rising/TP5

2. Function

3.

KHz

Point

TP3 TP5

Function

ms

Reading

2.4576 MHz 4800 Hz

Reading= -108.46 ms

Deviation

0.001% 0.1%

Start/point

Rising/TP7

Stop

Falling/TP2

Stop/point

Falling/TP2

6289 p. 6-9


4. Function Start/point Stop/point - - - - ------ - - - - - ------ - - - - -

TOTLZ Rising/TP7 Falling/TP2

Readin13 Point

150 pin 11 , U21 163 TP5

6 TP4 45 pin 11, U12

Carefully read the owner's manual before attempting to operate the signature multimeter, and applying this specifiction in conjunction with it.

In all switch tables, "X" will indicate that a switch is to be closed and"-" will.indicate that a switch is to be open.

Visually inspect DST200 Board to assure that.all components are installed properly.

6.3.3 Test Set-Up

1. For th~s and all following tests attach multimeter. OV probe to terminal marked O.V.

2. Attach +V-probe of multimeter to +5 volt terminal.

3. · Set all switches to the open position.

4. Connect +12 Vdc power supply +volt output to +12-input terminal of DST-200 and -volt output to OV de input terminal.


1. With Multimeter set for DCV function, monitor voltage as power supply voltage is increased from OV to +12Vdc. Voltage reading should be +5 Vdc +5%. Under no circumstances should the applied voltage be raised if the measured voltage rises to 6 Vdc.

2. Observe that D18 is illuminated.

3. Set all multimeter thresholds to 5V CMOS.

6289 p. 6-10

.->'


4. Using the KHz function on the signature multimeter, proceed with the following measurements:

SA Function Point Reading 1 2 3 4

KHz TP8 24.57.6 KHz x -KHz pin 1 o, U13 76.8 + ? KHz x -KHz pin 1 o, U13 38.4 + ? KHz - x KHz pin 1 o, U13 19.2 + ? KHz - - x -

SB Function Point Reading 1 2 3 4 5

KHz pin 1 o, U34 1.024 KHz+ .205 KHz x - -KHz pin 1 o, U34 ·.512 KHz+ .102 KHz x - - -KHz pin 1 o, U34 .341 KHz+ .068 KHz x - -KHz pin 1 o, U34 .256 KHz+ .051.KHz - - - x -KHz pin 1 o, U34 .205 KHz + ·.041 KHz - - - - x KHz pin 1 o, U34 .171 KHz+ .034 KHz - - -KHz pin 1 o, U27 .164 KHz+ .033 KHz x - - -

5. Using the "ms" function and the following set ups, verify the time measurements listed below.

1 2 x -

SA 3 -4 5

Function

6 7 8 - x x

Start/point Stop/point

6

-----x

ms ms

falling/TP10 falling/TP11

Rising/TP10 5000 ms +20% Rising/TP11 . 8000 ms +20%

6. Attach Test Fixture TP2500006 to DST200 J1 and DSR200 J1.

A. Set SB on the DST200 as shown below:

SB 1 2 3 4 x - - -

B. Set SA and SC on the DSR200 as shown below:

SA SC 1 2 3 4 1 2 3 4 x - - - x - - -

7

x x x x x x x

6289 p. 6-11

8

x x x x x x x·

UNION SWITCH & SIGNAL.

C. Assert bit 1 and bit 2 frame 1 on Test Fixture.

D. Observe that D20, D21, D22 and D23 are flashing.

Function Start/point Stop point Reading

ms falling/pin 7, U15 falling/pin 7, U15

Rising/pin 9, U21 Rising/pin 3, U37

.220 ms + 20ms 1.0 ms +-20ms

Assert the second to the last bit (Bit 7) (Frame 1) to read the reading on TP12-and remove Bit 7 to take reading on TP3.

Function Start/point

Rising/TP 12 Rising/TP13

ms

7. Using the following set up and pulse counts listed below.


TOTLZ Rising/pin 7, U20 TOTLZ Rising/pin 7, U20 TOTLZ Rising/pin 7, U20 TOTLZ Rising/pin 7, U20 TOTLZ Rising/pin 7, U20 TOTLZ Rising/pin 7, U20

Stop point

falling/TP12 falling/TP13

the "TOLTZ" function,

Stop/poin't

Rising/pin 7, U20 Rising/pin 7, U20 Rising/pin 7, U20 Rising/pin 7, U20 Rising/pin 7, U20 Rising/pin 7, U20

Reading

500 ms + 100% 1000 ms-+ 200%

verify the various

Point Reading

TP9 184 pin 14, U25 5 pin 1, U25 80 pin 11, U14 4 pin 1, U18 1 pin 15, U18 3

8. Obtain and verify signatures as given in the table shown below.

Assert,the f~rst two bits· in frame one, be sure the switches are set up for the following on the DSR200.

SA 1 2 3 4 x - - -and on the DST200;

SA SB 1 2 3 1 2 3 - - - x

Function Clock/point

Qual. sig. falling/TP9

628 9 p. 6-1 2 .

SB 1 2 3 4 5 6 7 8 x - x x

4 x

~tart/point

SC 1 2 3 4 x - - -

Stop/point

rising/pin 7, 020 rising/pin 7, 020

.Qual/point

High/TP7

J'

Point/reading

pin 11, U32/A21P pin 9, 024/lOOC pin 4, 024/2F51 pin 2, 024/90CH pin 13, 024/1014 pin 11, 024/1235 pin 3, 022/6253 pin 6, 012/26AH pin 1 , 032/588H TP6/2780 pin 2, 033/FC35 pin 10, 033/77AF pin -2, 040/2AH4 pin 10, 040/9F20 pin 10, 010/732F pin 15, 018/83HC pin 15, U11/2780 pin 3, 019/A454 pin 7, 015/2CF5 pin 9, 015/P8AF pin 12, 019/4P6H pin 15, 025/2CA1

Point/reading

pin 10, 032/70A3 pin 3·, 024/0356 pin 5, 02417250 pin ·15, 024/14H5 pin 12, 024/9A04 pin 3, 030/93HO pin 9, 021/2CF5 pin 4, 01-2/84C3 pin 2, 032/8530 pin 11, U14/FHC6 pin 7, 033/U8P1 pin 15, 033/1203 pin 7, U40/3C57 pin 11 , U1 0/7F57

.pin 10, U17/QU7C pin 14, U18/5P66 Pin 14, 011/UA32 .Pin 1, 018/93HO pin 10, 015/3511 pin 3, U10/495H pin 11, 019/93HO


9. Verify the LED indicators as per Table 1. All transmitter bit switches not specified to be on should be kept off.

10. With a known good DI-100 Board, connect B24 & C24 from the DSR-200 to B24 & C24 respectively to the DI-100 card.

11. Connect the 52-pin connector (from the DSR/DI-100 Test Box) marked "DSR--200" to :J1 of the DI-100 to J2 of the DSR_-200. Connect the 52 piri connector (from the DSR/DI100 Test Box) marked "DI-100" to J1 of the DI-100.

12. Follow this set-up for DSR~200:

SA 1 2 3 4 x - - -

SB 1 2 3 4 5 6 7 8 x - - - - - x x

SC 1 2 3 4 x - - -

13. With all switches off on the DST Test Box, observe the foilowing conditions on the DSR/DI-100 Test Panel:

a. Any bit set or cleared in this procedure should cause the alarm light to light for a hal~ secqnd, and then remain off.

b. With first bit set and left on during this procedure, the "Stop" Light should be lit.

c. With the second bit set and left on during this procedure, the "Brake Apply" light should be lit.

6289 P• 6-13


I I

I '

Table 1. DSR-200 LED Indicators

Bit Sets LED's Illuminated SC Message 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30 31 32 33 1 2 3

1 x x - - - - - - x x - - - - - - - p x - -2 - - - - - - - - x x - - - - - - - - x x -2 - - - - - - - - - - - - - - - - - p - x -2 x x - - - - - - x x - - - - - - - p - x -

3 - - - - - - - - x x - - - - - - - - - x x 3 - - - - - - - - - - - - - - - - - p - - x 3 x x - - - - - - x x - - - - - - - p - - x

4 - - - - - - - - x x - - - - - - - - - - x 4 - - - - - - - - - - - - - - - - - p - - -4 x x - - - - - - x x - - - - - - - p - - -

4 x x x x x x x x ! x x x x x x x x F pl - - -I I •

X = LED illuminated "-"=LED dark F = LED flashing p = Pulsed on

d. With Bit 3 applied the "Hump Fast" and "Brake Apply" light should be lit. Clear Bit 3.

e. With Bit 4 set, observe the "Hump Slow" light and "Brake Apply" light should be lit. Clear Bit 4.

f. With Bit 5 set, observe the "Back Up" Light and "Brake Apply" light should be lit. Clear Bit 5.

g. With Bit 6 set, observe the "Dead Slow" Light and "Brake Apply" light should be lit. Clear Bit 6.

h. With Bit 7 set, observe the "Stop", "Auto Manual", and."Brake Apply" lights should be lit. Also the "A" and the "Flasher" lights should be flashing at approximately a 1 second rate. Set the "ALA" switch to the ON position. The "A" light should be lit and "Flasher" light should be dark. Clear Bit 7.

i. With Bit 8 set, the "Aux", "Stop", and "Brake Apply" lights should be lit. Clear Bit 8.

6289 p. 6-14

41 ! I

I

=I -i

! - ' I i

-! -' -j

' X. X: x

x

..

,.

UNION SWITCH & SIGNAL • m j. With Bits 1 & 2 still set, use the table below to check the resistor

tree on the DSR-200. Place the ohmmeter common Lead to terminal post and the positive Lead to terminal post 3, for first' reading only. For 2nd through 16th reading, the positive Lead, should be moved to terminal post 2. Ohmmeter should be set for 200K ohm scale.

Bit Reading in 3 4 5 6 K ohms

1 o. 00 + 1%* - - - x -24.90 +1%

- x - 19.10 +1% x x 15.00 +1%

- x 12~10 +1% - x - x 10.00 +1% - x x - 8.25 +1% - x x x 6.98 +1% x - 5.90+1% x - - x 4.99 +1% x - x - 4.22 +1% x - x x 3.57 +1% x x 3.01 +1% x x x 2.49 +1% x x x - 1.65 +1%" x x x x 1.00 +1%

(X) = SET - (-) CLEAR

*Ohmmeter reading should be between terminal posts 1 & 3. All other readings should be between terminal posts 1 & 2.

14. Upon completion of above tests, set all switches as shown below:

SA 1 2 3 4 - - x -

1 2 3 - x -

SB 4 5 6 7 8

SC 1 2 3 x -

4

6.4 DSR-200 POWER SUPPLY

The following is a guide to troubleshooting of the power supply circuitry. The procedures outlined permit bench testing of the power supply to verify proper operation as to assist in replacement of any malfunctioning circuit component.


1. DC ammeter with 0-3 ampere range 2. DC voltmeter with 0-10, 0-50 aria 0-100 volt nominal ranges. 3. Oscilloscope with external trigger and 5 MHz frequency response. 4. DC power supply, 50 to 90 volts variable with 1 ampere minimum supply

capability.

6289 p. 6-.15·


Output loads for power supply:

1. 24 volt output - variable resistor 5-50 ohms, 100 watt rating. 2. The DSR-200 electronics circuits serve as the 5 and 12 volt load~. 3. A 400 ohm 10 watt resistor is also required.

6.4.2 Test Procedure Cao.ments

A properly functioning supply will yield the following electrical values. If these readings cannot be obtained, the problems may be due to the power supply circuitry or due to excessive current loading by othe~ DSR-200 circuitry.

6.4.3 Test Set-Up

Connect the DSR-200 B64 terminal to the variable power supply positive lead through the ammeter and C64 to the negative lead. - Preset the variable resistor 25 ohms and connect to the B24 and -24 terminals. Connect the 400 ohm resistor between the· B64 and the +R terminals.


1. Adjust the power supply to 72-volts. Measure 24 volts output+ 5% at the B24 and .:24 volt terminals. At 72 volts input, the current reading should be .70 amperes+ 10%. Adjust the variable resistor to 12-ohms and repeat. The 24 volt reading should be obtained at an input current reading of 1.0 amperes.:!:.. 10%.

2~ Vary the power supply from 60 to 90 volts and observe that the reading obtained in step 1 above does not vary by more that+/- 5% over this range.

3. Measure the output voltage between the +12 Reg. terminal and the O volt common terminal. This reading should be 1"2 volts + 5%. Measure the voltage between the +5 volt terminal and the O volt terminal. This reading should be 5 volts.:!:.. 5%.

4. Circuit Voltage Readings

Circuit Point

Diode D9

U2, pin 10 C64 ground ref.

U3, pin 2 C6 4 ground ref.

Q2, drain terminal C64 ground ref.

6289 p. 6-16

Voltage Reading,+ 10%

15 volts DC

25 KHz square wave at 15 volt amplitude



UNION SWITCH & SIGNAL ffi (Circuit voltage readings con't.)

U1, pin 13 and 16 -24 volt ground ref. trigger on U1, pin 10

20 KHz square wave pins 13 and 16 waveforms are out of phase ~y 180 degrees

Node of C16 and C19 C64 ground ref.

Node of F1 and source of Q3, C64 ground ref.

36 volts de

36 volts de

Node of R26, 27 and 28 5~2-volts de · -24 volt term. ref.

Node of R27 and 29 · -24 volt term. ref.

Node of C20 and DB

0~2-volts de with 12~5 ohm load

18 volts de+/- 20%

6.4.5 Power Supply Troubleshooting Aids

Specific Problem Noted Probable Cause

No 5 volt output, otherwise OK Check current loading of logic circuitry. Check and replace VR3

. if indicated.

No 5 or 12 volt output, otherwise OK "Check VR3 and U6 and replace if indicated.

No 24 volt output Check and replace U3 if indicated.

No output Check fuses F1 and F2-and replace. If fuses are OK, troubleshoot the pre inverter and inverter control

6~5 DI-100

This procedure contains information pertinent to the testing of. a DI-100 printed circuit for proper operation.


1. Hewlett-Packard Model 5005A Signature Multimeter 2~ +24 Vdc adjustable power supply 3. Test fixture TF2500006 4. Test fixture TF2500005 5. A-known good DST-200 P.C. Board

6289 p. 6-17


6. A known good DSR-200 P.C. Board 7. Test leads 8. DI-100 PCB Schematic (Figure 4-13) 9. Oscilloscope


Format for signatures will be per the four examples given below:

Attribute/point

Function Clock Start

Norm. Signature Rising/TP3 Rising/TP5

Point


2. Function

3.

4.

KHz

.Point

TP3 TP5

Function

ms

Reading

Function

=

- - - - -TOTLZ

Reading

150 163

6 45

Signature

U7HO HAPO CU57

Reading

2.4576 MHz 4800 Hz

108.46 ms

- - - - -

Point

Deviation

0.001% 0.1%

Start/point

Rising/TP7

Start/point ------ - - - - -Rising/TP7

pin 11 , U21 TP5 TP4 pin 11, U12


Stop

Falling/TP2

Stop/point

Falling/TP2

Stop/point ------ - - - - -Falling/TP2

1. With a test lead, hook the+ output of the +24 volt power supply to the terminal on DI-100 marked "B24". With the test lead, hook the O volt output of the +24 volt power supply to the terminal marked "C24".

6289 p. 6-18


2. Slowly raise input voltage on the 24 volt terminals while observing the voltage drop across 02. Cathode side of diode will have positive voltage on it. At no time should voltage be allowed to rise above 16 volts across D2~ Once voltage has reached·approximately 15 volts, observe the input while bringing voltage on supply to 24 volts.

3. Set all threshold levels to 5 volts CMOS on the signature multimeter. Now proceed to se~ the threshold adjust to 12 volts for the clock, qualifiers and data "High" level. Set the data "Low" level to 3 volts.

4. Using the following set up, verify the readings below.

Function

KHz

Point Reading Deviation

pin 12, U5 1.00 KHz +.10 KHz

On the DSR/DI-100 test panel, set the intensity switch to 50% intensity and take the first reading given below. Now set the intensity switch to 75% intensity and take the second reading given below.


ms Rising pin f 2, U5

50% intensity

Reading= .054 ms .:t.•005 ms

75% intensity

Reading= .027 ms .:t.•0027 ms

Stop/point

Falling/pin 10, U5

With Bits 1, 2 and 7 set on the DST test set, observe that the "ALA" switch on the DSR/DI-100 is set on ("A" and "Flasher" lights are not flashing) and also observe that "Brake Apply", "Auto/Manual", and "Stop" lights are on.

5. Using Table 2, observe that the proper segment-lights are lit.

Note that in this procedure, only bits 1, 2 and 7 are set.

6. With all above procedures tested, remove test connector J2 and test clips on B24 and C24. Remove signature multimeter probes, and tests are complete.

6289 P• 6-19


Table 2. Segment Lights

3 4 5 6 A B c D E F G p.P. A B c D E F G A B c D E F G - - - - - - - - - - - - - - - - - - - - - - -- - -- - - x - x x - - - - ~,. x x x X. X x - x x x x .... x x -- - x - - x x - - - - x x x - x x - x x - x x - x x - - x x - x x - - - - x x - x x - x x x x x x x x -- x - - - x x - - - - x x x x - - - - x - x x - x x - x - x x x - x x - x x x x x x x x - x x x x x x -- x x - x x - x x - x x x x - x x - x x - x x - x x - x x x x x - x x - x x x - x x - x x x x x x x x -x - - - x x - x x - x x x x x - - - - x - x x - x x I x - - x x x x x - - x x x x x x x x - x x x x x x -x - x - x x x x - - x x x x - x x - x x - x x - x x x - x x x x x x - - x x x - x x - x x x x x x x x -x x x x x x x x ' x x x x x x - - - - i - - - - -- x x i x x - x - x x - - x x x x x x x x x - x x x x x x - i

x x x - - x x - - x x x x - x x - x x x x x x x x -x x x x x - x x - x x x x x x x x x - x x x x x x -

I ' !

Set= X Light Off = -Clear= - Light On = x

'

6.6 UC450 CONVERTER ALIGNMENT

6.6.1 Recommended Equipment

1. 12 volt DC power source@ 60 ma.

2. DC voltmeter 0-10 Vdc

3. Spectrum analyzer or RF voltmeter, 50 ohms input impedance and +10 DBM input range.

6289 p. 6-20

..

:


4. Signal generator with calibrated amplitude, and 450-470 MHz raage at 50 ohm input impedance

5. Frequency counter with 500 MHz range, -20 DBM sensitivity and 50 ohm

6. impedance

7. Alignment tools for variable capacitors and inductors

6.6.2 Procedure

1. Connect the signal generator to the RF input at J3. Set the frequency to' the UC450 operating frequency. If the frequency is not known, this may be determined by examining the nomenclature on the crystal case top. The operating frequency is marked by the frequency in MHz followed by Rand the frequency in KHz.

2. Set the generator level to -30 DBM.

3. Connect the spectrum analyzer (or RF voltmeter) to J2:

4. Apply 12 volt power to the UC450 via the red power lead with the top foil of the circuit card as the power ground reference.

5. With the voltmeter connected to TP2 with the circuit card foil as ground reference, adjust L12-for maximum reading per test point table.

6. Connect the voltmeter+ lead to TP3 and adjust L12 and L13 for maximum reading per Table 3. ·

1. Adjust C35 and C37 for a peak reading on the analyzer. A reading of+ 4 to + 8 DBM should be observed.

8. Connect the frequency counter to J2 and adjust C17 to the local output frequency+/- 100 Hz.

9. Disconnect the counter from J2-and connect the analyzer to J1. Set the analyzer frequency to 72.14 MHz. Adjust C11, CS, C5 and C2 for a peak reading at this frequency. With a -30 DBM input signal, an output reading of ~25 to -20 DBM should be observed at J1. Readjust C11, CS, C5 and C2 if required to obtain this reading.

6289 p. 6-21


Table 3 Test Point Readings

The following readings are..:!:. 10%.

Test Point No. Description Value "·~=-1-,

1 Temperature compensation output 5.7 Vdc -2 Q1 emitter current reference 1 .4 Vdc

3 Q8 emitter current reference 1.-2 Vdc - Node of L5 and R6 0.33 Vdc

(Q2 source current reference) - Node of L3 and R2 0.33 Vdc

(Q1 source current reference) - Node of C1 and C15 8 Volts de

-(Voltage regulator output) Note: This reading should be to a +5% tolerance

6.7 DT-470 ALIGNMENT


1) Variable DC power source capable of 0-16 volt adjustment range and 350 milliamperes maximum current.

2) Frequency counter with accuracy of 0.25 ppm or better and frequency range of 550 MHz at an input sensitivity of -20 dbm (70 millivolts at 50 ohms).

3) DC milliampmeter 0-250 ma. with full scale accuracy of..:!:. 2% •

. 4) Spectrum analyzer with suggested frequency range of .001 to 1.8 GHz with adjustable sweep band with, resolution and sensitivity. (Tektronix 7L12~ 7L13, 7L14 or equivalent).

5) DC voltmeter with 0-2-and 0-20 volt ranges and .:!:.·2% full scale accuracy.

6) RF wattmeter with full scale accuracy of..:!:. 2% full scale range of 2.5 watts, thru line type.

7) RF attenuator with 20. db loss factor, 50 ohms.

8) Appropriate 50 ohm cables and fittings. The DT470 RD output connector, P2, is a SMB type fitting.

9) Tuning tool for variable inductors L1 through L5, Micrometals type.

10) Tuning tool for variable capacitors C6, and C41 through C53.

11) 10 pin connector wired as indicated. Vectran part no. VM560800-02~

6289 p. 6-22

'

,,


6.7.2 Procedure

Figure 6-4 provides a layout of the tuning adjustment locations on the DT470 card. Make the cable interconnections as shown in Figure 6-5. The following sequence of adjustments should be followed. Steps 1 through 14 adjust the RF tuning for RF output and minimum spurious response.

1. Apply +15 volts de to the DT470 cards. Make the following DC voltage measurements:

TP1 TP2 TP3

5. 0 - 5.5 Vdc 0.8 Vdc minimum 0.3 Vdc minimum

Note: TPS is the 6 volt reference point for voltage measurements.

2. Connect the voltmeter to TP2. Alternately adjust L1 and.L2 for a peak reading. A reading of 1.3 to 1.6 volts should be obtained.

3. Connect the voltmeter to TP3. Alternately adjust L3 and L4 for a peak reading of o.8 to 1.4 v:olts.

4. Connect the voltmeter to TP4. Alternately adjust L5, C41, C42.and C43 for a peak reading of 1.8 to 2.5 volts.

5. Adjust the spectrum analyzer to the transmitter output frequency fo. Suggested readings are sweep range 5 MHz, resolation 100 KHz. A low level RF.output should be observed at fo-. Adjust L5, C41, C42, C47 and C49 for a maximum reading.

6. Adjust the spectrum analyzer center frequency to fo/3. Adjust C44 for a null (minimum) reading.

7. Tune the spectrum analyzer to fo/2 and adjust C45 for a null reading. Repeat steps 5, 6 and 7.

8. Adjust C48 and C49 for a maximum indication on the milliampmeter. A reading of from 50 to-250 ma should be observed for the initial adjustment.

g. Adjust C51 for a minimum current reading. An RF.power reading should be observed on the wattmeter.

10. Adjust C52-for a 1.0 watt power level.

11. Adjust C53 for a maximum RF output.

12·. Readjust C52 for 1.0 watt ou~put and observe approximately 150 ma milliammeter reading.

13. Alternately adjust C50 and C51 for a current null. Readjust C52 and C53 for 1.0 watt output. A reading of 135-150 ma should be obtained. Repeat steps 5.through 13.

6289 p. 6-23

0\ I\) co I.O

'O • 0\ I, I\) -i=

t-:tj .....

~ CD

0\

•· -i= • t;j ~ ~ -.:i 0

§ ..... ~ tJ:>, 0.. ~

6i [ CD

~ t"" 0 (.)

~ ..... g fll

DT470 051

L/

~ ~a u~ 2500145 cw ..J REV A C43

~ a OcG7P1 ·RP1 c l oi) u1 1 1• Fe. :

C49

e C48

C4"

C52.

TP4 R1

a ~ n, 1 033 I , R23 I l R ~ - j

~~o . eC43 till m• fa •

~o-08• C42 C41

·~ Tuning Adjustment Locat

' ~ ·tons

T-P5

C53 .P2

I R17 J QOP2 ,.... -15

r'

EB c z 6 z I ~ :c RI (I)

Gl z )> r


(a) (d)

VARIABLE POWE8 SPECTRUM SUPPLY ANALYZER

+ 9 )

I AF "T" (b)

I I

I I FREQUENCY - MILLI· + l J COUNTER AMMETER

(c)

(f) AF - ~ - ATTENUATOR

""""T ,

I I I I I I

NC I I I I I (e)

1 I 21 3 I 4 I s I s I 1 I a I 9 I 10 WATT METER

P·1

DT470 P2 AF OUTPUT

PAINTED SMB CIRCUIT FITTING

CARD -- - - - - INDICATES JUMPE A

Figure 6-5. DTij?O Test Set Interconnection Diagrams 6289 p. 6-25


Steps 14 through 17 provide the frequency and deviation adjustments

14. Observe the frequency reading on the counter. Adjust C6 for the proper frequency fo .:!:. 100 Hz.

15. Disconnect the jumper between pin 5 and pin 4. Adjust the frequency deviation pot R26 to give a reading of fo -4 KHz.:!:. 100 Hz.

16. Reconnect the jumper between pins 4 and 5 and set the frequency to fo + 100 Hz. Alternately repeat steps 15 and 16 until the frequency is fo - (4000 Hz.:!:. 100 Hz) with pins·4 and 5 connected.

17. Connect both pins 5 and 10 to pin 4. The frequency should shift upward to , fo + (4000 Hz.:!:. 400 Hz). This completes alignment of the transmitter.

6.7.3 Troubleshooting Aids

The approximate gain distribution of the DT470 is shown below.

Stage Output Frequency

Oscillator Q4 4 fo Doubler Q5 8 fo Amplifier Q6 8 fo Tripler Q7 24 fo Amplifier Q8 24 fo

Test Point Data is given below:

Test Point

TP1 TP1 TP1 TP2 TP3 TP4 TP5

Description

Modulation Signal,.fo Modulation Signal, fo - f Modulation Signal, fo + f Q5 emitter current Q6 emitter current Q6 emitter current ground reference (OV)

6.7.4 Output Current

Output Level, dbm

+ 1 + 8 +16 +20 +30 (1 watt)

Voltage Range

5-5.5 Vdc 6-6.5 Vdc 4-4.5 Vdc 1.2-1.7 Vdc 0.9-1.3 Vdc 1.7-2.5 Vdc

Indicated Current

7-9 ma 7-9 ma 7-9 ma

To obtain final output current, the following procedure must be used. The connector P1 power lead furnishes current to both Q7 and Q8.

1. measure the current flow through plug P-1, pin 1.

2. calculate the Q7 current as follows.

Q7 current= Test point 4 voltage+ 10 ma 135

3. Q8 current= current measured in (1) - Q7 current

6289 p. 6-26


Test conditions

1. +V = 15 volts de

2. transmitter output set to 1.0 watt per tuning procedure

6.7.5 Component Functions

The following is a list of components and their functions.

OSCILLATOR CIRCUIT

D1 C7 C6 C10 Y1 ca, cg R12 R13,R14 Q4 L1-C13 L2.:.c16, C17 C14 C11, C12

MULTIPLIER CIRCUIT

Q5 815, R16 R17 R18 C20-C21 L3=-c1a L4-C25, C26 C19 C15

AMPLIFIER CIRCUIT

Q6 819, 820 821 822 L5-C30, C31 C27, c28 C24

modulation and temperature compensation frequency determination and temperature compensation frequency adjustment coupling capacitor frequency determining element oscillator feedback network emitter resistor base bias network active element 4 fo bandpass filter 4 fo bandpass filter coupling element bypass capacitor

active doubler base bias network emitter resistor decoupling resistor bypass capacitors 8 fo bandpass filter 8 fo bandpass filter coupling capacitor emitter bypass

amplifing element base bias network emitter resistor decoupling resistor 8 fo tuned circuit and impedance matching network decoupling capacitors emitter bypass

6289 p •. 6-27


TRIPLER CIRCUIT

Q7 C4i , C42, L6 C43, L7 L8-L9 R27 R23, R24 C32~ C32 L13, L14 L15 C34 L10-C44 L11-C45 L12~ C46-C47

6.8 DR 150C

active element base impedance matching 24 fo idler circuit base return choke base return choke emitter resistors emitter bypass capacitors collector choke circuit decoupling collector bypass 8 fo trap network 16 fo trap network low pass filter and matching at fo


1) 12 volt de power supply 2) Frequency Counter 3) RF Signal Generator 4) Voltmeter 5) Oscilloscope 6) Spectrum Analyzer

6.8.-2 Test Procedure Comments

The DR150C receiver is provided on a single circuit card. It is normally mounted in a plug-in type assembly for insertion into the VR10 receiver card file. This plug-in assembly is designated DRM, Part No. VM2500. The receiver should normally be removed from this assembly for servicing. Test point readings may be taken and adjustment of the variable resistors and frequency setting capacitor C8 may be accomplished with the DR-150C mounted in the DRM carrier. The receiver must be removed from the DRM carrier for alignment. This requires removal of 8 retaining screws.

6.8.3 Local Oscillator Frequency Adjustment

1) Remove the DRM top-plate if receiver is mounted in the DRM unit.

2) Apply+ and - 12-volt de power to unit

3) Connect a frequency counter to Test Point TP7

4) Adjust variable capacitor C87 to the carrier frequency minus the I.F. frequency, i.e., to Fe - 10.700 MHz, to a tolerance of plus or minus 50 Hz

5) If a reading cannot qe obtained, refer to Section 6.8.7.

6289 p. 6-28


6.8.4 Carrier Detect Adjustment

1) Apply receiver power

2) Connect a RF signal generator to J1, the receiver input terminal

3) Set the signal gene~ator frequency to the assigned carrier frequency, Fe, plus or minus 200 Hz.

r

4) Set the signal generator amplitude to -107 DBM which represents a signal level of approximately 1.0 microvolt. The generator carrier should be unmodulated.

5) Measure the de level at the carrier detect output terminal (#4), or at TP10. The reading should be -1.0 volts de, plus or minus .10 volts.

6) Adjust R52 if necessary to obtain this reading.

NOTE

This procedure provides maximum received sensitivity. If it is desirable to limit the range of the transmitter, refer to Section 6.8~4.

6.8.5 Range Limiting

R52.may also be used as a range limiting adjustment. This adjustment is normally accomplished in the final system installation. The R52 setting

· effectively limits the range by controlling the output carrier detect signal. To limit the received range, position the portable transmitter at the maximum distance from the receiver antenna that is wanted. Con~inually key the transmitter. Adjust R52 until. a -1.0 volt de reading is obtained at the carrier detect output terminal. (An extender card will facilitate this procedure.)

6.8.6 Data Channel Adjustments

1) Repeat steps (1) to (3) of Section 6.8.4 above.

2) Set the signal generator to a -90 DBM level. Modulate the generator with a 1 KHz sine wave at a frequency deviation of plus and minus 4 KHz.

3) Connect an oscilloscope to the data output terminal or to Test Point TP13. Observe an amplitude of 6 volts peak (plus or minus 3 volts peak-to-peak). Adjust R51 as required to obtain this reading.

4) Set the generator to an unmodulated carrier output.

5) Observe O volts de plus or minus .5 volts de. Adjust R50 as required to obtain this reading.

6289 P• 6-29


6.8.7 Local Oscillator Alignment

1) Remove card from DRM carrier.

2) Apply power to the DR-150C circuit card.

3) Connect a spectrum analyzer to TP7 with TP3 as a ground reference.

4) Observe a reading of plus 5 DBM, plus or minus 3 DBM at the L.O. frequency of Fe - 10.7 MHz.

5) If this reading cannot be obtained, peak variable inductors L1, L2, L3 and L4. If this reading cannot be obtained, check emitter t

currents of Q2-(at juncture of Q2-and R11) and Q1 at TP1. Refer to Section 6.8.11 for proper voltage levels.

6) Adjust L.O. frequency per Section 6.8.3.

6.8.8 R.F. Amplifier and Mixer Alignment

1) Repeat Section 6.8.4, steps (1), (2) and (3).

2) Set signal generator level to -40 DBM.

3) Connect a spectrum analyzer to TP5. Set analyzer frequency to 10.700 MHz. The observed-signal level at TP6 should be -31 DB plus or minus 3 DB.

4) If this reading cannot be obtained, it will be necessary to readjust variable inductors L5, L6, L7, L8, L9 and L10.

5) If this reading cannot be obtained after realignment, connect the spectrum. analyzer to TP4 and set the analyzer frequency to Fe. The observed signal level at TP4 should be -24 DB plus or minus 3 DB. If this reading is obtained and the L~O., output at TP2 is at the proper level, a defective mixer, U8 is indicated. If this reading cannot be obtained, check the voltage level at the juncture of R23 and C34. The proper value should be· .35 volts DC plus or minus .15 volts. If this reading cannot be obtained, replace Q3. Check for the identi.,cal voltage reading at the juncture of C47 and R27. Replace Q4 if this voltage is out of specification.

6.8.9 I.F. Amplifier.Alignment

1) P~~or to proceeding, verify that the L.O. and RF amplifier/mixer circuits are operating correctly in accordance with the procedures outlined above.

2) Repeat Section 6.8.4, Steps (1) through (3).

3) Set the signal generator to a -107 DB level and modulate with 1 KHz sine wave at+ and - 4 KHZ FM deivation.

6289 p. 6-30

I

UNION SWITCH & SIGNAL ffi 4) Connect an oscilloscope to TP8.

5) Adjust variable inductors L11, L12~ L13 and L14 for a peak reading at TP8. Once a peak reading has been obtained, readjust each of these four variable inductors slightly f'or minimum ripple content on the observed waveform at TP8. The voltage reading obtained should be .6 volts de plus or minus .15 volts.

6) If the above readings cannot be obtained, measure the voltage at the juncture of ~52 and R29. If it is not .35 volts+ .15 volts, replace Q5. Check the voltage at the juncture of C55-and R32~ This voltage should be .75 + .25 volts. If the reading is out of this tolerance, replace Q6.-

6.8.10 Limiter Detector Alignment

1) Repeat Section 6.8.4, steps (1) through (3).

2) Verify that L.O., RF/mixer and I.F. circuitry is operating properly.

3) Set signal generator to -90 DBM with a modulating signal of 1 KHz sine wave at plus or minus 4 KHz FM deviation.

4) Connect an oscilloscope to TP7.

5) Observe a demodulated sine wave signal with amplitude of .9 volts peak-to-peak, plus or minus 25%. The signal should be 6 volts de plus or minus 1 volt.

6) Adjust variable inductors L15 and L16 as required to obtain the specified reading. If no output can be achieved, replace U7.

7) After proper reading has been obtained at TP7, readjust ~11, L12~ L13 and L14 for minimum observed distortion on the waveform. Repeat step (6) above, tuning L15 and L16 for minimum distortion.

NOTE

When tuning any of the variable inductors, it may be necessary to first remove the sealing compound that had been applied to the protruding inductor tuning slug. Failure to remove this compound may result in breakage of the slug. After alignment, the slugs should be resealed.

6289 P• 6-31


6.8.11 Test Point Readings

TP fl

1

2

3

4

5

6

7

8

Description

Q1 emitter current indication

L.O. signal output to.U8

Test point ground reference

RF amplifier output signal

U8 signal output

U7 reference voltage

Demodulated signal

Carrier detect signal

9 Not used

10 Carrier detect output

11 Amplified carrier detect

12 Not used

13 Data output signal

6289 p. 6-32

Reading

1.4 volts .::!:. .25

5 DBM.::!:. 3 DB

a.volts

see procedure

see procedure

6;2-volts .::!:. .5

1.8 volts peak

.6 volts+ .15

-1.0 volts+ .1

1.5 x TP8 reading at Fe level of -107 DBM

.::!:. 3 volts peak to peak

...

UNION SWITCH & SIGNAL 83 J1 - 1 Loco. Sel 1 J1 - 26 DS

J1 - 2 Brake J1 - 27 AS

J1 - 3 HF J1 - 28 AUX

J1 - 4 HS J1 - 29 Station Common 2

J1 - 5 BU J1 - 30 NC·

J1 - 6 DS J1 - 31 Loco. Sel 3

J1 - 7 AS J1 32 Brake

J1 - 8 AUX J1 - 33 HF

J1 - 9 Station Common 1 J1 - 34 HS

J1 -. 10 NC J1 - 35 BU

J1 - 11 Demand Common J1 - 36 DS

J1 - 12 Demand J1 - 37 AS

J1 - 13 DC +V Isolated J1 - 38 AUX

J1 ·- 14 DC +V Isolated J1 - 39 Station Common 3

J1 - 15 OV Common J1 - 40 NC

J1 - 16 OV Common J1 - 41 Loco. Sel 4

J1 - 17 +V J1 - 42 Brake

J1 - 18 NC J1 - 43 HF

J1 - 19 Test Key J1 - 44 HS

J1 - 20 Test Data J1 - 45 BU

J1 - 21 Loco. Sel 2 J1 - 46 DS

J1 - ·22 Brake J1 - 47 AS

J1 - 23 HF J1 - 48 AUX

J1 - -24 HS J1 - 49 Station Common 4

J1 - 25 BU J1 - 50 NC

Figure 6-6. Input Plug Information

6289, p. 6-33/6-34

SERVICE MANUAL 6289 Appendix A

Parts List --


March, 1985 WP0194B-0023D A-3/85-2592· 1

PRINTED IN USA

. LSR-500



PARTS LIST

INTRODUCTION

This parts list provides parts ordering information on the major components of the LSR-500 System. No detail parts of the printed circuit boards are provided. If boards are determined to be faulty, it is recommended that they be returned to US&S for repair or replacement.

HOW TO USE

A-ii

The part number column list parts that are manufacured and supplied by US&S, parts available through vendors, or parts that are considered commercially available.

a. US&S Parts - All parts available only through US&S are prefixed with the letter J.

b. Vendor Parts - Parts available through other suppliers are noted by the manufacturer's name in parenthesis, following the description of that part. The manufacturer's part number is given in the Parts No. column.

c •. Commercial Parts - These are parts that can generally be purchased at local supply houses. These parts are identified as Com'l. in the Parts No. column.

L

LSR-500 SYSTEM PARTS LIST (See Figure A-1)

RF FREQUENCY


Item Equipment 452.925 MHz 452.950 MHz - 464.6375 MHz*

1

2

3 4 5 6 7

Office With Standby (See Figure A-2) J793074 Office Without Standby J793072 Car Carried (Complete) (See Figure A-3) J193073 Car Carried (Without Antenna & Display Unit) J793073-0001

Aspect Display Unit (See Figure A-4) Auto/Manual Switch (See Figure A-5) Transmitter Antenna (With 150' Ca.ble) Receive Antenna (450-470 MHz) Cable, Aspect Display

INPUTS FROM YARD OFFICE CONTROLS

1

MAIN TRANSMIT

UNIT

STANDBY TRANSMIT

UNIT

J793077 J793080 J793076 J793079

J793078 J793081

J793078-0001 J793081-0001

Part Number

J793073-0002 J793073-0004 J793075 J793073-0008 J793073-0003

Figure A-1. LSR-500 Speed Regulation System

6289, p. A-1

i


Item

1 2 3 4 5

2 ...............

OFFICE TRANSMITTER RACK ASSEMBLY (See Figure A-2, Sh. 1)

Equipment

Rack, 79-1/4 x 24-3/16 x 23-7/8 (Bud) Door (Bud) Transmitter Assembly (See Figure A-2, Sh. 1) Test Panel Assembly (See Figure A-2, Sh. 2) Screw, 10-32 x 5/8 !n.

T -

r -......

..

:oo:oo Ill): . ~ ..... (SI

0:

IG . .. (I):

l<ll 0 0 CJ (SI~

~ o ~ ol ·Y (I) "'

"' .

"'

[ '· .

I

Part Number

E-2006RB (Blue) E-9006RR (Blue)

J793072-0003 Com'l.

l /7.50

. ----I-- 3

~ 4

~·

5

r----_ 1

Figure A-2. Office Transmitter Rack Assembly (Sheet 1 of 3)

6289, p. A-2

\

Item

1 2 3 3 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 -

23 24 25 26* 27* 28* 29* 30* 31 32 33 34 35 36 37

Transmitter Assembly (See Figure A-2, Sh. 2)

Equipment

Panel (Vectran) Transmitter Controller PCB, DST200 Transmitter PCB, DT470 (452.925 MHz) Transmitter PCB, DT470 (452:950 MHz) Transmitter PCB, DT470 (464.6375 MHz) Relay, 3 PDT, 120 Vac Socket, Relay Spring, Relay Hold Down Power Supply Suppressor, Transient, 130V Terminal Strip, 10 Term (Kulka) Marker, Term. Strip, ·1-10 (Kulka) Cover, Term. Strip (Kulka) Connector, Termi-Pt., 50 Pin (Kulka) Cable Assembly, Ant. (Vectran) Bracket, Pwr. Sup. Mtg. (Vectran) Thredstuds, 8-32 x 1/2 (Southco) Thredstuds, 6-32- x 1 /2-(Southco) Nut, Hex, 6-32 Lockwasher, #6, Split Lockwasher, #6, Ext. Th. Screw, 6-32-x 1/2, Pan. Hd. Screw, 6-32 x 1/4, Pan. Hd. Grommet, 3/8" I.D. Screw, Pan. lid. Lockwasher, #4, Split Standoff, Nylon, 4-40 x 3/4 Connector, Housing Recpt., 9 Pin Pin, Female,:0.093" Connector, Housing Plug, 9 Pin Pin, Male, 0.093" Terminal, Spade, Locking #8 Screw, 1/4-20 x 1", Hex. lid. Lockwasher,1/4",Ext. Th. Flatwasher,1/4" Nut, Hex, 1/4-20 Terminal , Ring, 1 I 4" Cable Assembly, 10 Pin, 8 Wire (Vectran) Connector, Housing 52 Pin (Amp.)

* Not Illustrated


Part Number

1510031 . J793072-0002

J793072-0001 . J793076-0001

J793079-0001 J793074-0001 Com'l. Com'l. J793072-0004 Com'l.

. 600A-10 MS600-10-XP-1A RC600.:.10 203628-6 1560802-01 1510035-01 .11-08-108.:24 77-08-106-24 Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com' 1. Com'l. Com'l. Com'l. Com'l. Com' 1. Com'l. Com'l. 560800-02 4-87631-3-4

6289, p. A-3

"' I\) (X)

"° ... "O • > I .i:::

·~ I-'-

~ Cl>

> I I\)

•

0 11, 11, I-'-a Cl>

~ 'i

~ to s I-'-& & Cl> 'i

> to to (1)

~ I-' '< ........ C/l P" . I\)

' 0 11,

w ._,

37

5fX,l('lfFT 8"7~

1

12

7,8,14,15

13, 17, 18, 19,20,21

0

--·~~-~ 0 0

•,1 111111N'l'1>sr zoo) 0

@ n n@

@ @ srP..v t,,sz..;

4,5,6, 16, 17, 18

,J

0

0

31 32 33 34 35

'pt

tUAt..li= 1£6'1/Alt,

P<-Vt'r

EE c z 0 z I ~ :c ~ en ci ~ r-

C)

C)


Transmitter Rack Test Panel Assembly (J793072-0003) (See Figure A-2, Sh. 3)

Item

1 2 3 4 5 6 7 8 9

10 11 12 13

Equipment

Panel, 19 x 3-1/2 (Vectran) Switch, Toggle, DPDT (Alco) Lamp Holder (Dialight) Lens, Lamp Lamp, Neon; 120V (Dialight) Fuse Holder Fuse, Amp., 3AG Label "ON OFF" (Alco) Screw, 6-32 x 3/4, Flat Hd. Lockwasher, #6, Ext. Th. Flatwasher, !16 Nut, 6-32-, Hex Terminal, Ring, #6

1

·--.- -~~ .. -r-·1-~. 9 10 12 13.

.Sl!"t:Tt(IA/ "A-A" 2 1·

STBY

8

3 4 5

Part Number

1560010 MTG 1060 95-0408-09-341

. Com'l. BIA (NE-51) Com 'l. Com'l. SPA-42 Com'l. Com'l. Com'l. Com'l. Com'l.

!MANTI e.

!NORM!

6 7

A

Figure A-2. Test Panel Assembly (Sheet 3 of 3)

C)

C)

6289, p~ A-5

. ffi UNION SWITCH & SIGNAL

Item

1 2 3 4 5 5 5 6 7 8 9

10 11 12 13 14 16 17 19 20 21 22 23 24 25 26 27 28 29

Receiver-Decoder Enclosure (See Figure A-3, Sh. 1)

Equipment

Cabinet, 16" x 20" .x 8" (Vectran) Panel Assembly (Vectran) Receiver Pwr. Sup. & Logic PCB, DRS200 Receiver, VHF PCB, DR150C PCB Assembly, UC450, 452.925 MHz PCB Assembly, UC450, 452.950 HMz PCB Assembly, UC450, 464.6375 HMz Cable Assembly, 10 Pin, 10 Wire (Vectran) Cable Assembly, SMB to SMB (Vectran) Cable Assembly, Ant. "A" (Vectran) Standoff, Hex, 4-40 x 1/4" (H.H. Smith) Standoff, Nylon 4-40 x 3/4" (H.H. Smith) Thredstud, 4-40 x 5/8" (Southco) Standoff, Nylon, 4-40 x 3/8" Screw, 2-56 x 5/8", Pan Hd. Screw, 2.:.56 x 1", Pan Hd. Lockwasher,#4, Ext. Th. Lockwasher1#2, Ext. Th. Nut, Hex, 2-56 Terminal, Ring, #2 Wire, Teflon, 22 Ga., Red Screw, 6-32 x 3/8", Pan Hd. Screw~ 8-32 x 1/2", Pan Hd. Nut, Hex, 6-32. Lockwasher,#6, Int. Th. Nut, Hex, 4-40 Rubber, 9-1/4 x 3 x 1/4" Cable Tie Mt. Cable Ties

6289, p. A-6

Part Number

1560111 1000138 J793073-0006 J793073-0007 J793072-0005 J793078-0002 J793081-0002 1560800-01 1560814 1560802-03 2330 4309 77-10-104-13 Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com' 1. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l.


0

' ' 0

,l

.... -~ D ...; N

t D ~ .;

.... ,;,,-N ....

CP,I

tJ) '\

I ~1 :: ~

en ,,.. '1 fO co N

N .... g fO .... ;s ~ ... en ...... .... ,-...: en ....

en -....: ,... cri ..... i:,i ....

' en ~ .... ~ ....: -... -i::i' ....

,...

.... CP,I

Figure A-3. Receiver-Decoder Enclosure (Sheet 1 of 2)

6289, p~ A-7


Item

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39* 40* 41* 42 43 44* 45* 46*

Receiver-Decoder Panel Assembly (See Figure A-3, Sh. 2)

Equipment

Panel (Vectran) Relay, 3 PDT, 24V Socket, Relay Spring, Relay Hold Down Relay, DPDT, 24V Inductor, 70 mH, 2A. Suppressor, Transient, 150V Resistor, 400 ohm, 3%, 10W, WW Resistor, 560 ohm, 3%, 1~W, WW Resistor, 51K ohm, 5%, 2W, CC Capacitor, Electrolytic, 1200 mfd., 250V Bracket, Cap. , Mtg. , 2" Terminal Strip, ·22 Pos. Marker, Terminal Strip, 1-22~ Style A Marker, Terminal Strip, 1-22, Sty1e 4C Terminal Block Terminal End Anchor Terminal Mtg. Track Terminal, Fuse Clip Terminal End Barrier Fuse Puller Fuse, 5A (Bussman) Fuse, 1A (Bussman) Label "TB1". Label "TB2" Label "TB3" Diode, 1N4007 Screw, 3-48 x 1 /4"-, Pan. Hd. Lockwasher, #3, Split Screw, 6-32-x 1/2", Pan Hd. Lockwasher~#6, Split Screw, 8-32-x 5/8", Pan Hd. Screw, 8-32 x 3/8", Pan Hd. Lockwasher, #8, Split Screw, 1/4-20 x 1", Hex Hd. Lockwasher, 1/4", Ext. Th. Flatwasher, 1/4" Nut, 1/4-20, Hex Wire, Teflon, 16 Ga., Black Wire, PVC, 18 Ga., Yellow Terminal, #8, Spade Locking Terminal, 1 /4" Ring · Resistor, ·200 ohm, 3%, 1 OW, WW Connector, Housing, 52 Pin Contact, Crimp Terminal, F, Pushon, 0.25

* Not Illustrated

6289, p. A-8

Part Number

1560003 Com'i. Com'l. Com'l. Com'l. Com 'l. Com'l. Com' 1. Com'l. Com'l. Com'l. Com'l. -Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. FNQ FNQ

Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com' 1. Com'l. Com'l. Com'l. Com 'l. Com'l. Com'l. Com'l. Com'l. Com'l. Com'l.

"Xj I-'"

~ (D

> I w

l:i::J (D () (D I-'" ..; (D "'$ I

i () 0

~ "'$

~ ~ f--'

> to to

i f--' «: .......

~ (D c-t"

I\)

0 1-1)

O'\ I\) I\) co.._,, I.O .. 'O • > I

I.O

~ 2 () ~ ~

2,3,4 27,30,31

43,28,29

.-

7,33,34 10, 11, 12,33,34

0

Iii ©

0

0

0

121

0

6,33,34

lil' @

121

@

9,28,29

@

.IWWbo'!,..11

0 1:. \ ~-~~·~

13, 14,30,31 25 22

24 16, 17, 18, 19,20 21, 23,33,34

~ ...,

0

@@

5,32,34

13,15,30,31

26

0

1

35,36,37 ,38,42

c z 6 z I ~ :c • (I)

c5 z )I, ...

EE

83 UNION SWITCH & SIGNAL

Aspect Display Unit (J793073-0002) (See Figure A-4)

' Item Equipment Part Number

l 1 Cabinet (Vectran) 1560112 2 Aspect Logic PCB, DI100 J793073-0009

' 3 Bracket, Swivel (Vectran) 1510033-01 4 Bracket, Swivel (Vectran) 1510033-02 5 Bracket, Display Mtg. (Vectran) 1510034 6 Alarm, 10-48V (Mallory) SC648 7 Display, 7 Seg: Incand. (Dialight) 710-0301..:.025 8 Placard, Light Assembly (7) (Vectran) 1000169 ' 9 Switch, Toggle, Maint. (Alco) MTG-226P

10 Connector, Box Recpt., 14 Pin (Amphenol) MS3102A20-27P ,(.

11 Connector, Housing, 52 Pin (Vectran) 2501035 12 Bezel Filter, Red. (IEEE) DMH24036P-04 13 Threaded Rod, 3/8-16 x 7-1/4" Com'l. I

14 Spacer, 7/16 I.D. x 5-3/4", St. St. I Thinwall Com·11.

15 Lockwasher, 3/8", Split Com'l. ' I 16 Nut, 3/8-16, Hex Com'l.

I l

. 17 Pins, Crimp Com'l. ' 18 Screw, 10-32 x 3/8", Pan. Hd. Com'l. 19 Lockwasher, #10, Split Com'l. ' 20 Nut, 10-32, Hex Com·11. 21 Screw, 4-40 x 1/2", Pan Hd. Com 'l. 22 Screw, 4/40 x 1/2", Flat Hd. Com'l. 23 Lockwasher, #4, Split Com'l. 24 Nut, 4-40 Hex Com'l. 25 Wire, Teflon, 16 Ga. Red Com'l. 26 Wire, Teflon, 16 Ga. Black Com'l.

I 27 Wire, Teflon, 22-Ga. Brown Com'l. 28 Wire, Teflon, 22 Ga. Red Com'l. 29 Wire, Teflon, 22-Ga. Orange Com 'l. 30 Wire, Teflon, 22 Ga. Yellow Com'l. 31 Wire, Teflon, 22-Ga. Green Com'l. l

32 Wire, Teflon, -22 Ga. Blue Com'l. I I

33 Wire, Teflon, 22 Ga. Vio. Com'l.

I 34 Wire, Teflon, 22 Ga. Gray Com'l. I 35 Wire, Teflon, 22 Ga. White Com'l. "1 l

37 Wire, Irr. PVC, 18 Ga. Green Com'l. 38 Terminal, #4 Ring Com'l. 39 Lockwasher, #4, Ext. Th. Com'l.

6289, P• A-10

24 21

6

0

5

8

a a . a 0

a a a a a 0

a 0

a

24

. 12

1

21 23 24

9

10

Figure A-4. Aspect Display Unit

18 19 20

4


2

13 14 15 16

0

i-• r 2

6289, p. A-11


MAN AUTO

4.00

MT6. bit'\. --411--------"I"""·-- 2. 3 7

0

Figure A-5. Manual/Auto Switch

6289, P• A-12

locomotive speed regulation system lsr-500 · 2015. 6. 9. · the door while the dr150 and the...

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