series 94 troubleshooting

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Series 94

Troubleshooting Guide


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Introduction Series 94 Troubleshooting Guide

I Introduction

This troubleshooting guide is organized into 5 sections which are intended to help you operate, test andtroubleshoot Series 94 Stabilized Antenna Systems. Should you find any errors, or have any suggestions, pleasecall or fax your input to Sea Tel.

Refer to the appropriate Quick Start Operation guide for your system for routine operation.

When you need to isolate a problem, start with the Troubleshooting Procedures section. Many problems areactually found to be an incorrect operator setting or parameter, rather than a component failure. Follow theprocedures through Initial Power-up Operation, to functional Testing and finally to Problem Scenarios or Troubleshooting Modules.

If you have identified a specific failure, you may prefer to go directly to the appropriate Troubleshooting Module(s)to begin (refer to the Table of Contents).

In using this troubleshooting guide you may be pointed from a procedure, test or problem to another section or toa troubleshooting module. You may also be directed from one troubleshooting module to another. The “act ion to take/step to g o to ” column contains several key words which are used to direct you. These are:

(blank) go to the next step down

re-check re-check this step before going on

re-test re-test a specific step then proceed as directed by that step

return return to the previous module step or procedure that pointed you to this section of stepsREQUIRED EQUIPMENT

The tools and equipment necessary to perform these tests are:

a. Service Manual with Troubleshooting Guide

b. Multimeter

c. Basic Technicians tools

d. Spare Parts Kit

e. Bubble level (small)

f. 9-Pin Loop-Back connector

g. 15-Pin In-Line test-point connector

CAUTIONS


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Table of Contents

I Introduction 1-1II Quick Start Operation 2-1III Troubleshooting Procedures 3-1

1 Basic system power-up and initial operation 3-1

1.1 Turn on the satellite receiver(s) 3-1

1.2 Other Distribution Equipment 3-1

1.3 Turn on the TV(s) 3-1

1.4 WeSat Equipment 3-1

1.5 Turn TAC-92C Power ON 3-11.5.1 Press RESET 3-11.5.2 Front Panel key checks 3-21.5.3 Press the SHIP 3-21.5.4 Press SAT 3-21.5.5 Verify that the TAC-92C parameters 3-2

1.6 When the antenna has completed initializing 3-31.6.1 If the antenna acquires the desired satellite 3-3

1.6.2 If the antenna is not on the DESIRED satellite 3-31.6.3 If the antenna does not acquire any satellite 3-4

1.7 Check for blockage 3-4

2 Functional Testing 3-4

2.1 TAC-92C Front Panel Test 3-4

2.2 Azimuth Drive Test 3-4

2.3 Elevation Drive Test 3-4

2.4 Targeting Test 3-5

2.4.1 Test Targeting 3-52.4.2 Evaluate AZ & EL TRIM Values 3-6

2.5 AGC Signal Level Tests 3-7

2.6 Tracking Test 3-8


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Introduction Series 94 Troubleshooting Guide

Table of Contents

3.5 IF Distribution Problem 3-15

3.6 Remote Not Responding 3-15

3.7 TAC-92C Display Blank 3-15

IV Troubleshooting Modules

ACC1.0 Antenna Control Cable 4-1

AZD1.0 Azimuth Drive problems 4-4

AZR1.0 Azimuth Rate Sensor 4-9

CLD1.0 Cross Level Drive problems 4-12

CLR1.0 Cross Level Rate Sensor 4-17

COMP1.0 Remote Compensation failure 4-21

ELD1.0 Elevation Drive problems 4-22

ELR1.0 Elevation Rate Sensor 4-27

ENC1.0 Encoder failure 4-31

ERR1.0 Error Codes 4-33

ERR2.0 ERROR CODE 0001 – Gyro Read Error 4-34

ERR3.0 ERROR CODE 0002 – Wrong Synchro Converter Type 4-41ERR4.0 ERROR CODE 0004 –Communications error 4-44

ERR5.0 ERROR CODE 0008 – Pedestal function error 4-47

ERR6.0 ERROR CODE 0016 – Conscan error 4-48

ERR7.0 ERROR CODE 0032 – Reserved for future use 4-55

ERR8.0 ERROR CODE 0064 – Reserved for future use 4-56

ERR9.0 ERROR CODE 0128 – Satellite Out Of Range 4-57

FLUX1.0 Fluxgate Failure 4-58

HOME1.0 Home Sensor / Home Flag 4-59

INIT1.0 Antenna Initialization 4-61

LEV1.0 Level Cage Motor (Size 17 Stepper Motor) 4-64


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Perform the following when the ship HAS NOT significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: The TAC 92 w i l l di splay:1. Turn Power “ ON”

Power switch is located in upper rightcorner of TAC-92 Rear panel.

Turn on Television and Satellite receiver

2. If you have the TAC-92 interfaced to the ships’ GYRO,

Press “ SHIP” four times. (If not, Go To Step 4)

3. Key in the current ships Heading to the nearest

degree, then press “ENTER”. Press “RESET”.

4. After Initialization

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red)

may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the

“TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid

-OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light

will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details.

Perform the following when the ship HAS significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: The TAC 92 w i l l di splay:

Display should read “REMOTE INITI ALIZING”

System will automatically go through an initialization

sequence which takes approximately 2 minutes.

Display should read “HDG xxx.x”

Display will change to read “REM OTE . . .VER.X.XX

”

Quick StartOperation for Series 94 DBS Systems


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9. From the MAGNETIC VARIATION TABLE below, choose

the city nearest your location and key in its AZ TRIM

value using all 4 digits; for POSITIVE values press

“ENTER”, for NEGATIVE values, press “N/S/E/W”

and then press“ENTER”.

10. Press “MODE” until “SAVE NEW PARAMETERS”is displayed. Press the UP arrow once, release,

then press “ENTER”.

11. Press the “SAT” key twice.

12. Key in the appropriate SAT Longitude from the

SATELLITE POSITION TABLE below.

Use the “N/S/E/W” key to select East or West

Longitude, then press “ENTER”.13. Press ”RESET”. After initialization...

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red)

may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the

“TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid

-OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light

will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details.

SATELLITE POSITION TABLE

SATELLITE SERVICE SATELLITE LONGITUDE (enter)DSS (Direct TV® & USSB®) 101WDish Network® 119W, 65W, 148W

GLA™ (Galaxy Caribbean) 95WWeSat™ - GOES 8 75WWeSat™ - GOES 10 135W

Display should read “SAVE NEW PARAM ETERS”

Display should read “SAT xxx”.

Display will change to read “REMOTE...VER.x.xx”


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Series 94 Troubleshooting Guide Troubleshooting Procedures

III Troubleshooting Procedures

Each test in this troubleshooting section steps through specific operations of the system. If the system does notoperate as explained, then follow the Troubleshooting Guide module listed after each step. This section alsoincludes common problems experienced in the field and solutions for each. The Troubleshooting Guide modulesare arranged in alphabetical order (i.e., AZD, ENC, UNWRAP, etc.). Each module refers to drawings and/or schematics which should be used during troubleshooting. The drawings and schematics for all Series 94 model

systems can be found in SECTION 5 following the troubleshooting modules. The Drawing list is organized byModel and includes a list of radome and TAC-92C drawings. The drawings following the listing are in drawingnumber order.

1 Basic system power-up and initial operation

This set-up procedure should be used for initial operation of the system. This will ensure that the antenna systemis set up correctly before trying to isolate a possible Electrical and/or Mechanical fault. The most common failuresare due to incorrect operator settings, incorrect parameter settings or blockage.

1.1 Turn on the satellite receiver(s)

Using the remote, make the menu selections necessary to view the signal meter display (Most Europeanreceivers do not have this option). This display will help in determining if the antenna is tracking thecorrect satellite. Also, the signal meter shows a transponder number. The odd numbered transpondersindicate “left hand” polarized signals and the even numbered transponders indicate “right hand” polarizedsignals. This information will be useful if troubleshooting an RF distribution problem.

1.2 Other Distribution Equipment

Assure that modulators, standards converters, amplifiers and any other equipment in the systemconfiguration are also energized.

1.3 Turn on the TV(s)

A th t th t l i i i t f th t h l ( i t) t di l th t llit i


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Troubleshooting Procedures Series 94 Troubleshooting Guide

1.5.2 Front Panel key checks

Sequentially press SHIP, SAT, ANTENNA and MODE to verify that each displays the appropriate

menu items. If the display does not change when the keys are pressed, refer to section 3 (below) – TAC-92C, Display does not change.

1.5.3 Press the SHIP key and verify that Latitude, Longitude and Heading are correct. If they are correct go to the next step. If Latitude, Longitude or Heading are incorrect

ü Press SHIP key again to select Latitude entry mode to update the present ship latitude.Enter the correct numeric value using the Numeric Keypad; use the N/S/E/W key toselect the correct hemisphere and then press ENTER.

ü Press SHIP key again to select Longitude entry mode to update the present ship

longitude. Enter the correct numeric value using the Numeric Keypad; use the N/S/E/Wkey to select the correct hemisphere and then press ENTER.

ü Press SHIP key again to select Heading mode. When the heading input is coming from aShips Gyrocompass, the initial heading MUST be entered for most gyro types (seeHeading Display Test section below). Enter the correct numeric heading value using theNumeric Keypad and then press ENTER. The display may “flash” back to some other number after pressing “ENTER”. This is because the antenna is initializing and cannotaccept the input until after initialization. The entry made is stored by the TAC-92C andwill update the PCU and should not need to be re-entered after initialization completes.

1.5.4 Press SAT and verify the Satellite Longitude and Receiver Selection & Tuning arecorrect

ü Refer to the Quick Start operation card(s) for a list of commonly used satellite longitudes.Press SAT again to select Satellite entry mode. Enter the correct numeric value usingthe Numeric Keypad; use the N/S/E/W key to select the correct hemisphere and thenpress ENTER.

ü Press SAT until the only the lower line is displayed. This display will show the AGC Inputsource & Tuning frequency (i.e. INA 01100) in the lower left and the present AGC valuein the lower right. Use the N/S/E/W key to toggle through the input selections, use thenumeric keypad to enter the desired frequency and press ENTER. When WeSatoperation is being used, select EXT input (no tuning frequency). For TVRO operation,use the INA xxxxx selection and enter the Ku-band downlink frequency or the


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+/- any mechanical error in the radome mounting. When the heading input source is froma Gyrocompass (True heading) this parameter is mechanical mounting error only.

ü AGC THRES – Set to 0128ü EL STEP SIZE – When operating in step track mode, set to 0002. When operating in

Conscan tracking mode, set to 0003.

ü AZ STEP SIZE - When operating in step track mode, set to 0002. When operating inConscan tracking mode, set to 0003.

ü STEP DELAY – Set to 0002

ü SEARCH INC – Set from 0018 to 0020

ü SEARCH LIMIT – Set to 0200ü SEARCH DELAY – Set to 0015

ü STEP INTEGRAL – When operating in step track mode, set to 0030, 0040 or 0060.When operating in Conscan tracking mode, this parameter MUST be set to 0000.

ü SYSTEM TYPE – Most commonly set to 72 or 76

ü GYRO TYPE – Set to 0000 when the antennas own internal fluxgate is being used for heading reference. Set to 0000 when an external fluxgate compass is being used for

heading reference (002 may be used on TAC-92C ver 2.77 or later). On 3294, 4094 and4894 systems the degree of accuracy needed is best met with the use of a ships gyroinput or an external fluxgate as its heading reference input. When using a Gyrocompass,the gyro type is determined by the type of Gyrocompass output AND the type of synchroconverter (daughter board) installed on the TAC-92C Main PCB — should be setaccording to the TAC-92C Heading Display Test information below. Also, when using asynchro or step-by-step input source, the Heading of the boat must be entered into theHDG display every time the antenna system power is cycled ON (including power failures or switching ship/shore power).

ü **Note** The heading output from a GPS is not an acceptable heading input to the TAC-92C. The “heading” output from these devices are actually Course Over Ground, whichdoes not guarantee an accurate heading reference.

ü POL TYPE – Set to 0001


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Assure that the TV is set to the correct input selection (CH # or LINE) for the satellite receiver output. Set the receiver to a promotional channel so programming can be seen when theantenna is on the desired satellite. Also check the IF distribution to the receivers.

Some boats have multiple feeds & receivers (i.e. DSS & GLA) onboard. Assure that the correctfeed & receivers are installed for the satellite service coverage in your location.

Re-target or manually search for satellite. Once the desired satellite is found, evaluate AZ & ELTRIM values to optimize the targeting of the antenna. If AZ TRIM needs to be greater than +/- 10degrees check Heading Testing in section 2 below. Refer to FLUX1.0 & MECH1.0 for troubleshooting the large value of AZ TRIM.

1.6.3 If the antenna does not acquire any satellite:

Assure that the TAC-92C receiver selection (INA, INB or IF) and tuning frequency is correct.There should be some level of AGC even when pointed away from any satellites. If the AGClevel does NOT change when you unplug the coax from the rear panel of the TAC-92C, thisindicates that there is a loss of IF input (failed coax, matrix switch or LNB OR a loss of DC voltageto the LNB) or a failure of the AGC tuner circuits. Refer to AGC Signal Level Tests, IFDistribution Problems and TAC-92C AGC problems below.

If the AGC does change significantly (400+ AGC counts) when you unplug the coax, check for blockage and refer to Functional Testing below to isolate the failure further.

1.7 Check for blockage:

Assure that there are no obstructions between the antenna and the satellite. The satellite signal is line of sight and any object that is directly in the signal path will attenuate the signal. The satellites are inGeostationary orbit over the equator, therefore they should be south of you if you’re in the northernhemisphere or north of you if you’re in the southern hemisphere. You can visually sight past the radometoward the approximate direction of the satellites to see if there may be some object in the satellite signalpath. The satellite signal will penetrate through most thin plastic and fiberglass with a small amount of attenuation but will not penetrate through metals, buildings or other structures that are in between the

antenna and the desired satellite. If there IS blockage between the antenna and the desired satellite, theantenna may not be able to acquire that satellite until the boat is moved or turned to a different headingwhere no obstructions are in the signal path to the antenna. It may acquire, and track, an adjacentsatellite which is not blocked.


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move on to, or off of, a satellite signal. If you are not able to find a satellite signal to verify drive this way,you will have to actually observe the antenna pedestal while someone else steps the antenna from theTAC-92C. Refer to ELD1.0 to troubleshoot.

2.4 Targeting Test

Targeting is the accurate azimuth and elevation positioning of the antenna in three dimensional space.There are two ways you can target the antenna. They are Satellite Targeting and Azimuth and/or Elevation Targeting.

Satellite Targeting is the process of targeting a desired Satellite Longitude (SAT). The TAC-92C thencalculates Azimuth and Elevation angles required to point the antenna at that satellite position from theboats present LAT & LON. The Relative Azimuth (REL) angle is adjusted using the heading (HDG) and

the AZ TRIM values in the TAC-92C to convert it to TRUE Azimuth (relative to TRUE North) and tocompensate for mechanical radome installation error. [TRUE AZ = REL + HDG + AZ TRIM]. Theantenna is then driven to the calculated True Azimuth and Elevation angles.

Azimuth and/or Elevation Targeting is the process of targeting an accurate Relative Azimuth, True Azimuth or Elevation angle of the antenna. Relative Azimuth is targeted from the azimuth entry windowby keying in the desired numerical value, pressing the N/S/E/W key and then pressing the ENTER key.True Azimuth is targeted from the azimuth entry window by keying in the desired numerical value andthen pressing the ENTER key. Elevation is targeted from the elevation entry window by keying in thedesired numerical value and then pressing the ENTER key.

Normally, you target a satellite using either of the methods above, the antenna acquires the desiredsatellite, begins tracking it and you are able to watch the desired programming. This seems very simple… but is very complex and can be difficult to troubleshoot (you will have to investigate all of the functionsand tests that relate to any of the “indications” listed below). Repeatable, accurate targeting indicates thefollowing:

• The antenna initialized correctly to its starting REL and EL positions. There is no positive feedback of actual antenna position. The displayed position values are the result of this starting position value +/-(increment/decrement) all of the steps issued to the AZ/EL motors since initialization was completed.

This assumes that the initial pointing angles were achieved during initialization and that every stepissued since then was carried out.

• Azimuth drive is good. All of the steps issued to the AZ motor are being carried out. The antenna isnot binding or dragging in the radome (causing pulse slipping). The drive circuits, motor and belt


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2. Select Azimuth entry and key in a value +/-100 degrees or more from the present AZ position.

3. Select Elevation entry and key in a value of 000 or 090.4. The search LED will flash, indicating that the antenna is targeting to the pointing

angles you specified. Allow 30-60 seconds for the antenna to drive away fromthe satellite.

5. Press SAT twice, key in the desired satellite longitude and then press the ENTERkey to re-target the satellite.

6. Verify that the antenna again drives to, and acquires, the desired satellite.

7. If Targeting accuracy is satisfactory, skip to section 2.5 to continue functionaltesting. If the targeting accuracy was not satisfactory, evaluate AZ & EL TRIMvalues to improve targeting accuracy before proceeding.

2.4.2 Evaluate AZ & EL TRIM Values

1. While “on satellite”, turn Tracking OFF (press AUX1).

2. Select Azimuth entry and key in a value +/-100 degrees or more from the present AZ position.

3. Select Elevation entry and key in a value of 000 or 090.

4. The search LED will flash, indicating that the antenna is targeting to the pointingangles you specified. Allow 30-60 seconds for the antenna to drive away fromthe satellite.

5. Press SAT twice, key in the desired satellite longitude and then press the ENTERkey to re-target the satellite. Press AUX1 to turn tracking OFF so the antennawill not go into search. Press ANTENNA to view the antenna position.

6. When the antenna AZ & EL values stop changing, record the AZ & EL that the

antenna targeted to. Press AUX1 to turn tracking ON and allow the antenna totime-out and begin searching OR manually adjust AZ & EL pointing to be ONSatellite.

7. When the desired satellite is acquired, allow tracking to peak up the satellite


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2.5 AGC Signal Level Tests

When the antenna is not pointed at a satellite

you should still have some level of AGC,representing the level of background noisefrom space. As you move the antenna closer to a satellite signal you will note that the AGCrise is directly proportional to the amount of satellite signal level rise (as shown in thisplot). AGC levels are different for each modelantenna, weather conditions and satellitesignal level.

There should be a very pronounced change inthe AGC value when you switch the inputselection between EXT, INA, INB and IF (EXTshould be very low value) OR when youdisconnect the IF coax from the rear of theTAC-92C while observing the normalselection (i.e. INA). If the AGC does notchange, there is a loss of IF into the AGCtuner or the tuner has failed.

AGC Level vs. Antenna Position plot

The AGC value should never be 0000 or 4095.

30-40 counts of AGC is approximately 1dB of satellite signal.

Auto-Threshold will normally set the Threshold at about 3dB above the background noise level.Threshold is a value that the TAC-92C uses to indicate loss of satellite signal so it can initiate a searchpattern. When AGC falls below Threshold the TAC-92C will wait “search delay” number of seconds. If the AGC does not come back above Threshold before the delay time the TAC-92C will initiate a searchpattern in an attempt to acquire/re-acquire a viable satellite signal.

AGC Test

1. Record the Peak AGC Level. Turn tracking OFF.

2. From peak, select Azimuth or Elevation Entry mode. Step the antenna UP or DOWNwhile monitoring the AGC Level. The level should rapidly fall to the background noise


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2.6 Tracking Test

A simple way to test tracking is to conduct a 4-Quadrant test.

1. Turn tracking OFF2. Select Azimuth Entry mode

3. Step the antenna DOWN in AZ until the AGC falls about 100 counts. If the antenna hasConscan you will see 6s flashing in the lower left of the display. Turn tracking ON andverify that the antenna moves up in azimuth and re-peaks the AGC level.

4. Turn tracking OFF and step the antenna UP in AZ until the AGC falls about 100 counts.If the antenna has Conscan you will see 4s flashing in the lower left of the display. Turntracking ON and verify that the antenna moves down in azimuth and re-peaks the AGC

level.5. Select Elevation Entry mode, turn tracking OFF and step the antenna UP in EL until the AGC falls about 100 counts. If the antenna has Conscan you will see 2s flashing in thelower left of the display. Turn tracking ON and verify that the antenna moves down inelevation and re-peaks the AGC level.

6. Turn tracking OFF and step the antenna DOWN in EL until the AGC falls about 100counts. If the antenna has Conscan you will see 8s flashing in the lower left of thedisplay. Turn tracking ON and verify that the antenna moves up in elevation and re-peaks the AGC level.

2.7 Heading Testing

Heading input is used for Targeting a satellite (the Heading input is added to the Relative position of theantenna to equal the TRUE Azimuth position of the antenna) and as a long term input to the AzimuthStabilization loop.

The Gyro Type parameter must be set correctly for the type of heading input device.

The heading input must be stable (after power is turned ON, most Gyrocompasses will take 4 hours, or more, to “settle” and provide a steady heading output). The antenna will not stay pointed ON satellite

if the Heading input is not stable.The more accurate the heading input is, the more accurate targeting will be. Refer to the paragraph onTargeting Test to check targeting accuracy.

2 7 1 Internal Fluxgate


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Gyro Type parameter is 0000 (0002 should be used on TAC-92C software ver 2.77 or later ).NOTE: If the external fluxgate is not energized or the input fails, the TAC-92C may revert tousing the antenna’s internal fluxgate.

The device must be NMEA0183 compliant, be properly installed and calibrated (compensation).

Heading is displayed directly from the device output, you will not be able to enter a “heading”value to correct the display (display will revert to the value read).

The heading value displayed should be within +/- 1.0 degrees of the boat’s actual heading. If it isnot, compensation needs to be performed or the device is not aligned to the bow of the boatcorrectly (refer to the manual for the device).

AZ TRIM value is the sum of the Magnetic Variation for the geographic area +/- any radome

mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to thebowline of the boat).

If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boats actual heading whendockside or on a steady course) troubleshoot using the manual for the external fluxgate device.

2.7.3 Gyrocompass - NMEA Heading Output:

When using an NMEA Heading Output from a Gyrocompass as the heading input to the TAC-92C, it should be connected to J-13 (NMEA input) on the rear panel of the TAC-92C. Becausethis input comes into the Aux. Serial Port (J-13) the sum that is entered as the System Type

Parameter value must include 8 (i.e. 8, 12 or 72).

Gyro Type parameter is 0000 (0002 can also be used on latest TAC-92C software). NOTE: If the Gyro is not energized or the input fails, the TAC-92C may revert to using the antenna’sinternal fluxgate.

The device must be NMEA0183 compliant, be properly installed and calibrated.

Heading is displayed directly from the device output, you will not be able to enter a “heading”value to correct the display (display will revert to the value read).

The heading value displayed should be within +/- 1.0 degrees of the boats actual heading. If it isnot, the device is not aligned to the bow of the boat correctly (refer to the manual for the device).

Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY theradome mounting error (accuracy of the alignment of the radome so that Relative 360 0 is parallel


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Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY theradome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallelto the bowline of the boat).

Azimuth display will be HDG + REL + AZ TRIM.

If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boat’s actual heading whendockside or on a steady course) troubleshoot using the manual for the Gyrocompass.

If you are getting Error Code 0001 or 0002 refer to ERR1.0. Also refer to Ships Gyro Input FaultIsolation below.

2.7.5 Gyrocompass – Synchro Heading Output

CAUTION: Electrical Shock Hazard - Synchro Ships Gyrocompass outputs are commonly110VAC 60 or 400 Cycle. This AC voltage is still present at the Terminal Mounting Strip andinside the TAC-92C when the TAC-92C power is turned OFF.

When using Synchro Heading Output from a Gyrocompass as the heading input to the TAC-92C,it must be connected to TB1 on the Terminal Mounting Strip (R1, R2, S1, S2 & S3 connections)which plugs into J-3 on the rear panel of the TAC-92C.

Gyro Type parameter is set to the correct value for the ratio of the Synchro information AND for the Synchro Converter (daughter board) installed on the Main PCB inside your TAC-92C. Theratio is the number of AC sinewave transitions on the output phases (S1, S2 & S3) per full 360degree turn of the boat.

1:1 Synchro is Gyro Type 0001



360:1 Synchro is Gyro Type 0360 or 0362 (dependent on Synchro Converter)

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON to

provide an initial heading if you are using 36:1, 90:1 or 360:1. Heading is incremented, or decremented, as sinewave transitions are received from the Gyrocompass.

The heading value displayed should be within +/- 1.0 degree of the boat’s actual heading. If theheading is incorrect, attempt to enter in the correct heading and then monitor the heading. If the


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2.9 Initialization Test

If you have isolated problems to the antenna (Targeting, Stabilization or Tracking) this is the best test to

start troubleshooting the antenna with. In many cases it is very difficult to open the radome and view thepedestal … but it is by far the best test to start with.

Remove the radome top. Cycle the TAC-92C power off. With power off, rotate the Level Platform fullyCW against the stop, tilt the antenna about 10 degrees off level and rotate the antenna to point straight upat zenith.

Refer to MECH1.0, VIS1.0 and INIT1.0. Have someone turn TAC-92C power ON while observing theantenna as it begins its initialization, which continues for approximately 2 minutes.

2.10 Rate Sensor / Stabilization Test

If all the functions during initialization are correct, then turn tracking or searching off after the antennatargets, to test the rate sensors. All three rate sensors require 12 volt DC input and will output 2.5 volts+/- 100 MV with no motion across the rate sensor axis. When motion is applied, the rate sensor has avoltage range of 0 to 5 VDC (+/- 2.5) depending on the direction of the motion. Perform the followingchecks to isolate any problems.

1. Turn tracking and/or searching off to stop the antenna from moving.

2. Slightly loosen the three Philips screws securing the Elevation rate sensor mountingplate. “Wiggle” the rate sensor and observe the elevation motor react by moving theantenna in the opposite direction of the applied motion. Tighten screws when finished. If the antenna does not react in elevation, follow ELR1.0.

3. Slightly loosen the three screws securing the Cross Level rate sensor. “Wiggle” the ratesensor and observe the cross level motor react by moving the cross level beam in theopposite direction of the applied motion. Tighten screws when finished. If the antennadoes not react in cross-level, follow CLR1.0.

4. Slowly move the Azimuth rate sensor back and forth and observe the azimuth motor move the antenna pedestal in the opposite direction of the applied motion. If the antenna

does not react in azimuth, follow AZR1.0.2.11 Fluxgate Compensation Test

The fluxgate is located in the level platform assembly on the antenna. The demodulation circuit for the


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§ Faulty wiring from the fluxgate to the PCU (Pedestal Control Unit). Use FLUX1.0 toisolate.

§

If the tests above check out satisfactory, then replace the PCU and follow theRemote Compensation Procedure to calibrate the new PCU.

EXTERNAL MAGNETIC INTERFERENCE:

§ Check for equipment within 4-5 feet of the antenna, which may contain magnets, or large amounts of steel.

§ If the boat is steel or there are magnetic objects that cannot be relocated, then thesolution is to interface the system with a Ship’s Gyrocompass (S-B-S or Synchro) or an EXTERNAL Fluxgate compass (Ritchie DH-200 or KVH Autocomp 1000).

4. COMP GAIN ERROR: This error will occur if there is not enough signal for the fluxgate.If there is too much signal a “COMP RANGE ERROR” will probably occur first. If thesystem has worked well until the boat traveled to a northern latitude, the problem is mostlikely not enough signal for the fluxgate to accurately process. To rule out a faultyfluxgate, follow FLUX1.0. Other causes could be from external magnetic interference(i.e., steel, and magnets).

3 Symptom / Problem Scenarios

3.1 Antenna Drifts Off Satellite

Improper tracking, parameter settings, rate sensor disturbance or problems with thefluxgate/Gyrocompass can cause drifting off the satellite after lock.

Verify that the tracking parameters (EL STEP SIZE, AZ STEP SIZE and STEP INTEGRAL) are setcorrectly.

If the system is using the internal fluxgate compass, use the Fluxgate Compensation procedure to isolatethe problem (COMP1.0 & FLUX1.0).

If the system is interfaced with the ship’s gyro, check the heading display on the TAC-92C and verify thismatches the ship’s heading on the Gyrocompass.

Use the Heading Input tests and fault isolation sections to isolate the problem


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If voltage is good at the TAC-92C output, then check the voltage at the LNB. This voltage should beapproximately 18 volts at the input of the LNB on the antenna.

If voltage output is low or not there at all, do a continuity check of all coax cables leading from the TAC-92C to the LNB.

If the voltage is good, but AGC shows below 800, then swap the two cables at the LNB outputs. Checkthe AGC again. If AGC is still below 800, replaced the LNB.

Also refer to SIG1.0 to troubleshoot.

3.3 Constant Unwrap LED

An unwrap occurs when the PCU reads the antenna pedestal is close to one of the two azimuth

mechanical stops. The mechanical stops should be at a Relative position of 0090 and 0630, allowing theantenna 540 degrees of rotation. When the antenna is in the center of this mechanical range of rotation,the REL position of the antenna is 360.0 and the system should be facing in line with the bow. When therelative position of the antenna is within 5 degrees of one of the stops an unwrap will be electronicallyinitiated (at 095.0 REL or 620.0 REL) and the antenna will be driven 360 degrees (plus or minus headingchanges during the unwrap) away from that mechanical stop. The PCU will send an unwrap indicator back to the TAC-92C, which will turn on the red unwrap LED. Usually, an unwrap is completed inapproximately 20-30 seconds.

This is a normal operation of the antenna and satellite programming will be lost until the antenna

completes unwrapping. The antenna should reacquire the satellite without intervention from the operator.On systems with an encoder, the PCU monitors the encoder output to decide when an unwrap shouldoccur. If the encoder output fails, the system may stay in unwrap. For ENCODER equipped systemsrefer to ENC1.0 & UNWRAP1.0 to troubleshoot.

On systems without an encoder, an unwrap failure can happen if the pedestal movement is restricted atany time (i.e., antenna scraping inside of dome or cables inside radome catching on pedestal). In“encoder-less” systems, refer to UNWRAP1.0 to troubleshoot.

3.4 Heading Input Fault Isolation

If the heading input source is inaccurate or unstable that antenna may not be able to target or stay onsatellite. The heading display should follow the heading source exactly, if the display is not updating, notstaying accurate or is changing opposite to what the input source is doing use the procedures below toisolate the problem


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§ 0001 for 1:1 input (usually installed on older military)

§ 0002 for S-B-S (Step-By-Step) installed on some yachts and commercial vessels

§ 0036 for 36:1 (usually on military boats)§ 0090 for 90:1 (rare)

§ 0360 for 360:1 (on yachts and some commercial)

§ 0362 for 360:1 (on yachts and some commercial)

3.4.3 SBS Gyrocompass Output [DC Voltage Signaling]

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON toprovide an initial heading. Heading is incremented, or decremented, step transitions are receivedfrom the Gyrocompass.

If there is no error light but the heading on the TAC-92C moves the wrong direction, then swapthe A and B leads.

If the Error LED (error code reads 0001) and the error will not clear, check the gyro-input voltagesat TB6 on the terminal mounting strip. Measure the voltage from COM to A, B & C respectively.One or two legs should be high (+ or – voltage level) and one or two will be low (below 10 VDC).

All three legs should never be High or Low at any instant in time (violation of Gyro truth table,which causes Error 0001). If not, check the ship’s gyro output.

Voltage on high leg should be approximately (+35, -35, +70, -70), depending on the voltage levelof the gyro being used.

Voltage on low leg must be below 10 volts. AC or noise spikes on the line is the most commoncause of Error code 0001 (two lines are high and the low line has noise which is interpreted bythe TAC-92C as a high state … therefore, all three lines appear to be high which is an illegalstate).

Measure from chassis ground to COM and the voltage should be a constant (0 volts, +/-35 or +/-70), without varying more than a few volts up and down. If it does vary with ship’s movement (i.e.low to high to low), then this is probably not the COM leg. Re-wire as necessary. Verify that the

COM has not been wired to the lamp output of the gyro. This would probably give a reading of ~15-20 VDC.

Refer to ERR2.0 for more information and troubleshooting.


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Turn power OFF, disconnect J1, turn power ON and check the display. If the display is lit, refer toACC1.0 and SPOOL1.0.

Turn power OFF, disconnect J3, turn power ON and check the display. If the display is lit, troubleshootGyrocompass connections for shorts.

Turn power OFF, disconnect J11, turn power ON and check the display. If the display is lit, troubleshootthe Aux. Serial Port input connections for shorts.

Turn power OFF, disconnect J13, turn power ON and check the display. If the display is lit, troubleshoot Aux. Serial Port input connections for shorts.

If the display is still not lit, open the TAC-92C and test the AC Voltage at the terminal barrier strip for thetransformer input. Refer to TAC1.0 to troubleshoot further.


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Series 94 Troubleshooting Guide ACC

Step Check/Test to perform Results Action to take - step togo to

ACC1.0 Antenna Control Cable

Refer to drawing 114787 Shielded ControlCable Assembly ACU to PCU

ACC1.1 Turn TAC-92C power OFF. Visually inspectantenna control cable connections.

Yes Straighten, reseat or replacepins as needed and re-check.

At the Antenna Control Unit, disconnect P1and visually inspect connector. Are any pinsbent, broken or pushed into the body of theconnector?

No

Yes Straighten, reseat or replacepins as needed and re-check.

At the antenna, disconnect the 9-pin circular plug and visually inspect. Are any pins bent,broken or pushed into the body of theconnector?

No

ACC1.2 Continuity checks

Install DE-9 loop-back continuity testconnector (shorts 1-2, 3-4, 5-6, 7-8 and 9-shield) on P1 at the ACU end of the antennacontrol cable.

YesCheck continuity of the Antenna Control Cableat the Antenna 9-pin Circular connector Plug:

Circ-1 to Circ-2 = Short




Circ-9 to Circ-spade = ShortIs continuity good?

No Repair harness and re-check

Remove the DE-9 loop-back continuity testconnector from P1.


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ACC Series 94 Troubleshooting Guide


Yes Repair and re-checkCheck P1 continuity from pin to pin:

P1-1 to P1-2 = Open

P1-1 to P1-3 = Open

P1-1 to P1-4 = Open

P1-1 to P1-5 = Open

P1-1 to P1-6 = Open

P1-1 to P1-7 = Open

P1-1 to P1-8 = Open

P1-1 to P1-9 = OpenP1-2 to P1-3 = Open

P1-2 to P1-4 = Open

P1-2 to P1-5 = Open

P1-2 to P1-6 = Open

P1-2 to P1-7 = Open

P1-2 to P1-8 = Open


P1-3 to P1-5 = Open

P1-3 to P1-6 = Open

P1-3 to P1-7 = Open

P1-3 to P1-8 = Open

P1-3 to P1-9 = Open

P1-4 to P1-5 = Open


P1-4 to P1-8 = Open

No


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Series 94 Troubleshooting Guide ACC


ACC1.3 DC Voltage checks

ACC1.3.1 Re-connect antenna control cable and turnTAC-92C power ON. Check the DC Voltagefrom C48 to ground on the TAC-92C MainPCB. Record the DC voltage.

ACC1.3.2 Check the DC Voltage at the Pol Aux RelayPCB from P1-3 (+28VDC) to P1-6 (ground).Record the DC voltage

Yes ReturnSubtract the voltage recorded in step

ACC1.3.2 from the voltage recorded in step ACC1.3.1. Is the loss across the antennacontrol cable less than 3.0VDC?

No

Yes Repair or replace the antennacontrol cable and re-test

ACC1.3

Is the antenna control cable 100 ft or less inlength?

No Contact Sea Tel Servicedepartment for instructions oninstalling junction boxes andheavier gage antenna controlcable conductors. Correctthen re-test ACC1.3


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AZD Series 94 Troubleshooting Guide


AZD1.0 Azimuth Drive problems

Refer to the Antenna System Schematic andthe Pedestal Harness Schematic drawings for all voltage and continuity checks.

Yes Return

Yes, Azimuthdrives but notconsistently

AZD1.2

No, Azimuthdrives thewrongdirection.

AZD1.6

AZD1.1 Test Azimuth drive to determine the nature of the drive problem. Turn the TAC-92C power ON, turn tracking OFF (press AUX1) andobserve azimuth drive while the antenna isinitializing, or while stepping, slewing or

targeting azimuth. Does the antenna driveproperly in azimuth?

No Azimuthdrive.

AZD1.2

AZD1.2 No Azimuth drive or drive is not consistent

Turn TAC-92C power OFF and removeradome top (or open the radome door):

Yes Contact Sea Tel Servicedepartment

Inspect inside of radome for signs that thedish or feed have been rubbing against theinside of the fiberglass radome. Are theresigns of rubbing?

No

YesRotate the pedestal through 540 degree rangeof azimuth motion. The antenna should rotatefreely and easily with light finger pressure. Dothe azimuth bearings rotate freely with no

binding in Azimuth?

No Contact Sea Tel Servicedepartment

Yes Re-route or tie cables awayfrom pedestal and re-check.

Assure that the cables in the base of theradome are not restricting or binding the freerotation of the pedestal. Is there cable No


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Series 94 Troubleshooting Guide AZD


Turn TAC-92C power ON

AZD1.3 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)or missing

AZD1.7

Check the DC Voltage on J4 and J5, from pin3 to ground and pin 4 to ground. Is the +12.0VDC OK?

No, voltage isgood on J4

but missing onJ5

Repair/replace TB1 and re-check

AZD1.4 Motor (M1) Continuity

YesDisconnect P5 and check continuity of themotor windings, measure from:

P5-1 to P5-3 or 4 ~25Ù

P5-2 to P5-3 or 4 ~25Ù

P5-5 to P5-3 or 4 ~25Ù

P5-6 to P5-3 or 4 ~25Ù

P5-1 to P5-2 ~50Ù

P5-5 to P5-6 ~50Ù

Is motor winding continuity good?

No Motor Open - Replace motor and re-check

Yes Motor shorted - Replacemotor and re-check

Check continuity of the motor windings toground:

P5-1 to ground = Open

P5-2 to ground = OpenP5-3 to ground = Open


P5 4 to ground = Open

No AZD1.5


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Yes Repair harness and re-checkCheck continuity from:






P4-1 to P4-2 = Open

P4-1 to P4-4 = Open


P4-2 to P4-4 = Open

P4-2 to P4-5 = Open

P4-2 to P4-6 = Open

P4-4 to P4-5 = Open

P4-4 to P4-6 = Open

P4-5 to P4-6 = OpenIs harness shorted?

No

Yes AZD1.1AZD1.5.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. Is

Azimuth drive restored? No Contact Sea Tel Servicedepartment

AZD1.6 Azimuth drives wrong direction

YesVerify motor wire color code to P5 per Pedestal Harness Schematic. Is the P5 wiredcorrectly?

No Replace motor and re-check


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Series 94 Troubleshooting Guide AZD


Yes TB1 short - Repair/replaceTB1, then AZD1.7.2

Disconnect P4 from TB1 and check +12VDCfrom P4 pin 4 to ground. Is the +12.0 VDCOK? No

Yes Harness open/short – AZD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No AZD1.7.4

Yes AZD1.7.2Turn TAC-92C power OFF and reconnect P1,P4 and P5. Turn TAC-92C power ON and re-check DC voltage from J4 and J5 pin 3 to

ground and pin 4 to ground. Is the +12.0 VDCOK?

No Pedestal Harness short –

Isolate shorted wire(s) or component(s), repair and re-check

AZD1.7.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then AZD1.8

Check DC voltage from P2-15 to groundunder load. This may also be done by opening the back-shell of P2 to access pin 15

OR by opening the PCU and access on U14 pin 5 . Is the voltage +24VDC or greater?

No

Yes Pol/Feed short – isolate,repair and re-check

Monitor the voltage from P2-15 to ground andunplug P1 from the Pol Aux Relay PCB. Isthe voltage +24VDC or greater when P1 isunplugged?

No

Yes Pedestal short – isolate,repair, and re-check

Monitor the voltage from P2-15 to ground andunplug P1 from PCU. Is the voltage +24VDCor greater when PCU P1 is unplugged?

NoYes PCU short – replace PCU,

then AZD1.8Unplug P2, remove the 15-Pin In-Line Test-Point connector from PCU and check thevoltage from P2-15 to ground. Is the voltage No


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Yes AZD1.8Re-insert the voltage select block (assure it isin the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then AZD1.8

Yes > 11VDC Re-test AZD1.1AZD1.8 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J4and J5 pin 3 to ground and pin 4 to ground. Isthe +12.0 VDC OK now?

No Contact Sea Tel ServiceDepartment


33/248

Series 94 Troubleshooting Guide AZR


AZR1.0 Azimuth Rate Sensor

AZR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to the stops when initializingor targeting a new azimuth.

2. Antenna does not stabilize in azimuth axisproperly.

3. The Unwrap LED may be frequently or constantly lit.

4. Antenna may oscillate in azimuth from oneend stop to the other end stop.

Refer to the Antenna System Schematicand the Pedestal Harness Schematicdrawings for all voltage and continuitychecks..

Fig 1 Azimuth rate sensor and connection.

AZR1.2 Turn TAC-92C power OFF and removeradome top (or open the radome door):


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AZR Series 94 Troubleshooting Guide


Yes Tighten the two Philipsscrews to secure themounting plate to the levelcage and re-check.

AZR1.2.5 The rate sensor must be firmly mounted to thelevel cage. Grip the body of the rate sensor with thumb and fore-finger of one hand whileholding the level cage firmly in the other hand.Gently wiggle the rate sensor. Is themounting plate loose on the level cage?

No

YesAZR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and fore-finger of one handwhile holding the level cage firmly in the other

hand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No AZR1.5

Yes Replace the rate sensor mounting plate and re-check.

Remove the two Phillips screws that attachthe mounting plate to the level cage, tightenthe rate sensor mounting screws and re-check. Is the rate sensor still loose on themounting plate?

No Re-install the mounting plate(and rate sensor) on the levelcage and re-check AZR1.2.5

AZR1.3 Rate sensor isolation

YesRemove the conductive tape and checkcontinuity from the metal body of the ratesensor to pedestal ground (=Open). Is therate sensor still shorted to pedestal ground?

No Tape was shorting – re-check AZR1.2.2

Yes AZR1.4.1, then re-check AZR1.2.2

Remove the two Philips screws to detach themounting plate (and rate sensor) from thelevel cage. Is the rate sensor still shorted topedestal ground?

No Screws were shorting - Next


Tighten the rate sensor mounting screws andre-check. Is the rate sensor still loose on themounting plate? No Re-check AZR1.2.2


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Series 94 Troubleshooting Guide AZR


AZR1.5 Nominal output voltage

Reconnect P1 and P18. Turn TAC-92Cpower ON

Assure that the boat is not moving at the pier and disconnect P5 (azimuth motor) from TB1.The pedestal is not to be rotated whilemonitoring the rate sensor output voltage (ratesensor not being rotated in free space).

YesMonitor the rate sensor output DC voltage

from P18 pin 4 to ground. Nominal when therate sensor is not being rotated is 2.50VDC+/-100mV. Is the voltage OK?

No AZR1.7

AZR1.6 Output voltage varies with motion

Yes AZR1.8Rotate the antenna in azimuth whilecontinuing to monitor the output voltage. CWrotation should cause the output to increaseabove 2.50VDC and CCW rotation causes the

voltage to decrease below 2.50VDC. Theamount of increase/decrease from nominal isproportional to the rate of rotation. Does theoutput vary as the antenna is rotated?

No Replace rate sensor and re-check AZR1.5

Yes Replace rate sensor and re-check AZR1.5

AZR1.7 Measure the DC voltage from P18 pin 5 toground (metal body). Is the 12 VDC OK?

No

Yes AZR1.4.1, then re-check AZR1.5

Disconnect P1 from the PCU and check theDC voltage from J1 pin 40 to ground. Is the

+12VDC OK? No Replace PCU and re-check AZR1.5

Yes AZR1.9AZR1.8 Re-connect P5 (azimuth motor) to TB1 and


36/248

CLD Series 94 Troubleshooting Guide


CLD1.0 Cross Level Drive problems

Refer to the Antenna System Schematicand the Pedestal Harness Schematicdrawings for all voltage and continuity checks.

Yes Return

Yes, CrossLevel drivesbut notconsistently

CLD1.2

No, CrossLevel drivesthe wrongdirection.

CLD1.6

CLD1.1 Test Cross Level drive to determine thenature of the drive problem. Tilt the crosslevel beam about 10 degrees off level, thenturn the TAC-92C power ON and observeCross Level drive while the antenna is

initializing. Does the antenna drive properly inCross Level?

No CrossLevel drive.

CLD1.2

CLD1.2 No Cross Level drive or drive is notconsistent




No

YesRotate the pedestal through ~60 degreerange of Cross-Level motion (tilt). Theantenna should rotate freely and easily with

light finger pressure. Do the Cross-Levelbearings rotate freely with no binding inCross-Level?

No Contact Sea Tel Service

department

Yes Re route or tie cables on theAssure that the cables on the pedestal are not


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Series 94 Troubleshooting Guide CLD



CLD1.3 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)

CLD1.7

Check the DC Voltage on J7 and J8, from pin3 to ground and pin 4 to ground.

+12.0 VDC OK?

No, voltage isgood on J7but missing on

J8


CLD1.4 Motor (M2) Continuity


P8-1 to P8-3 or 4 ~25Ù

P8-2 to P8-3 or 4 ~25Ù

P8-5 to P8-3 or 4 ~25Ù

P8-6 to P8-3 or 4 ~25Ù

P8-1 to P8-2 ~50Ù

P8-5 to P8-6 ~50Ù


No Motor open - Replace motor and re-check







P8 6 d O

No CLD1.5


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Yes Repair and re-checkCheck continuity from:






P7-1 to P7-2 = Open

P7-1 to P7-4 = Open


P7-2 to P7-4 = Open

P7-2 to P7-5 = Open

P7-2 to P7-6 = Open

P7-4 to P7-5 = Open

P7-4 to P7-6 = Open

P7-5 to P7-6 = Open

Is harness shorted?

No

Yes CLD1.1CLD1.5.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. IsCross Level drive restored? No Contact Sea Tel Service

department

CLD1.6 Cross Level drives wrong direction

YesVerify motor wire color code to P8 per Pedestal Harness Schematic. Is the P8 wiredcorrectly?

No Replace motor and re-check


39/248

Series 94 Troubleshooting Guide CLD


Yes TB2 short - Repair/replace

TB2, then CLD1.7.2

Disconnect P7 from TB2 and check +12VDC

from P4 pin 4 to ground. Is the +12.0 VDCOK? No

Yes Harness open/short –CLD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No CLD1.7.4

Yes CLD1.7.2Turn TAC-92C power OFF and reconnect P1,P7 and P8. Turn TAC-92C power ON and re-check DC voltage from J7 and J8 pin 3 to

ground and pin 4 to ground. Is the +12.0 VDCOK?

No Pedestal Harness short –Isolate shorted wire(s) or component(s), repair and re-check

CLD1.7.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then CLD1.8

Check DC voltage from P2-15 to groundunder load. This may also be done by opening the backshell of P2 to access pin 15


No



No


Monitor the voltage from P2-15 to ground andunplug P1 from PCU. Is the voltage +24VDCor greater when PCU P1 is unplugged?

NoYes PCU short – replace PCU,

then CLD1.8Unplug P2, remove the 15-Pin In-Line Test-Point connector from PCU and check thevoltage from P2-15 to ground Is the voltage No


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Yes CLD1.8Re-insert the voltage select block (assure it is

in the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then CLD1.8

Yes > 11VDC Re-test CLD1.1CLD1.8 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J7

and J8 pin 3 to ground and pin 4 to ground. Isthe +12.0 VDC OK now?



41/248

Series 94 Troubleshooting Guide CLR


CLR1.0 Cross Level Rate Sensor

CLR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to either stop wheninitializing.

2. Antenna does not stabilize in Cross Levelaxis properly.

3. Antenna may oscillate in Cross-Level fromone end stop to the other end stop.


Fig 1 Cross-Level rate sensor andconnection.


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CLR Series 94 Troubleshooting Guide


YesRefer to figure 1. Is the IDC connection (P6)

mated properly in the rate sensor? No Re-mate connection and re-check

Yes Repair and re-check. Are any wires in the IDC connector (P6)broken or frayed? No

Yes Tighten the three Philipsscrews to secure themounting plate to thepedestal and re-check.

CLR1.2.5 The rate sensor must be firmly mounted to thepedestal. Grip the body of the rate sensor with thumb and forefinger of one hand whileholding the level cage firmly in the other hand.

Gently wiggle the rate sensor. Is themounting plate loose on the pedestal?

No

YesCLR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and forefinger of one handwhile holding the pedestal firmly in the other hand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No CLR1.5


Remove the three Phillips screws that attachthe mounting plate to the pedestal, tighten therate sensor mounting screws and re-check. Isthe rate sensor still loose on the mountingplate?

No Re-install the mounting plate(and rate sensor) on thepedestal and re-checkCLR1.2.5

Yes Remove the PCB, trim leadsor replace spacers and re-install. The tilt sensor may be

damaged TILT1.0

CLR1.2.7 Refer to figure 2. Inspect the tilt sensor PCBto assure that the leads on the under-side of the PCB are not shorted to the level cage

enclosure (there should be three plasticspacers between the PCB and the aluminum). Are any leads shorted?

No

YesRefer to figure 2. Inspect the two 5-pin IDC


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Series 94 Troubleshooting Guide CLR


CLR1.4 Harness continuity

YesCLR1.4.1 Disconnect P1 & P6 and check continuityfrom:

P6-1 to P1-5 = Short


P6-5 to P1-44 = Short (through TB1)

Is continuity good?





P6-1 to P6-4 = Open

P6-1 to P6-5 = Open

P6-4 to P6-5 = Open

Is harness shorted?

No

Yes CLR1.1CLR1.4.2

Were repairs made to the harness in theprevious three steps? No

CLR1.5 Nominal output voltage

Reconnect P1 and P6. Turn TAC-92C power ON

Assure that the boat is not moving at the pier.The pedestal is not to be rotated (tilted left-right) while monitoring the rate sensor output

voltage (rate sensor not being rotated in freespace).

YesMonitor the rate sensor output DC voltagefrom P6 pin 4 to ground. Nominal when the No CLR1 7


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CLR Series 94 Troubleshooting Guide


Yes CLR1.4.1, then re-check

CLR1.5

Disconnect P1 from the PCU and check the

DC voltage from J1 pin 44 to ground. Is the+12VDC OK? No Replace PCU and re-check

CLR1.5

Yes CLR1.9CLR1.8 Re-connect P1 and turn TAC-92C ON. Gripthe rate sensor with your finger and thumband gently rotate (up/down) the rate sensor.Does Cross-Level drive the pedestal inresponse to rotation of the rate sensor?

No CLR1.4.1, then next

Yes Re-check CLR1.5Were repairs made during the harnesscontinuity checks? No Replace PCU and re-checkCLR1.8

YesCLR1.9 Turn TAC-92C OFF. Tighten the three Philipsscrews to secure the rate sensor mountingplate to the pedestal. Re-install theconductive tape over the rate sensor IDCconnection. Assure that the tape does notshort any of the wires in the IDC connector

and does not short the body of the rate sensor to the pedestal ground or the harnessshield/braid. Re check CLR1.3. Is the ratesensor isolated from ground?

No Re-tape and re-check

Reconnect P1 to the PCU and turn TAC-92Cpower ON

Return


45/248

Series 94 Troubleshooting Guide COMP


COMP1.0 Remote Compensation Failure

Access “Remote Comp” selection of theremote parameters of the TAC-92C.

Press UP arrow key, then the ENTER key.Display will read “Please Wait”

Compensation will take about two minutes.During this time the antenna will measure themagnetic deviation while slowly rotating in

azimuth. When finished the results will bedisplayed.

YesCOMP1.1 Does the display read “Comp Complete”?

No COMP1.2

Press MODE twice to display “RemoteParameters”. Press the UP arrow key thenpress the ENTER key to save thecompensation values to NVRAM in the PCU.

Return

Yes FLUX1.0, if FLUX has beenfollowed and the error persists then COMP1.2.1

COMP1.2 Does the display read “Comp Range Error “?

No COMP1.3

Yes COMP1.4COMP1.2.1 This error may be due to excessive magneticdisturbances. Is the antenna within 6 feet of large metal masses or magnetic fields fromspeakers or large Radar motors?

No

Yes COMP1.5Is the boat steel hull/super-structure?


YesCOMP1.3 Does the display read “Comp Gain Error ”?


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ELD Series 94 Troubleshooting Guide


ELD1.0 Elevation Drive problems

Refer to the Antenna System Schematic andthe Pedestal Harness Schematic drawings for all voltage and continuity checks.

YesELD1.1 Does the level cage drive properly?

No LEV1.0

Yes Return

Yes, Elevation

drives but notconsistently

ELD1.3

No, Elevationdrives thewrongdirection.

ELD1.7

ELD1.2 Test Elevation drive to determine the nature of the drive problem. Turn the TAC-92C power ON, turn tracking OFF (press AUX1).Observe level cage & elevation drive while theantenna is initializing, or while stepping,slewing or targeting azimuth. Does theantenna drive properly in elevation?

No Elevationdrive.

ELD1.3

ELD1.3 No Elevation drive or drive is not

consistent




No

YesRotate the pedestal through 90-degree range

of Elevation motion. The antenna shouldrotate freely and easily with light finger pressure. Do the Elevation bearings rotatefreely with no binding in Elevation?



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Series 94 Troubleshooting Guide ELD



ELD1.4 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)or missing

ELD1.8

Check the DC Voltage on J10 and J11, frompin 3 to ground and pin 4 to ground. Is the+12.0 VDC OK?

No, voltage isgood on J10

but missing onJ11


ELD1.5 Motor (M3) Continuity


P11-1 to P11-3 or 4 ~25Ù

P11-2 to P11-3 or 4 ~25Ù

P11-5 to P11-3 or 4 ~25Ù

P11-6 to P11-3 or 4 ~25ÙP11-1 to P11-2 ~50Ù

P11-5 to P11-6 ~50Ù


No Motor open - Replace motor and re-check.






P11 4 to ground = Open

No ELD1.6


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Yes Repair and re-checkCheck continuity from:





P10-1 to P10-2 = Open

P10-1 to P10-4 = Open


P10-2 to P10-4 = Open

P10-2 to P10-5 = Open

P10-2 to P10-6 = Open

P10-4 to P10-5 = Open

P10-4 to P10-6 = Open

P10-5 to P10-6 = Open

Is harness shorted?

No

Yes ELD1.1ELD1.6.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. Is

Azimuth drive restored? No Contact Sea Tel Servicedepartment Sea Tel Servicedepartment

ELD1.7 Elevation drives wrong direction

YesVerify motor wire color code to P11. Is theP11 wired correctly? No Replace motor and re-check


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Series 94 Troubleshooting Guide ELD


Yes TB3 short - Repair/replace

TB3, then ELD1.8.2

Disconnect P10 from TB3 and check +12VDC

from P10 pin 4 to ground. Is the +12.0 VDCOK? No

Yes Harness open/short –ELD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No ELD1.8.4

Yes ELD1.8.2Turn TAC-92C power OFF and reconnect P1,P10 and P11. Turn TAC-92C power ON andre-check DC voltage from J10 and J11 pin 3

to ground and pin 4 to ground. Is the +12.0VDC OK?

No Pedestal Harness short –Isolate shorted wire(s) or component(s), repair and re-check

ELD1.8.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then ELD1.9

Check DC voltage from P2-15 to groundunder load. This may also be done by opening the backshell of P2 to access pin 15


No



No


Monitor the voltage from P2-15 to ground andunplug P1 from PCU. Is the voltage +24VDCor greater when PCU P1 is unplugged? No

Yes PCU short – replace PCU,then ELD1.9

Unplug P2, remove the 15-Pin In-Line Test-Point connector from PCU and check thevoltage from P2-15 to ground. Is the voltage No


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Yes ELD1.9Re-insert the voltage select block (assure it is

in the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then ELD1.9

Yes > 11VDC Re-test ELD1.2ELD1.9 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J10

and J11 pin 3 to ground and pin 4 to ground.Is the +12.0 VDC OK now?



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Series 94 Troubleshooting Guide ELR


ELR1.0 Elevation Rate Sensor

ELR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to either stop after a brief stop at the correct Elevation when initializing.

2. Antenna does not stabilize in Level(Elevation) axis properly.

3. Antenna may oscillate in Elevation from theupper end stop to the lower end stop.


Fig 1 Elevation rate sensor and connection.


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ELR Series 94 Troubleshooting Guide


Yes Re-install in correct

orientation

ELR1.2.3 Refer to figure 1. If the rate sensor is installed

backwards (connector toward the right end of the level beam), the antenna may oscillatefrom one Elevation stop to the other. On the2494 (only) pedestal the rate sensor ismounted on the Cross-Level driven sprocket,all other models are as shown below. Is therate sensor mounted in the correctorientation?

No

ELR1.2.4 Remove the conductive tape from the rate

sensor. Save tape to reinstall later.YesRefer to figure 1. Is the IDC connection (P9)

mated properly in the rate sensor? No Re-mate connection and re-check

Yes Repair and re-check. Are any wires in the IDC connector (P9)broken or frayed? No

Yes Tighten the three Philips

screws to secure themounting plate to the levelbeam and re-check.

ELR1.2.5 The rate sensor must be firmly mounted to the

level beam. Grip the body of the rate sensor with thumb and forefinger of one hand whileholding the level beam firmly in the other hand. Gently wiggle the rate sensor. Is themounting plate loose on the level beam?

No

YesELR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and forefinger of one handwhile holding the level beam firmly in the other hand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No ELR1.5


Remove the three Phillips screws that attachthe mounting plate to the level beam tighten


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Series 94 Troubleshooting Guide ELR


ELR1.3 Rate sensor isolation

YesRemove the conductive tape and checkcontinuity from the metal body of the ratesensor to pedestal ground (=Open). Is therate sensor still shorted to pedestal ground?

No Tape was shorting – re-checkELR1.2.2

Yes ELR1.4.1, then re-checkELR1.2.2

Remove the three Philips screws to detachthe mounting plate (and rate sensor) from thelevel beam. Is the rate sensor still shorted topedestal ground?

No Screws were shorting - Next

Yes Replace the rate sensor mounting plate and re-check.Tighten the rate sensor mounting screws andre-check. Is the rate sensor still loose on themounting plate? No Re-check ELR1.2.2

ELR1.4 Harness continuity

YesELR1.4.1 Disconnect P1 & P9 and check continuityfrom:



P9-5 to P1-43 = Short (through TB2)

Is continuity good?






P9-1 to P9-4 = Open


Is harness shorted?

No


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ELR Series 94 Troubleshooting Guide


ELR1.6 Output voltage varies with motion

Yes ELR1.8Loosen the three Philips screws securing therate sensor mounting plate, grip the ratesensor with your finger and thumb and gently“wiggle” (rotate fore/aft) the rate sensor whilecontinuing to monitor the output voltage. CW(Backward) rotation should cause the outputto increase above 2.50VDC and CCW(Forward) rotation causes the voltage todecrease below 2.50 VDC. The amount of increase, or decrease, from nominal isproportional to the rate of rotation. Does theoutput vary as the rate sensor is rotated?

No Replace rate sensor and re-check

Yes Replace rate sensor and re-check ELR1.5

ELR1.7 Measure the DC voltage from P9 pin 5 toground (metal body). Is the 12 VDC OK?

No

Yes ELR1.4.1, then re-checkELR1.5

Disconnect P1 from the PCU and check theDC voltage from J1 pin 44 to ground. Is the

+12VDC OK? No Replace PCU and re-checkELR1.5

Yes ELR1.9ELR1.8 Re-connect P1 and turn TAC-92C ON. Gripthe rate sensor with your finger and thumband gently rotate (fore/aft) the rate sensor.Does Elevation drive the pedestal in responseto rotation of the rate sensor?

No ELR1.4.1, then next

Yes Re-check ELR1.5Were repairs made during the harnesscontinuity checks?

No Replace PCU and re-checkELR1.8

YesELR1.9 Turn TAC-92C OFF. Tighten the three Philipsscrews to secure the rate sensor mounting No Re tape and re check


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Series 94 Troubleshooting Guide ENC


ENC1.0 Encoder failure

Common failures are;

1. Frequently/Constantly lit unwrap LED onthe TAC-92C.

2. Pedestal won’t drive to the CW stop duringinitialization. OR Pedestal drives to the CCWstop after initialization.

ENC1.1 Test – Best test is to observe initialization of the antenna (azimuth phase). After

initialization of the antenna the unwrap LEDshould not be frequently, or constantly, lit andthe TAC-92C display of the relative position of the antenna should readout from 095 (whereCCW unwrap should occur) to 625 (whereCW unwrap should occur).

ENC1.2 Turn TAC-92C power OFF and disconnectencoder connector (P3). Check pins for corrosion or residue. Clean pins as needed

and re-connect.Yes ENC1.3ENC1.2.1 Rotate the pedestal and verify that the shaft of

the encoder turns freely. Does the encoder shaft turn smoothly?

No

Yes Reposition encoder for proper belt tension

Check belt tension to the encoder sprocket.When the pedestal is rotated the belt shouldnot slip on the sprocket. Does the belt slip onthe encoder sprocket?

No

Yes Adjust mounting position of the encoder awayfrom the belt. Rotate the shaft of the encoder.Does the shaft turn freely?

No ENC1.7

Yes Tighten set screw in theCheck sprocket on shaft of the encoder. Is


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ENC Series 94 Troubleshooting Guide


ENC1.6 Turn TAC-92C power OFF. Disconnect P3

from the encoder and P1 from the PCU.

Yes Repair, and re-test harnessCheck continuity:

From P3-1 to P1-33 ~ Short

From P3-2 to P1-16, 17 & 31 ~ Short



Are any open lines?

No

Yes Repair, and re-test harnessCheck continuity:

From P3-1 to P3-2 ~ Open



From P3-2 to P3-3~ Open



Are there any shorted lines?

No Replace PCU and re-test

Yes Contact Sea Tel Servicedepartment Sea Tel Servicedepartment

ENC1.7 Antennas shipped after January 1997 do NOThave encoders. These (current) antennaskeep track of the relative position of theantenna by counting steps issued to theazimuth motor. When the encoder in an older system fails Sea Tel recommends installationof new PCU to convert to “encoder-less”operation rather than replacing the encoder.Is “encoder-less” operation desired?

No Replace encoder and re-test


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Series 94 Troubleshooting Guide ERR


ERR1.0 Error Codes

When the TAC-92C Error LED is lit, pressmode to access the numeric value of the error in the error code display. The error codedisplay is comprised of two values LLLL andRRRR, where LLLL is a communicationscounter that is not used in these systems andthe RRRR display is the value of the systemerror(s). The error code display does NOTrepresent multiple occurrences of the same

error (0003 is NOT three 0001s). Thenumeric value displayed is the SUM of theindividual (different) errors that have occurred(0003 = error 0001 plus error 0002).

Note the error code value and determinewhich error(s) it represents. To clear theerror(s), press the UP arrow key while in theerror code display mode, or press the RESETkey. Errors should be noted, cleared and the

system monitored for frequency of re-occurrence.

A frequent (or constant) error is an indicationof a system failure. Troubleshoot each error individually.

ERR1.1 Error code 0001 – Gyro read error. ERR2.0

ERR1.2 Error code 0002 – Wrong SynchroConverter Type error.

ERR3.0

ERR1.3 Error code 0004 – Communications (ACU-PCU) error.

ERR4.0

ERR1 4 Error code 0008 – Reserved ERR5 0


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ERR Series 94 Troubleshooting Guide


ERR2.0 Error Code 0001 – Gyro Read Error

YesERR2.1 Clear this error and monitor the system for re-occurrence. Does this error re-occur? No Return

ERR2.2 Type of Ships Gyrocompass output

Verify the type of Gyrocompass signal that isbeing used as the “Ships Heading” input tothe TAC-92C

Yes ERR2.3Is NMEA 0183 Heading input being used?

NoYes ERR2.4Is Step-By-Step (SBS) Heading input being

used? No

Yes ERR2.5Is Synchro Heading input being used?

No

Set Gyro Type parameter to 0000.

Press MODE repeatedly until “Save

Parameters” is selected. Press the UP arrow,then press ENTER to save the new System &Gyro Type parameter values.

ERR2.1

ERR2.3 NMEA Heading Gyrocompass/ExternalFluxgate input

RS-422 ASCII Data wired to J13 ASPA porton the rear of the TAC-92C. The ASCII Datainput string must contain standard HDM or HDT ID text strings.

YesERR2.3.1 Is the TAC-92C Software version 2.53 or higher? No Contact Sea Tel Service

department


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Yes ERR2.3.4ERR2.3.2 Verify that the RS-422 Data is getting to the

Terminal Mounting Strip connections to theTAC-92C ASPA PCB (may require anOscilloscope). Is the Data input OK?

No

Yes Repair wiring to the ACU re-test ERR2.1

ERR2.3.3 Verify the RS-422 Data at the Gyrocompassoutput. Is the Data output OK at theGyrocompass? No

YesCheck output fuse/switch for the output line.Is the fuse/switch OK? No Replace fuse/turn switch ON

and re-test ERR2.1Repair the Gyrocompass and re-testERR2.3.2.

YesERR2.3.4 Observe NMEA LED on the ASPA PCB thatthe Gyrocompass input is connected to. Isthe NMEA LED rapidly flashing?

No Replace ASPA PCB and re-check

Yes ERR2.1Is the Ships Heading display correct?

No Replace Main PCB and re-check

ERR2.4 SBS Gyrocompass input (6 step/degree)


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YesVerify phase voltage does switch as the boat

turns. Does the phase voltage switch to low? No ERR2.4.4Yes ERR2.4.5Is the low state voltage approximately 0VDC?

No ERR2.4.4

Yes Replace Main PCB, verify allparameters, then ERR2.1

ERR2.4.4 Disconnect ribbon cable from the ACU and re-test 2.4.3. Are the phase voltage levels andswitching correct with the ACU disconnected? No

Yes At the Gyrocompass distribution box, checkoutput fuse/switch. Is the fuse/switch OK?

No Replace fuse/turn switch ONthen next

Yes Reconnect all connectionsand re-test ERR2.1

Check output terminals in the distribution boxterminals. Are the phase voltage levels andswitching correct? No Repair Gyrocompass and re-

check

Yes Repair Gyrocompass and re-test ERR2.1

ERR2.4.5 Monitor the A, B & C Phase lines with anoscilloscope. Are there voltage spikes or noise on any of the lines?

NoYes Replace Main PCB, verify allparameters, then ERR2.1

Monitor voltage inputs to the opto-isolatorscircuits on the main PCB. R7 is A phase, R5is B phase and R3 is C phase. Are the phasevoltage levels and switching correct?

No Repair/replace ribbon cableand re-test ERR2.1

ERR2.5 Synchro Gyrocompass input


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ERR Series 94 Tr

series 94 troubleshooting

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