samsung rl23-25-28 dats datw service manual

7/25/2019 Samsung Rl23-25-28 dats Datw service manual

1/28

MODEL:RL23DATS RL23DATWRL25DATS RL25DATW

RL28DATS RL28DATW

C C

SERVICESERVI EMANUALNU

Electric Refrigerator CONTENTS

PREVENTIVE ACTIONS 1

PRODUCT SPECIFICATIONS 2

ELECTRIC & COOLING PART SPEC. & CRITERION 3

STRUCTURE 4

COOLING SYSTEM CYCLE WORKFLOW 5

DIAGRAM CIRCUIT 6

WORKING PRINCIPLE & TEST METHOD OF KEY PARTS 7

TROUBLE ANLYSIS & SHOOTING 10HOW TO CHANGE KEY PARTS 12

EXPLODED VIEW & LIST 14

21

CONTROL PANEL TROUBLE SHOOTING 24

CIRCUIT DETAILS


2/28

!

1

This represents the materials with regard to the A/C circuit and spare par t safety.

Prior to repair, please pull the plug out of the socket from the wall to disconnect the

power to hold the human and wealth harmless.

1-2-1.Direct plug in-and-out is recommended when replacing the relay that attaches to

the compactor lead terminal. When inserting and pulling the plug, relay wobbling

will more likely destroy the compactor terminals or relay.

1-2-2.Restart is not allowed within 5 minutes after power off. Immediate plug in-and-out

will disable the restart.

Do not make any by-pass or circuit change attempt without manufacturer's prior

suggestion.

No prelonged cable or double terminal board is recommended.

For human safety, this procut must be properly earthed. But phone lines and gas

pipes are not recommended for earthing.

!

1. PREVENTIVE ACTIONS

1-1 Safety Precautions

Only qualified technic ians who have full command and knowledge of thecooling system and safety inspect ion are allowed to deliver the maintenanceservice as specified on the manual.

Please be sure to keep the work place ventilated and safe as this productadopts the combust ible and explosive R600a refrigerant.

1-2 Preparations Before Maintenance

This represents the materials included in the appl iance maintenance.


3/28

2

2. PRODUCT SPECIFICATION

Polyurethane foam (141B)

1 (Refrigerating compartment)

2 (Rear)

2 (Head)

ABS


4/28

3

SPECItem

Model

Power AC 220V/50Hz

CompressorModel

Lube

Evaporator

Condenser

Drying filter

Capillary

Molecular sieve

SILK PIPE

Built-in

Temp.Control

Start up relay

Freeze

Refrigerating

Deputy evap

Initial resistance

Model

Model

SPEC

SPEC

SPEC

SPEC

SPEC

SPEC

ON temp

OFF temp

Earthing screw

Lamp

DC motor

E-magnetic valve

Door lightswitch

ID 0.72 L2800mm

Sensor 502AT

Sensor 502AT

Sensor 502AT

8100(ID A) 8100(ID B)

GQS70AA

ESTER OIL

3. SPEC. AND CRITERION OF ELECTRIC & COOLING PARTS

Cooling

cycle

Electricspa

reparts

Capacitor

Overloadprotector

11-19 9-16

B63-125T0455

70-55 70-55

120-130 120-130

DC 12V 0.08A

240V 25W

220V 0.5A / 125V 1.5A

COPPER SCREW BSBN

4uF,400V

SDF0.83/2-3B


5/28

G

C

B

E

D

A

F

J

K

H

I

5

4. STRUCTURE

4-1 Product size

Unit:mm

CODE

MODEL A B C D E F G H I J K

RL23DAT*

RL25DAT*

RL28DAT*

604

604

604

698.4

698.4

766.4

9

9

9

766.4

854.4

898.4

42.7

42.7

42.7

1570

1658

1770

616.5

616.5

616.5

1528

1616

1728

42

42

42

368.5

368.5

368.5

1188

1188

1188


6/28

silver welding rod soldering

silver welding rod soldering

flashsoldering (aluminium/braze)

5

5. COOLING SYSTEM CYCLE WORKFOLW

HOT-PIPE EVAP-REF,ASS'Y

ACCUMULATOR

R CAPILARY

EVAP-FRE ASS'Y

PIPE CLUSTER,L

DRYER

PIPE-SUCT CONNECT

COMPRESSOR

PIPE-DISCHARGE

ASSY VALVE BISTABLE

PIPE CONDENSER,R

F CAPILARY


7/28

6

AC220-240V~/50Hz

MAIN

CONTROLPCB

PANEL PCB

RED

FAN MOTOR

BLK

REF-SENSOR

R-EVAP SENSOR

F-SENSOR

DOOR SWITCH

YEL

WHT

BLU

RED

BRN

BLK

BLU

GRY

BRN

TRANSFORMERGRY

RED

RED

Y/GRN

EARTH BLU

RED

RED

RED

RED

LAMPW/BLK

YELVALVE-BISTABLE

CAPACTIOR

EARTH

COMPRESSOR

O/L RELAY

P.T.C RELAY

BRN-BROWN

GRY-GRAYBLU-BLUEBLK-BLACKWHT-WHITEYEL-YELLOWY/GRN-YELLOW GREENW/BLK-WHITE BLACK

6. DIAGRAM CIRCUIT


8/28

7

7-1 Compressor

7-2 Overload protector

7. WORKING PRINCIPLE & TEST METHOD ON KEY PARTS

The compressor motor, mounted directly to thecompressor and located inside a sealed steelcase, has two windings.One is a start winding and the other a run winding.The windings are connected together internally,forming a common connection. A lead is connectedto each of the windings, and to the commonconnection. These three leads are then connectedto glass-sealed terminals that extend through thecompressor case.The terminals are clustered in al trangle ( pyramid )pattern and, reading from left to right, are identified:Start, Common and Run.

1) Measure the resistance of each winding of thecompressor.

a. Disconnect the power cord. b. Remove the relay from the compressor. C. Measure the resistance of each winding.

A. The highest resistance value is the measurement of the "start" and "run" terminals whose windings are

connected in series.

B. The lowest resistance value is the measurement ofthe "run" and "common" terminals.

C. The mid-level resistancevalue is the measururementof the "start" and "common"

terminals. B + C = A

2) Measure each terminal andground with the ohmmetorset to the highest range.

If a winding is found to beeither open or shorted toground, the compressorhas failed.

Operating principle Inspection method

Compressor Windings


The overload protects the compressor motor byresponding to both the temperature and current.The overload protector is basically made up ofa set of the contacts normally closed and thebimetal element.

The overload, mounted externally and in directcontact with the compressor case, is connectedin series with both windings of the motor.If the motor fails to start for any reason, the heavylocked rotor current will cause the bimetal elementto heat which then quickly flex, snapping thecontacts open and interruption current flow throughthe motor.Likewise, if the motor overheate to an unsefe leval,the comination of current and temperature will causethe bimetal to snap the contacts open, On cooling,the bimetal flex back and snaps the contacts closed.The motor will continue to cycle on the overload so

long as the oriqinal reason for tripping persists

1) Check for continuity with ohmmetor. - If the overlosd is tripped, cheak continuity after

waiting until it has cooled, in the room ambientbefore checking.

- Even though the continuity of the overload isobserved it is difficult to confirm that the overloadis operating within the specification limits.

If there is any doubt, replace it with a part withidentical specifications.

: An overload should NEVER be by-passedin the circuit , not even as a temporarymeasure until the proper replacement canbe installed.


9/28


Unlike to other mechanical apparatus, this solidrelay has neither coils nor flexiable terminals.The relay is made of a solid wafer situatedbetween the terminal linked poles. This waferwill produce low resistance (5~23 ) underroom temperature.

When the compressor is initialized, the currentwill run through the Run winding group and theparralled relay as well as the Start winding group.

In the beginning, the increasing relay resistancewill lessen the current dramtically. The silmcurrent will keep the relay resistance high andthe relay open .This relay is called PTC (Positive Temperature

Coefficiency) relay as the resistance will go upwith the increasing temperature.This solid relay can also be tested by anohmmeter. The relay resistance tested underroom temperature must be within the range of10% of the norminal value indicated on thespecified circuit diagram.

7-3 Relay

8

TERMINALS

WAFER

` `


10/28

9

7-4 E-magnetic valve


The bistable two way T-piece e-magneticvalve is under the control of the pulsegenerator that outputs semi-wave DC pulsepower to scan the coils once every 30s~60swith 4~10 pluse semi-waves.

The e-magnetic will reverse with changingpluse direction.

EntranceExit 1

Exit 2

Connect the appliance to power, pressTEST key on the PCB:If pressing RF , the gateway is fromEntrance to Exit 2;If pressing FF , the gateway is from

Entrance to Exit 1.

```

`

``


11/28

10

8. TROUBLE ANALYSIS & SHOOTING

*Refer to the trouble analysis section of user s manual for non-faultreason.

Table 1: check and root out cooling system troubles

Table 2: circuit checksheet for irregular run

Drop a dirb of water on the evaporator tosee if it is iced after 20 minutes run.

Check the leaking place and addrefrigerant after vacuumizing.

Check

Item

Startup voltage

When other parts work well Damaged motor and compressor

PTC. relay

Compressor motor (deputywindings) conducting test

Broken wire Change compressor

Change compressor

Damaged Change relay

Too low voltage Voltage up (mount stablizer)

Reason Solution

Root out

`

`

Test oncompressworking status

Normal run

Run failure

Break down

No cooling

Temperaturesetting

Too low (set higher)

Malfunctional sensor

Loose gasket (clean soils or change it)

Evap. frost (defrost)

Change PCB andconfirm single

Change E-magnetic valve

Inferior cooling

Unable toshut Ref

Fre cooling No Ref cooling(under the normal mode)

E-magnetic reversionfailure or control single not found

E-magnetic reversionfailure or control single not found

Check the cooling system (see figure1)

Check the electric circuit (see figure 2)

Check the electric circuit (see figure 3)


12/28

Table 3: circuit checksheet for breakdown

Caution: If the compressor motor windings are burned up during operation, clean the

whole cooling system to leave out acid.

Item

Power supply cord & plug Broken and off wire Repair and change cord & plug

Reason Solution

PTC. relay

Overload protector Malfunctional terminal,internal broken wire

Change overload protector

Damaged Change relay

Compressor motor (deputywindings) conducting test

Change compressorOpen circuit of windings

11


13/28

12

9. HOW TO CHANGE KEY PARTS

9-1 Change the sensor

9-2 Change the Relay

9-3 Change the gasket

9-6 Change the display

9-4 Compressor & Dryer

9-5 Change the freeze evaporator

1. Remove the temperature sensor cover.

2. Take apart the sensor.3. Change the sensor.4. Put on the sensor cover.

1. Loosen the fixture to remove the relay cover.2. Take apart the relay.

Cut the compressor s pipes with a solder-torch-like cutter, dismantle the wires and screw offthe screws to change the compressor. Be aware to keep the pipe in good shape to avoid brocking.Leave6~8mm in the compressor when plugging in the pipes. When changing the dryer, cut off 30mm of the capillary and leave 10~20mm in the dryer. Afterthe soldering is finished, reacuumize and add liquid as required on the nameplate. Seal theprocess pipe in the end.

Take out the freeze drawer, remove the evaporator cover and turn off the screws. Cut openthe evaporator process pipe to discharge the refrigerant, burn up the binding pipes at theentrance and exit of the freeze evaporator and draw out the evaporator alongside the channel.Change the evaporator and reacuumize and add liquid as required on the nameplate. Seal theprocess pipe in the end.

Turn off the top frame screw, remove the top front cover and pull out the leads. Loosen thescrews in the display and take down the display for a change. Reassemable the display in thereverse order.

Dismantle and change the gasket.


14/28

9-7 Change the E-magnetic valve

1.Turn off the e-magnetic valve screws.2.remove the cover and the wires.3.cut open the compressor's process pipe to discharge cooling liquid, then solder the threeports of the e-magnetic valve with a soldering torch.4.change the e-magnetic valve.5.Reassemble the capillary and the drier as it was. Reacuumize and add liquid as required onthe nameplate.Seal the process pipe in the end

13


15/28

14

10. EXPLODED VIEW & LIST

10-1 Door


16/28

15

No Part number Description Q'ty Spec Remark


17/28

16

10-2 Compartment


18/28

17



19/28

15

10-3 General assembly


20/28

19



21/28

20



22/28

11. CIRCUIT DETAILS

11-1 Power Supply Part

220V

7812 7812

C104104

C1011000uF50V

C102170uF25V

C103100uF16V

12V

L.V.T

The AC input voltage will be stepped down by the transformer and be converted into the DC voltage

by the rectifying ci rcuit (D101-104). The 1000F/35V wave filter capac itor will be used to filter out the

residue AC voltage and the manostat 7812 is used to output the s teady 12V DC voltage that will beused as the control voltage of the relay and display. The 12V DC voltage will be regulated by the

manostat 7805 to output the steady 5V voltage, which will be used as the output vo ltage of the chip

peripheral circu it and various signals (sensor, switch) .

Power supply

Vcc (DC 5V)

Vcc (DC 12V)

Applied circuit

Contro l voltage of the display and relay

chip peripheral power and sensor, bimetallic thermostat , door switch voltate

11-2 Reset Circuit Part

The reset circuit part enables the system program to return the system that meets power

trouble or abrupt power-of f to the initial state by the memory of the core chip. At the very

beginning of the power-on, the reset chip voltage is LV, and becomes HV after normal

operation.

51951A

C202104

C203104

VccRESET

21


23/28

11-3 Sensor Part

M

I

C

O

M

C301104

C302104

C303104

Vcc

R3021K

R3041K

R3061K

R405 10K-F

R305 10K-F

R303 10K-F

R301 10K-F

Freeze Sensor

Refrigeratingsensor

Evaporatorsensor

The sensor is a temperature sensitive rheostat whose resistance goes up at high temperatureand drop down at low one. The sensor's resistance will vary with the changing tempeature andincur the voltage altering in chip to control the chip action.

Temperature Sensor's Resistance & Ronversion Table of Chip Input Voltage.

22

11-4 Operation Part

D603 D606 D609 D612 D615

D614D611D608D605D602

D601 D604 D607 D610 D613

1.OPTION circuit plays the role of adjusting the tempeature setting parameters.2.The OPTION circui t information may be read at the stage of initial self-diagnos is.3.You may adjust the temperature setting during maintenance by adding a diode on theOPTION circuit.The al tering of the Ref. & Fre. default temperature under the mode of Standard Run is setforth as below:


24/28

23

Refrigerating compartment

Freeze compartment

NO

NO

1

23

4

5

6

7

8

1

2

3

4

5

6

7

8

0

00

0

1

1

1

1

0

0

0

0

1

1

1

1

0

01

1

0

0

1

1

0

0

1

1

0

0

1

1

0

10

1

0

1

0

1

0

1

0

1

0

1

0

1

+1+2

+3

-1

-2

-3

-4

+1

+2

+3

-1

-2

-3

-4

D603 D602 D601 Setting Deviation

Setting DeviationD606 D605 D604


25/28

12-1 Sensor

12. CONTROL PANEL TROUBLE SHOOTING

24

1. Restart the appliance for a self-diagnosis before maintenance.

2. If self-diagnosis detects a faul t, please refer to the following tab le for faulty parts.

NO

1

2

3

ITEM

Refrigerating sensor

Refrigerating sensor

Deputy evaporator sensor

Deputy evaporator sensor

Freeze sensor

Temp. Temp. Temp. Temp.Voltage Voltage Voltage Voltage

Freeze sensor

DISPLAY REMARKS

3.The sensors' positions are individually set forth hereunder:

4.The sensor resistance and the chip leg voltage under varying temperature.

-35-34-33-32-31-30-29-28

-27-26-25-24-23-22-21-20-19-18-17-16

6815064710614805843055550528405023047770

454504326041190392403739035650339903243030920295002814026870

4.3604.3314.3014.2694.2374.2044.1704.134

4.0984.0614.0233.9853.9453.9053.8633.8223.7783.7343.6893.644

-15-14-13-12-11-10-9-8

-7-6-5-4-3-2-1 0 1 2 3 4

2565024510234202239021410204081958018730

179201716016430157401508014450138601329012740122201172011250

3.5973.5513.5043.4563.4083.3603.3103.260

3.2093.1593.1083.0573.0062.9552.9042.8532.8012.7502.6982.647

56789101112

131415161718192021222324

1080010370995995699195883984948166

785275527266699267316481624260135792558053795185

2.5962.5452.4952.4452.3952.3462.2962.248

2.1992.1512.1042.0572.0121.9661.9221.8781.8341.7911.7491.707

2526272829303132

333435363738394041424344

5000 4821 4650 4487 4329 4179 4033 3894

3760 3631 3508 3390 3276 3167 3026 2962 2864 2770 3680 2593

1.6671.6261.0591.5491.5111.4741.4371.401

1.3661.3321.2981.2661.2341.2031.1721.1431.1131.0851.0571.030


26/28

A. When the freeze sensor breaks down

Start

Is the mainboard connectorplug-in ok?

Are the mainboard sensorconnectors linked properly?

Is the input voltage on the core chip leg 26# ok?

Is the freeze temperaturesensor ok?

Change the temp.sensor

Plug in the connectoragain for bad contact.

Disconnect sensors

Check for miss or voldwelding, short circuit

Are PCB and temp. sensorok? Recheck the connector

N

N

N

N

Y

Y

Y

Y

B. When the refrigerating sensor breaks downStart

Is the mainboard connectorplug-in ok?

Are the ma in board sensorconnectors linked properly?

Is the input voltage on the corechip leg 30# ok?

Is the refrigerating temperatu resensor ok?

Change the temp.sensor

Plug in the connectoragain for bad contact.

Disconnect sensors

Check for miss or voldwelding, short circuit

Are PCB and temp. sensorok? Recheck the connector

N

N

N

N

Y

Y

Y

Y

25

12-2 When troubles are found by self-diagnosis


27/28

Y

Y

Y

N

Y

N

N

N

Start

Is primary voltage of thetransfo rmer ok ?

Is secondary voltage of

Transformer ok ?

Is display ok ?

Power on again

Normal

Check and repair the

wire assembly

replace the transformer

Repair or replace thedisplay

Replace the mainboard

subassembly

StablizerStablizer

the 7812 output DC12Vthe 7805 output DC5V

12-3 Responseless after power on

26

1. Prior to trouble settlement, check if the power socket is electrif ied and the connecting powersupply spec. is normal.

2. Check if the power botton on display is pressed or not .3. If other troubles are found, please refer to the remarks on the next page to make an

inspection.

Primary Inspection


28/28

samsung rl23-25-28 dats datw service manual

Documents