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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
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!
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.
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2
2. PRODUCT SPECIFICATION
Polyurethane foam (141B)
1 (Refrigerating compartment)
2 (Rear)
2 (Head)
ABS
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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
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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
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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
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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
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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
Operating principle Inspection method
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.
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Operating principle Inspection method
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
` `
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9
7-4 E-magnetic valve
Operating principle Inspection method
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.
```
`
``
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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)
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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
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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.
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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
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14
10. EXPLODED VIEW & LIST
10-1 Door
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15
No Part number Description Q'ty Spec Remark
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16
10-2 Compartment
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17
No Part number Description Q'ty Spec Remark
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15
10-3 General assembly
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19
No Part number Description Q'ty Spec Remark
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20
No Part number Description Q'ty Spec Remark
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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
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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:
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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
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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
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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
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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
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