Sharp SJ-C20 SL Series User manual

SERVICE MANUAL
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
CHAPTER 1. SPECIFICATION
CHAPTER 2. DESIGNATION OF VARIOUS PARTS
[1] EXTERNAL DESCRIPTION........................... 2-1
2-2...............................SNOITCURTSNOC]2[ .........
CHAPTER 3. DIMENTIONS
[1] OUTER DIMENTIONS AND
3-1........................................ECNARAELC .........
[2] INNER DIMENTIONS .................................... 3-2
CHAPTER 4. LIST OF ELECTORICAL PARTS
CHAPTER 5. WIRING DIAGRAM
[1] WIRING DIAGRAM ........................................ 5-1
[2] ELECTRIC ACCESSORIES LAYOUT ........... 5-2
CHAPTER 6. FAILURE DIAGNOSIS
[1] OUTLINE OF CONTROL ............................... 6-1
[2] CHECK MODE OF DEFROST HEATER
(Forced Defrosting) ........................................ 6-1
[3] RE-SETTING OF MICROCOMPUTER AT
POWER FAILURE.......................................... 6-1
[4] DIAGNOSIS METHOD OF FAILURE ............6-2
[5] CONVERSION TABLE ..................................6-3
[6] CIRCUIT DIAGRAM OF MAIN PWB .............6-4
CHAPTER 7. FUNCTIONS
[1] ADJUSTABLE TEMPERATURE
CONTROL .....................................................7-1
CHAPTER 8. ASSEMBLI NG PROCEDURES OF
MAIN PARTS AND CAUTIONS
[2] R CONTROL COV. ASS'Y.............................8-4
[3] HOW TO REPLACE THE LAMP ...................8-6
[4] DEFROST HEATER ......................................8-7
CHAPTER 9. COOLING UNIT
[1] COOLING UNIT.............................................9-1
[2] LOCATION ....................................................9-2
Parts Guide
CONTENTS
SJ-C19SS/C20XX
No.S1042SJ17GHZTT
Refrigerator-freezer
MODELS
SJ-C19SS-SL/SLG/GR/BL
SJ-C20XX-SL
Refer to "HFC-134a COOLING UNIT" Service Manual for handling this refrigerant.
Refrigerant; HFC-134a
DESTINATION.........T
[1] F-LOUVER ASS'Y .........................................8-1
[3] PRECAUTIONS FORUSING LEAD-FREE
SOLDER......................................................... 5-3
SJ-C20XX SJ-C19SS

35
1 – 1
CHAPTER 1. SPECIFICATION
RATING
Outer dimensions Height
"
Depth
Rate gross volume Total
Freezer
Refrigerator
Defrosting System
Start
Finish
Freezer Compartment F-shelf
Ice cube tray
Ice storage box
Door pocket
Refrigerator Compartment Fresh case
RV-glass shelf ass’y
Vegetable case
Egg pocket
Bottle pocket
Door pocket
1
1
1
Automatic (Adjustable)
Yes
1 (LED)
2-Door
Heater system
Automatic
Automatic
1
1
1
1
1
Items
Type
No-frost freezer
Interior lamp
Evaporating pan
Temperature control
SJ-C19SS
Rated voltage (V~)
Rated frequency (Hz)
Climate class
Rated power input (W)
Rated current (A)
Rated input of heating system (W)
Defrosting input (W)
Net Weight (kg)
Items
Refrigerant (Charging quantity) [Non-flammable]
50
T
101
0.85
121
121
HFC-134a(70 g)
220
Insulation blowing gas [Flammable]
Cyclo pentane (HC)
1
Deodorizer unit 1 (Honeycomb type)
1
1365mm(53.7")
535mm(21.1 )
560mm(22.0")
167liter(5.9cu.ft)
36liter(1.3cu.ft)
131liter(4.6cu.ft)
3
Width
RV shelf
SJ-C20XX
SJ-C19SS SJ-C20XX
-
37
-
3
COLOR
Items -SL
Outside color Silver
Inside color White
PLUG TYPE
Plug cord 2 pin
Plug type -
Destination mark T
-BL
Blue
-SIL
Silver
-GR
Green
SJ-C19SS/C20XX

2 – 1
.TSILSTRAPTNEMECALPERehtnidesusnoitanimonedehtera"]["sisehtnerapnisemanehT
SJ-C20XX
1
2
14
3
9
13
12
11
8
7
6
4
5
16
15
14
17
13
1. Freezer shelf [ F-shelf ]
2. Ice cube tray
3. Ice cube box [ Ice storage box ]
4. Freezer temp.control knob
5. Fresh room
6. Express ice making button
7. LED Light [ Lamp ]
8. Refrigerator temp.control knob
9. Refrigerator shelf
[ RV glass shelf ass’y SJ-C20XX ; 2 pcs.
RV shelf SJ-C19SS ; 2 pcs. ]
11. Vegetable crisper [ Vegetable case ]
12. Stand
13. Magnetic door seal [ Door packing ]
14. Door pocket
15. Egg pocket
16. Light switch
17. Bottle pocket
CHAPTER 2. DESIGNATION OF VARIOUS PARTS
[1] EXTERNAL DESCRIPTION
10
10. Vegetable shelf
[ RV glass shelf ass’y SJ-C20XX
RV shelf SJ-C19SS ]
SJ-C19SS/C20XX

Fan motor
Def-thermistor
F-temp. control knob
R-temp. control knob
Evaporator
Defrost heater
Deodorizing unit
R-thermistor
PWB L ass'y
LED Lamp
Compressor
Starting relay
Protector
Evaporating pan
Mark : Cold air flow
Fuse ass'y
[2] CONSTRUCTION
Stand
2 - 2
LED PWB
Running capacitor
SJ-C19SS/C20XX

3 – 1
[1] OUTER DIMENTIONS AND CLEARANCE
1. SJ-C20XX
2. SJ-C19SS
(Unit:mm)
9
560
1032
535
1092
362
957
535
395
823
1365
6060
60
130
8
(Unit:mm)
1032
535
1092
362
957
535
395
823
1365
60
60
60
130
9
560
615
8
CHAPTER 3. DIMENTIONS
SJ-C19SS/C20XX

3 – 2
[2] INNER DIMENTIONS
(Unit:mm)
380
360
260
375 45
415
65
105
65
170
48
395
370
175
400
390
390
115
175
200
100
190
90
100
80
115
80
225
225
380
220
395 225
190 144 81
1. SJ-C20XX
2. SJ-C19SS
(Unit:mm)
380
360
260
375 45
415
65
105
65
170
48
395
370
175
400
390
390
115
175
200
100
190
90
100
80
115
80
225
225
380
220
395 225
190 144 81
SJ-C19SS/C20XX

4 – 1
Common
Aux. coil Main coil
ITEMS TYPE NAME RATING SPECIFICATIONS
R Thermistor
Defrost Thermistor
―
DC 5V
DC 5V
R0 = 6.4 k , B(0) = 3811
R0 = 6.4 k , B(0) = 3811
Thermo. fuse 12Y
Defrost heater ―220 - 240V 392 135W at 230V
Fan motor 3R00121 AC 200-240V,50Hz
Door switch SDKNA20101 250V 0.25A
125V 0.5 A
3 Terminals push-botton type
Compressor C-BZN100L5L 220-240V/50Hz Cooling capacity : 106 W (50Hz)
Main coil : 23.1
Aux. coil : 28.9
(at 75 °C)
Starting Relay PTH7M220 50/60 Hz 22 ± 4.4 (at 25 °C)
Overload
Relay(Protector) 4TM-189RHBYY-53 Open/ Close : 130 ± 5.0 / 61 ± 9.0°C
Main PWB FPWB-A706CBKZ 220-
240V ―
PXN-36D
250V 2A Working temp. : 76 °C
LED PWB FPWB-A709CBKZ 12V DC Maximum 100 mA , White LED
CHAPTER 4. LIST OF ELECTRICAL PARTS
Running Capacitor RC-EZA249CBZZ 400V 4 F
―
250V 20A

5 – 1
CHAPTER 5. WIRING DIAGRAM
[1] WIRING DIAGRAM
Be sure to replace the electrical parts with specified ones for maintaining the safety and performance of the set.
* Note : R-th assembly on LED PWB
*
SJ-C19SS/C20XX

5 – 2
[2] ELECTRIC ACCESSORIES LAYOUT
SJ-C19SS/C20XX

1. Employing lead-free solder
The PWB of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter
indicates the alloy type of the solder.
Example:
2. Using lead-free wire solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may result in cold soldered
joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40°C higher than tin/lead alloy solder, it is recommend that a dedicated bit is used, and that
the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage to the land of the PWB, extreme
care should be taken not to leave the bit in contact with the PWB for an extended period of time. Remove the bit as soon as a good flow is achieved.
The high content of tin in lead free solder will cause premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the
iron when it is not required.
Leaving different types of solder on the bit will cause conta
mination of the different alloys, which will alter their characteristics, making good soldering
more difficult. It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be taken to clean
the bit thoroughly after each use.
Indicates lead-free solder of tin, silver and copper
[3] PRECAUTIONS FOR USING LEAD-FREE SOLDER
5 - 3
SJ-C19SS/C20XX

6 – 1
1. ON/OFF Control of Compressor
• ON/OFF of the compressor will be controlled depend on the temperature detected by the R-thermistor . (Normal cooling control)
• When the rapid ice making is requested by user during the operation, the compressor will be ON and cooling operation will be started
regardless of the detected temperature by the thermistors. However, if requested during the defrosting operation, the request will be executed
after the completion of defrosting and ON of the compressor might be delayed.
• During 5 minutes after the compressor stops, it will not start regardless of the detected temperature by R-the
rmistor.
2. Defrosting
Microcomputer calculates the appropriate timing of defrosting and defrosting is made automatically. Therefore no manual operation by user is
required. The cycle of defrosting varies depend on the usage condition of the refrigerator. (Maximum time about 50 hours, minimum time 40 minutes.)
3. Thermistor
Thermistors are installed in 2 places; in the refrigerator , and close to the Evaporator. (R-thermistor, Def-thermistor)
R-thermistor detects the temperature in the refrigerator compartment respectively and controls ON/OFF of compressor.
Def-thermistor detects the temperature around the evaporator and shows the progress of defrosting.
•At the power failure for over 0.25 second, the control of the microcomputer will might be reset.
•Microcomputer might continue to operate for approximately 10 seconds maximum at power failure depending on the load at the operation. Approx-
imately 30 seconds is necessary for the definite power OFF condition.
•When the power is re-supplied, the normal cooling will be resumed.(If cold enough in the cabinet, the microcomputer will begin defrosting in 40
minutes according to the condition.)
•The temperature and operation mode set by user will be maintained even if a power failure occurred.
(However defrosting, rapid ice making, and timer will not be maintained.)
The operation of the defrost heater can be checked by starting it.
In case the failure of defrosting is suspected, this is an effective inspection method.
1. Starting Method
At the power OFF condition.
1) Keep the door of the refrigerator compartment open
.
2) Set the Temp. Control Knob in the refrigerator compartment to the center position.
3) Keep the door open and supply power source.
2. Normal Operation
1) Approximately 3 seconds after power supply, the relay on the PWB will be turned ON and the defrost heater will be electrified for 5 seconds.
2) After 5 seconds, if the temperature of Def-thermistor reaches high enough (over 10°C) and judged as defrosting completion, the compressor will be
wait 5 seconds before runs for 5 minutes and then returns to the normal contro
On the other hand, if the temperature of Def-thermistor is still low (under 10°C), the defrost heater will be electrified until the temperature of Def-
thermistor reaches the specified temperature or higher.
After completion of electrification, the compressor runs for 5 minutes and then returns to the normal cont
rol.
* In the case that any abnormality in Door Switch, Volume, R-thermistor or Def-thermistor, or the Temp. Control Knob is not in the position corre-
sponding to the value of the rating voltage settled to the PWB itself, this mode will not be entered nor the defrost heater is electrified.
(Center)
CHAPTER 6. FAILURE DIAGNOSIS
[1] OUTLINE OF CONTROL
[2] CHECK MODE OF DEFROST HEATER (Forced Defrosting)
[3] RE-SETTING OF MICROCOMPUTER AT POWER FAILURE
SJ-C19SS/C20XX

6 – 2
Check by the following procedure;
1. Disconnect power supply and check the following point.
• Is there any failure portion in inserting connectors?
2. Detach the PWB and check the appearance.
• Is there any burning or abnormal damage?
3. Check the conditions of the fuse and the varistor. (Fuse and varistor are located at the position in the figure.)
• Melting in the fuse cannot be checked visually (as the safer one than transparent glass tube is used). Be sure to detach the connector “CN1”
before measuring the resistance between the both ends of the fuse by the tester.
• Next, measure the resistance va
lue between the both leads of the varistor.
4. Check whether the temperature (resistance value) shown by R-thermistor is correct or not. (Refer to the table below.)
• Detach the connector “CN3” on the PWB and measure the resistance value between 2 and 4 pins.
5. Check whether the temperature (resistance value) shown by Def-thermistor is correct or not. (Refer to the table below.)
• Detach the connector “CN2” on the PWB and measure the resistance value between 1 and 2 pins.
Varistor→ Normal (several hundreds Ω~several KΩ egamaD)
Fuse↓
Melting
Flow of excessive current is considerable for some rea-
sons.
Check for any portion to cause short circuits especially
on the primary circuit.
There is a possibility of excessive voltage applied from out-
side with the factor such as thunder etc. When repeated
with a factor other than thunder, there might be the appara-
tus near by generating noises.
Conduction
Fuse and varistor are normal.
Possibility to be caused by excessive current or voltage
near the power supply is low. Proceed to the next check
item.
—
Varistor
F1(Fuse 8A)
F2(Fuse 1A)
CN3
CN2
CN1
[4] DIAGNOSIS METHOD OF FAILURE
SJ-C19SS/C20XX

6 – 3
Conversion Table between R-thermistor and Def-thermistor Temperature and Resistance Value
Temperature
(°C)
Resistance Value
(kΩ)
Temperature
(°C)
Resistance Value
(kΩ)
Temperature
(°C)
Resistance Value
(kΩ)
-25 26.1 -11 11.49 3 5.5
-24 24.54 -10 10.88 4 5.23
-23 23.08 -9 10.3 5 4.98
-22 21.72 -8 9.75 6 4.74
-21 20.46 -7 9.24 7 4.52
-20 19.27 -6 8.76 8 4.3
-19 18.16 -5 8.3 9 4.1
-18 17.13 -4 7.87 10 3.91
-17 16.16 -3 7.47 11 3.73
-16 15.25 -2 7.09 12 3.56
-15 14.4 -1 6.74 13 3.4
-14 13.6 0 6.4 14 3.24
-13 12.85 1 6.08 15 3.1
-12 12.15 2 5
.78
[5] CONVERSION TABLE
SJ-C19SS/C20XX