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SJGC480VSL
[ 8 ] FAILURE DIAGNOSIS
1. OUTLINE OF CONTROL
1) ON/OFF Control of Compressor
ON/OFF of the compressor will be controlled depend on the temperature detected by the R-thermistor and
F-thermistor. (Normal cooling control)
In case the surrounding temperature is high at the power supply input, the compressor will be ON at once and the
normal cooling control will start after several hours.
• During 5 minutes after the compressor stops, it will not start regardless of the detected temperature by R-thermistor
and F-thermistor.
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 50 hours, minimum time 40 minutes)
It is possible to perform defrosting forcedly by turning ON the power with the door of the refrigerating room opened.
3) Thermistor
Thermistors are installed in 4 places; in the refrigerator and freezer compartment, and on the Main PWB and close to
Evaporator. (R-thermistor, Fthermistor,Outside temp-thermistor, Def-thermistor)
R-thermistor and F-thermistor reads the temperature in the refrigerator and freezer compartment respectively and
controls ON/OFF of the compressor and OPEN/CLOSE of the electrical damper.
Def-thermistor detects the temperature around the evaporator and shows the progress of defrosting.
Outside temp-thermistor reads the surrounding temperature of refrigerator. It changes the operation mode by the
outside temperature.
2. CHECK MODE OF DEFROST HEATER (Forced Defrosting)
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 or freezer compartment open.
2. Set both Temp. Control Knobs to the position shown in the figure.
3. Keep the door open and supply power source.
2) Normal Operation
1. Approximately 2 seconds after power supply, the relay on the PWB will be turned ON and the defrost heater will
be electrified for 10 seconds.
2. After 10 seconds, if the temperature of Def-thermistor reaches high enough (over 10°C) and judged as
defrosting completion, it returns to the normal control.
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, it returns to the normal control after 5 minutes.
* In the case that there is any abnormality in Door Switch, Potentiometer (Control knob), any thermistors, or the
Temp. Control Knob is not in the position corresponding to the value of the rating voltage settled to the PWB itself,
this mode will not be entered nor the defrost heater is electrified.
16
220-240V models
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