Failure Diagnosis; Outline Of Control; When The Defrosting Failure Is Doubtful - Sharp SJ-FS810V-WH Service Manual

[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.
• When the Express freezing 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 6 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 about 50 hours, minimum time 8 hours)
3) Thermistor
Thermistors are installed in 5 places; in the refrigerator and freezer compartment, and close to the Operation PWB
and Evaporator and the bottom of the ice tray. (R-thermistor, Fthermistor, Outside temp-thermistor, Def-thermistor,
Ice-thermistor)
R-thermistor and F-thermistor detects the temperature in the refrigerator and freezer compartment respectively and
controls ON/OFF of compressor.
Def-thermistor detects the temperature around the evaporator and shows the progress of defrosting.
Outside temp-thermistor detects the surrounding temperature of refrigerator. The microcomputer decide the
operation mode using the outside temperature.
Ice-thermistor detects the end of ice making, and water existence in Auto Ice maker.
4) Auto Ice Maker
• Automatic Ice maker operation
Water supply (Gear pump moves)
• Clear ice
An ice cube heater is heated and ice is made slowly.
• Water pipe heater
Freeze proofing of a water pipe.
• Tank heater
Freeze proofing of a water tank.
5) R room lamp
• R room lamp goes out, 60minutes after opening a refrigerating room doors. (for power supply circuit protection)

2. WHEN THE DEFROSTING FAILURE IS DOUBTFUL

Execute the Self-Diagnosis Mode. (Refer to the Chapter "SELF-DIAGNOSIS MODE")
• In case the diagnosis result is " E.03" (Def-thermistor system defect), follow up the flowchart of E.03. (In case of
any abnormity in the Def-thermistor, defrosting will not be made for safety reasons.)
• In case the diagnosis result is " E.07" (Defrost defect), follow up the flowchart of E.07.
(This diagnosis result will be displayed when defrosting is made for 120 minutes, the maximum time length. In
this case, the defect of PWB itself or also the breakage of heater or heater circuit (melt down of current fuse and
temperature fuse) are considerable.)
Ice -thermistor detects water existence
Releasing (Ice tray rotates)
13
Ice -thermistor detects the end of ice making
SJFS810VWH