Samsung RM255BABB Training Manual page 69

DIAGNOSTIC
FOR C/R-FAN
Is the vol t age DC 0-1V between GND of the
mai n -PCB secti o n and\ CN76 pi n No. 5?
Is the voltage DC5V between the main
PCB section CN No.9 and No.14?
Measure with the closed door.
- Door Open: DC 0V
- Door Close : DC 5V
FOR R-RAN
Does DC 0V al t ernate wi t h DC 12V between
GND of the mai n -PCB anf cn76pi n NO.5?
Reference
CN76 No. 3(C/F-FAN), pin no.6(C/R-FAN) will get pulse signals
which is generated when the motor rotates.
These signals will be inputted into MICOM.
Unless signals are not inputted in the motor operation, it will be ON
10 seconds after the fan OFF. But if signals are not still entered, the
above operation will be performed four times more. Without signals
entered continuously, the motor will get restarted after 10 minutes.
This function is effective to secure normal operation where the motor
would be restrained due to foreign matters such as ice. Ref
Is the COMP OFF State?
FOR C/F-FAN
Is the voltage DC 0-1V between GND of the
main-PCB section and CN76 pin No. 2?
NO
Is the voltage DC5V between the main PCB
section CN No.2 and No.7?
YES
Apply power around 5 minutes
after the power OFF. (to prevent
overload of compressor.)
FOR F-FAN
Does DC 0V al t ernate wi t h DC 12V between
GND of the mai n -PCB and CN76 pi n No. 2?
YES
Expected causes :
1. Fan motor has failure itself.
2. Wire connections have a trouble of contact.
3. Check : Input of the fan motor rotation pulse in operation of fan motor.
(See the details of Fan Motor Drive Circuit section.)
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Start
NO
Execute Forced operation.
YES
YES
NO
Fan works normally.
NO
Troubleshoot the connections
YES
In the first power application, the
freezer / refrigerator / compressor
fans work for 5 minutes regardless
of the condition.
NO
Exchange or troubleshoot the
YES
of door S/W.
main PCB.