4-2-10) When Fan Does Not Operate - Samsung RSG5D SERIES Service Manual

TROUBLE SHOOTING

4-2-10) When Fan does not operate

- This model has BLDC FAN motor. BLDC motor is driven by DC7~12V
- F-Fan motor usually runs together with the Compressor except the Cool Select Zone function is activated. Once the door
is open and closed at high ambient temperature, F-Fan motor put off its operation for one minute. Therefore, you are
advised not to take it as an error.
- When fridge door is open, the F-Fan motor stops together with R-Fan motor.
For C-FAN
The voltage
between GND in Main PBA and CN75
#2 is 8-12 VDC
NO
For C-FAN
The voltage between
GND and CN75 #2 repeats the change from
7-12VDC to lower than 2VDC.
YES
Note
Pulse signal(FG) generated from the Fan motor rotation is transmitted through CN75 #5(F), #6(R), #7(C)
Micom senses these signal.
If Micom senses no signal, Micom make Fan Motor stop for 10 sec and try to operate it again. Micom keeps
doing the same procedure 4 times until Micom receive the signal.
If it still fails, MICOM stop trying for 10 minutes.
This procedure prevents the motor from overload when foreign substances such as ice built up around the
motor restrict motor rotation.
For R-FAN
The voltage
between GND in Main PBA and CN75
#3 is 8-12 VDC
NO
Reading with Door closed.
-.OPEN 5V, CLOSE 0V
For R-RAN
The voltage between
GND and CN75 #3 repeats the change from
7-12VDC to lower than 2VDC.
YES
78
Start
NO
COMP is on?
YES
For F-Fan
YES
The voltage
between GND in Main PBA and CN75
#4 is 8-12 VDC
NO
NO
Freezer/Fridge/Home
Bar Door S/W is closed.
YES
Plug in again after 5
Upon the initial power on,
minutes from the power off. Comp and F/R/C-Fan operate
for 5 minutes regardless of
the conditions.
For F-FAN
NO
The voltage between
GND and CN75 #4 repeats the change from
7-12VDC to lower than 2VDC.
YES
Possible Causes
1. Defective FAN-MOTOR
2. Contact problem at the terminal
3. FG signal error
(Refer to Fan-Motor circuit in this manual)
Run Forced Operation
FAN operates normally.
Check after closing the
Door. When there is Door
alarming, repair the Door
S/W connector.
Replace MAIN PBA