When The Fan Does Now Operate (F, R, M, C - Fan) - Samsung RF32FM SERIES Service Manual

TROUBLESHOOTING

4-2-8. When the Fan does now operate (F, R, M, C - FAN)

- This refrigerator uses the BLDC Fan Motor. The BLDC Motor operates with DC 7~12V.
- Under Comp On conditions, the R-Fan operates generally. But, when the ambient temperature is high or when you open and close
the Door once, it operates after one-minute delay. So, don't get misled by it. It is normal.
- When there is defect, turn on the Self-Diagnosis function and confirm the defect before turning off the unit.
C-FAN
Voltage between MAIN PCB
GND and CN75 #2 is
measured about DC8~12V?
No
M-FAN
Voltage between MAIN PCB
GND and CN75 #6 is
measured about DC8~12V?
No
C-FAN
Voltage between MAIN PCB
GND and CN75 #2 is
measured about DC2V?
Yes
M-FAN
Voltage between MAIN PCB
GND and CN75 #6 is
measured about DC2V?
Yes
Note
Pulse signal is generated at CN74 #7 (F), #8 (R), #9 (C) and #11 (CZ
Freezer) when the Motor spins. This signal enters to MICOM and if
there is no signal entering when the Motor spins, the Fan goes off and
works again in 10 seconds.
If there is still no signal entering, it repeats the above operation 4 more
times. If it keeps not sending the signal, the Motor operates in 10
minutes. This is a function to overcome the case that there is a
restriction in the Motor due to foreign substances around the Motor.
R-FAN
Voltage between MAIN PCB
GND and CN75 #3 is
measured about DC8~12V?
No
Read with the Door closed :
Open – 5V, Closed – 0V
Apply power in 7 minutes after
turning off the power. (To prevent
R-FAN
Voltage between MAIN PCB
GND and CN75 #3 is
measured about DC2V?
Yes
Start
COMP is running?
F-FAN
Yes
Voltage between MAIN PCB
GND and CN75 #4 is
measured about DC8~12V?
No
Are the Freezer, the Fridge and
the Door Switches closed?
Yes
No
Compressor overload)
F-FAN
Voltage between MAIN PCB
GND and CN75 #4 is
measured about DC2V?
Yes
◆ Expected Causes
① Defective Fan-Motor
② Contact error at wire connection
③ When the Fan Motor operates, check the input of
the Motor Spinning Pulse.
How to Check the F-Fan Voltage
- Measure voltage between MAIN PBA GND and CN75 #4.
- When it is between 8~12V, it is normal. (Measure with
the same method for R/M/C-Fans.)
67
No
Turn on Forced Operation.
Yes
FAN works normal.
No
Check after closing the Door
When there is door alarm sound,
repair the Door Switch Connector.
Upon the initial power on, the Compressor and
the Freezer / Fridge / Comp Fans will run for
3 minutes regardless of operating conditions.
No
Replace the Main PCB