4-2-5) When Fan Does Not Operate - Samsung RSA1Z Series Service Manual

TROUBLE SHOOTING

4-2-5) When Fan does not operate

- A BLDC Fan Motor is applied to this refrigerator.The BLDC motor runs on DC8~12V.
The F-Fan motor runs together with the compressor. But, due to conditions, the F-Fan Motor does not operate.
Also, when the ambient temperature is high and the Door is open and closed, the F-Fan operate after one minute.
So, it needs addition checking before considering it as a defect.
Note
Pulse signals being generated when the motor is rotating are to be input to CN74 #7(F), and #5(C).
These will be input to MICOM and when there are no signals with the motor rotating, the fan will be
turned off and then be turned on in 10 seconds.
If there are still no signals, it keeps trying the above 4 times. And, if it still fails, it runs the motor in 10
minutes. It is implemented to prevent the motor from being overloaded due to restrictions by foreign
substances such as ice built up around the motor.
For C-FAN
It reads DC8~12V
between MAIN PCB GND
and CN74 #2.
NO
Reading with Door closed.
-.OPEN 5V, CLOSE 0V
For C-FAN
It repeats DC8~12V,
and DC 2V or lower between MAIN PCB GND
and CN74 #2.
YES
Start
COMP is Off?
YES
For F-Fan
It reads DC8~12V
between MAIN PCB GND
and CN74 #4.
NO
Fridge/Home
Bar Door S/W is closed.
YES
Apply power around 7
minutes after the power off.
(To prevent the compressor
from being overloaded)
For F-FAN
It repeats DC8~12V,
and DC 2V or lower between MAIN PCB GND
and CN74 #4.
YES
Possible Causes
1. Defective FAN-MOTOR
2. Contact problem at the terminal
3. Check the motor rotating pulse input upon Fan Motor operation.
(Refer to Fan-Motor Circuit in this manual)
63
NO
Run Forced Operation
YES
FAN operates normally.
NO
Check after closing the
Door. When there is Door
alarming, repair the Door
S/W connector.
Upon the initial power on,
Comp and F/C-Fan operate
for 3 minutes regardless of
the conditions.
NO
Replace MAIN PCB