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PRECAUTIONS(SAFETY WARNINGS)
4-5-6. When Fan does not operate
COMP is on?
Start
Run Forced Operation.
The voltage
between GND in Main PBA and CN74
#4 is 7-12 VDC
FAN operates normally.
Freezer Door S/W is closed.
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
5 minutes regardless of the
conditions.
◆
Possible Causes
1. Defective FAN-MOTOR
2. Contact problem at the terminal
3. FG signal error (Refer to Fan-Motor circuit in this manual)
NO
YES
YES
NO
NO
YES
The voltage between
GND and CN74 #4 repeats the change from
7-12VDC to lower than 2VDC.
Replace MAIN PBA.
Reading with Door closed.
-.OPEN 5V, CLOSE 0V
Reading with Door
closed.
-.OPEN 5V, CLOSE 0V
Plug in again after
5 minutes from
the power off.
Upon the initial power on,
Compand F/C Fan operate
for 5 minutes regardless
of the conditions.
NO
YES
Pulse signal(FG) generated from the Fan motor rotation is transmitted through CN74 #9(F), #10(R), #11(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.
Note
The voltage
between GND in Main PBA and
CN74 #2 is 7-12Vdc
NO
The voltage between
GND and CN74 #2 repeats the change from
7-12VDC to lower than 2VDC.
YES
For C-FAN
For C-FAN
The voltage
between GND in Main PBA and
CN74 #3 is 7-12Vdc
Fridge Door S/W is
closed.
NO
The voltage between
GND and CN74 #3 repeats the change from
7-12VDC to lower than 2VDC.
YES
For R-Fan
For R-Fan
For F-FAN
For F-Fan
- This model has BLDC FAN motor. BLDC motor is driven by DC7~12V
- F-Fan motor usually runs together with the Compressor. 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.
☞
Checking method of C-Fan motor voltage
- Read the voltage between MAIN PBA GND and CN74 #2
- If it has 7~12 voltage, It's normal.
(Same method is applied to other Fan Motor)
Plug in again after
5 minutes from
the power off.
