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11-4. Freezer fan abnormality(BLDC-FAN repair)
Measure in door closing
-. F-DOOR OPEN : DC5V
-. F-DOOR CLOSE : 0V
After impression of initial power
compressor and fans run continuously.
(It runs without regard to temperature)
If the pulse signal of fan self occurring through CN73 3
is not detected to MICOM, fan protection function runs
that performs 3 seconds ON 7 seconds OFF in five
times. It occurs DC7~12V at the time of 3 seconds
ON, it becomes below DC 2V at 7 seconds OFF.
1) Refrigerator controls the refrigerator temperature by damper motor without fan motor.
2) Because the apparatus room fan motor is applied to the same BLDC fan with F-fan, Check it by
reference to circuit diagram with the above method.
Reference
Is the compressor off?
Start
Forced start
Is it DC 7V~DC 12V between
main PCB part GND and CN73 1pin?
Impress the power after five minutes from the power
off(Compressor O/L/protection)
Check and repair the fan motor self inferior, contact
inferior of cord connection part
N
Y
F-fan normal
Y
Repair the door S/W connection part
Y
Main PCB exchange/repair
N
Is it repeated DC 7V~DC 12V
and below 2V between main PCB part
GND and CN73 1 pin?
Y
1) When the freezer fan is abnormal, freezer and refrigerator weak cooling occurs.
This is a freezer fan system failure. Refer to the followings.
Condition for decision
Is it DC 0V between main
PCB part CN30 1~2(freezer) and
5~6(refrigerator) pin?
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