Refrigerator Service Guide

69
TROUBLESHOOTING
4-2-3. If ICE Room Fan does not operate
- This refrigerator has BLDC FAN motor. BLDC motor is driven by DC7~12V.
- When COMP ON, normally operates with F-FAN motor.
- If there is any trouble, you should select the self-diagnostic function to check the trouble before power off.
Start
Execute manual operation
No
Yes
Yes
No
Yes
Yes
No
No
Is COMPRESSOR ON ?
Is the Ice Room
temperature suitable for
the Fan working?
◆ Predicted Cause
① FAN-MOTOR troubles itself
② Bad wiring connections.
③ Wrong Input of the fan motor rotation pulse
Reference
CN76 #6 will generate the pulse signal when motor rotates.
These signals will be input into MICOM.
Unless signals are not input during motor operating, will be ON
10seconds after fan OFF. But if signals are not still taken, the
above operation will be retried four times more. If signals are not
taken continuously, the motor will be restarted after 10 minutes.
This function is against the case that motor movement would be
restrained by foreign matters like ice.
- When pressing the ICE TEST S/W for a certain period of time
(over 1.5sec), the function is accomplished. After beginning of
TEST mode, Ice maker heater turns on for initial 2 minutes, if the
ice making temperature is below 0℃.
- If it exceeds 0℃, Ice maker heater turns on for initial 30 seconds.
- After Ice maker heater turns on for 30 seconds, it turns off and
then Ice maker motor turns on.
- As the Ice maker motor turns on, TEST MODE COUNT
operates. (6 minutes count)
Condition
- Ambient temperature : 32℃/75%
- Notch : 2℉/38℉(-19.0℃/3.3℃)
Initial full of ice bucket capacity : 794 g, 58ea
Is the voltage between
MAIN PCB REG1 Heater Sink and
CN76-”2” (Black) around
DC7~12V?
Does DC7~12V alternate
with below DC2V between MAIN PCB REG1
Heater Sink and CN76-”2”(Black)?
FAN works normally
Operation
temperature/ready
Replace MAIN PCB
FAN pulse voltage
CN76-”6”(Pink)
Typical PCB Ground
REG1 Heater Sink
Ice Room control temperature
Ice ON
8.6℉(-13℃)
Ice OFF
26.6℉(-3℃)
The voltage is variable due to pulse
signal but measured about 2~3V with the
Multi-Meter.
☞ Display for checking the self-diagnostic function
Ice Room FAN ERROR
☞ Checking method of Ice Room FAN Motor Voltage with the voltage between typical
PCB Ground REG1 Heater Sink and Ice Room FAN ; CN76-”2”(Black) shall be less
than DC 6~12V.
- Additional check if resistance values are different after measurement.
Typical PCB Ground
REG1 Heater Sink
1) Ice Room - FAN
AW-SEM Transform(RF267,2#3957D8 2009.8.20 4:54 PM 페 이 지 6 9 i n