If Ice Room Fan Does Not Operate - Samsung RF267AARS Service Manual

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.
Ice Room control temperature
Ice ON
Ice OFF
Reference
CN76 #2 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.
FAN pulse voltage Typical PCB Ground
CN76-"2"(Brown) CN1-"3"(Black)
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
2¢ (-19¡ ) is recommended 38¢ (3¡ ) is recommended
8.6 (-13 )
26.6 (-3 )
Checking method of Ice Room FAN Motor Voltage with the voltage between typical
PCB Ground CN1-"3"(Black) and Ice Room FAN ; CN76-"1"(Black) shall be less
than DC 6~12V.
- Additional check if resistance values are different after measurement.
1) Ice Room - FAN
Start
Is COMPRESSOR ON ?
Yes
Is the voltage between
MAIN PCB CN1-"3"
(Black) and CN76-"1"
(Black) around DC7~12V?
No
Is the Ice Room
temperature suitable for
the Fan working?
Yes
Does DC7~12V alternate
with below DC2V between MAIN PCB CN1-
"3"(Black) and CN75-"2"(Yellow)?
Yes
Predicted Cause
FAN-MOTOR troubles itself
Bad wiring connections.
Wrong Input of the fan motor rotation pulse
71
No
Execute manual operation
Yes
FAN works normally
No
Operation
temperature/ready
No
Replace MAIN PCB
Typical PCB Ground
CN1-"3"(Black)