Samsung RB31FEJNB Series Service Manual page 67

4. TROUBLESHOOTING
4-2-4) When the C-Fan does not operate (Applies to Models with C-Fan)
- This refrigerator uses the BLDC Fan Motor.
The BLDC Motor operates with DC 7~12V.
- The F-Fan motor generally runs together with the compressor.
☞ When checking with the Self Diagnosis
Upon the initial power on, the compressor
and the C-Fan operate.
And, this function starts operating when
the compressor is about to run right after
an instant power outage.
◆Note : C-FAN Operations by Ambient Temperature
1. 29℃ or higher : Turns on after a 10 minute pause
when the Compressor starts operating.
2. 18℃~28℃ : Turns on immediately when the
Compressor starts operating.
3. 18℃ or higher : Turns off after a minute when
the Compressor stops operating.
4. 17℃ or lower : Turns on when the Compressor
starts operating. (But, the C-FAN turns on when
the C-FAN is detected as bein g ristricted for an
hour continually).
5. 17℃ or lower : Turns off (for up to 150 minutes)
when the Compressor stops operating.
Start
The Compressor is Off.
It reads DC7~12
between MAIN PCB
GND and CN76 #8.
Apply power in 7 minutes after turning
the motor off.
(To prevent the compressor from
being overloaded)
Does it read DC7~12V
(between MAIN PCB GND and CN76 #8)
and lower than DC 2V
(between MAIN PCB GND and
CN76 #7)?
◆ Possible Causes
① Defective FAN-MOTOR
② Contact problem at the terminal
(MAIN PCB CONNECTOR-TERMINAL (CN76. ⑦,⑧,⑩),
Contact problem at C-Fan Motor Connector, Defective
Motor Wire)
③ Check the motor rotating pulse input upon Fan Motor
operation. (Refer to Fan-Motor Circuit in this manual)
Yes
No
Yes
No
Yes
No
Yes
67
Run Forced Operation
FAN operates.
Replace MAIN PCB
No