If Fan Does Not Operate - Samsung RF267AARS Service Manual

TROUBLESHOOTING

4-2-2. If FAN does not operate

- The refrigerator of this model has BLDC FAN motor. BLDC motor is driven by DC 7~12V.
- On the normal condition of COMP ON, it operates together with F-FAN motor.
If door is opened and closed once at a high ambient temperature, it will be operated after 1 minute
delay.
Therefore, you are advised not to taken it for an error.
-. If there is a trouble, you should select the self-diagnostic function to check the trouble before power off.
Is the voltage between MAIN
PCB CN1#3 (Black) and CN75#4(Sky
-blue) around DC7~12V?
Door
Close
Open
Does DC7~12V alternate with below
DC 2V between MAIN PCB CN1#3(Black)
and CN75#4(Sky-blue)
F FAN pulse voltage typical PCB Ground
CN75#5(Black) CN10#3(Black)
The voltage measured around 2~3V
with multi-meter though the voltage is
very weak because of pulse signal
Display for checking the self-diagnostic function
R FAN ERROR
2¢ (-19¡ ) is recommended 38¢ (3¡ ) is recommended
F FAN ERROR
2¢ (-19¡ ) is recommended 38¢ (3¡ ) is recommended
C FAN ERROR
2¢ (-19¡ ) is recommended 38¢ (3¡ ) is recommended
Is the voltage between MAIN
PCB CN1#3 (Black) and CN75#3
(Orange) around DC7~12V?
Is the voltage between MAIN
PCB CN1#3 (Black) and CN30#2
(Purple) around 0V?
Door & MICOM State
F
R MICOM(#3)
MICOM
(#50) Right and Left
5V(High) 0V(Low)
0V(Low) 5V(High)
Does DC7~12V alternate with below
DC 2V between MAIN PCB CN1#3(Black)
and CN75#3(Orange)
Reference
CN75-5(F),6(R),7(C)will generate the pulse signal when motor rotates.
These signals will be inputted into MICOM.
Unless signals are not inputted during motor operating, will be ON 10
seconds after fan Off. But if signals are not still entered, the above operation
will restart four times more.
If signals are not entered continuously, the motor will be restarted after 10
seconds.
This function is effective when the normal operation of motor would be
restrained by foreign matters such as ice.
Start
Is COMPRESSOR ON ?
Is the voltage between MAIN
PCB CN1#3 (Black) and CN75#2
(Yellow) around DC7~12V?
Is the voltage between MAIN
PCB CN1#3 (Black) and CN30#1
(Black) around 5V?
Power ON with 5 minutes
delay after power OFF.
For preventing the over
load of compressor)
Does DC7~12V alternate with
below DC 2V between MAIN PCB
CN1#3(Black) and CN75-#2(Yellow)
Expected causes
Check that if FAN-MOTOR has failure
itself.
Check that if wiring connection has bad
contact.
Check the input of the fan motor rotation
pulse when motor fan operates.
Checking method of R,F,C FAN Motor voltage
The voltage between PCB typical Ground CN1-"3"(Black) and
R FAN ; CN75#2(Yellow) shall be less than DC 7~12V.
F FAN ; CN75#3(Orange) shall be less than DC 7~12V.
C FAN ; CN75#4(Sky-blue) shall be less than DC 7~12V.
- Recheck if resistance values are different after measuring.
1) R-FAN 2) F-FAN
70
Execute manual
operation
FAN work normally
Repair the connection
of Door switch
In initial power to appliance, the compressor
and fans of fresh food/ freezer, compressor
fan operate. If freezer temperature is
sensed of 41 by momentary power
failure, fans will operate after 5 minutes.
Replace MAIN PCB
typical PCB Ground
CN1#3(Black)
3) C-FAN