Samsung RF195AC Service Manual page 48

TROUBLESHOOTING
4-2-2. If FAN does not operate (F, R, C - FAN)
-. The refrigerator of this model has BLDC FAN moror. 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 external temperature above
66.2 ℉(19℃ )?
Is the voltage between Main
PCB REG1 Heater Sink and CN76 -
#4(Orange) around DC7~12V?
Is the external temperature
above 66.2℉(19℃)?
Recheck after 5 minutes
(Time could be delayed
depending on the
Door
temperature).
If the temperature is
Close
lower, it may not operate.
; about59℉(below15℃)
Open
Does DC7~12V alternate with below
DC 2V between Main PCB REG1 Heater
Sink and CN76-#4 (Orange)?
F FAN pulse voltage Common PCB Ground
CN76- #2(Pink) REG1 Heater Sink
The voltage is measured around 2~3V with
multi-meter, though the voltage is changed
because of pulse signal.
☞ Display for checking the self-diagnostic function
R FAN ERROR
F FAN ERROR
C FAN ERROR
Is the voltage between Main
PCB REG1 Heater Sink and CN76
-#6(Brown) around DC7~12V?
Is the voltage between Main
PCB REG1 Heater Sink and CN30-
#1 (Black) around 0V?
F
MICOM R MICOM (#52)
(#60)
0V(High) 0V(Low)
5V(Low) 5V(High)
Does DC7~12V alternate with below
DC2V between Main PCB REG1 Heater
Sink and CN76-#5(Red)?
Reference
The pulse signal generated when motor rotates will be inputted into CN76-
#2(F),#3(R),#1(C). These signals will be inputted into MICOM. If signals
are not inputted during motor operating, the fan is turned OFF and ON
again after 10 seconds. But if signals are not still entered, above operation
is repeated for 4 times more. If signals are not entered continuously, the
motor is restarted after 10 seconds. This function is effective when the
normal operation of motor is locked by foreign matters such as ice.
☞ Checking method of R,F,C FAN Motor The voltage of PCB
common Ground REG1 Heater Sink and
F FAN ; CN76-#5(Red) shall be less than DC 7~12V.
R FAN ; CN76-#6(Brown) shall be less than DC 7~12V.
C FAN ; CN76-"4"(Orange) shall be less than DC 7~12V.
-. Recheck if resistance values are different after measuring.
1) F-FAN
48
Is COMPRESSOR
ON?
Is the voltage between Main
PCB REG1 Heater Sink and CN76
-#5(Red) around DC7~12V?
Is the voltage between
Main PCB REG1 Heater Sink and
CN30-#2 (Brown) around 0V?
When initial power is applied to
Power ON with 5 minutes
appliance, the compressor and fans
delay after power OFF.
of fridge/freezer/compressor operate.
(For preventing the over
If freezer temperature is sensed 41℉
load of compressor)
by momentary power failure, fans will
operate after 5minutes.
Does DC7~12V alternate with below
DC2V between Main PCB REG1 Heater
Sink and CN76-#5(Red)?
2) R-FAN
Execute manual
operation
FAN works normally
Repair the connection
of Door S/W
Replace or repair Main PCB
◆ ◆ Expected causes
① FAN-MOTOR has failure itself.
② Check the bad contact of wiring
connection.
③ Check the input of the motor
rotation pulse when fan motor
operates.
Common PCB
Ground of REG1 Heater Sink
3) C-FAN