If Fan Does Not Operate - Samsung RF4287HARS Service Manual

AW3 SM-EN 2011.3.31 2:56 PM 페이지80 in
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 REG1, HEAT SINK and CN
76#5(Sky -blue) around DC7~12V?
Is the external temperature
above 66.2 ℉(19℃ )?
Recheck after 5 minutes
(Time could be delayed
depending on the
temperatures. If the
temperature is lower, It
may not operate : about
59℉ (below 15℃)
Does DC7~12V alternate with below
DC 2V between MAIN PCB REG1 Heater
Sink and CN76#5(Sky-blue)
F FAN pulse voltage Typical PCB Ground
CN76#7(Brown) REG1 Heater Sink
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
F FAN ERROR
C FAN ERROR
Is the voltage between MAIN
PCB REG1,Heater Sink and CN76#4
(Orange) around DC7~12V?
Is the voltage between MAIN
PCB REG1,Heater Sink and CN
30#2 (Purple) around 0V?
Door & MICOM State
F
R MICOM(#82)
Door MICOM
(#83) Right and Left
Close 5V(High) 0V(Low)
Open 0V(Low) 5V(High)
Does DC7~12V alternate with below
DC 2V between MAIN PCB REG1 Heater
Sink and CN76#4(Orange)
Reference
CN76-7(F),8(R),9(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 Minutes. This function is effective when the normal operation of motor
would be restrained by foreign matters such as ice.
☞ Checking method of R,F,C FAN Motor voltage
The voltage between PCB typical Ground REG1 Heater Sink and
F FAN ; CN76#3(Yellow) shall be less than DC 7~12V.
R FAN ; CN76#4(Orange) shall be less than DC 7~12V.
C FAN ; CN76#5(Sky-blue) shall be less than DC 7~12V.
- Recheck if resistance values are different after measuring.
1) F-FAN
80
Start
Is COMPRESSOR ON ?
Is the voltage between MAIN
PCB REG1 Heater Sink and CN76#3
(Yellow) around DC7~12V?
Is the voltage between MAIN
PCB REG1 Heater Sink and CN30#1
(Black) around 4.5~5V?
Power ON with 5 minutes
In initial power to appliance, the compressor
delay after power OFF.
and fans of fresh food/ freezer, compressor
For preventing the over
fan operate. If freezer temperature is sensed
load of compressor)
of 41℉ by momentary power failure, fans
will operate after 5 minutes.
Does DC7~12V alternate with
below DC 2V between MAIN PCB REG1
Heater Sink and CN76 #3(Yellow)
◆ Expected causes
① Check that if FAN-MOTOR has failure
itself.
② Check that if wiring connection has bad
contact.
③ Check the input of the fan motor rotation
pulse when motor fan operates.
2) R-FAN
Execute manual
operation
FAN work normally
Repair the connection
of Door switch
Replace MAIN PCB
Typical PCB Ground
REG1 Heater Sink
3) C-FAN