If Fan Does Not Operate(F, R, C - Fan) - Samsung RF267AE series Service Manual

TROUBLESHOOTING

4-2-2. If FAN does not operate(F, R, C - FAN)

- 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 vol t age between MAIN
PCB REG1, HEAT SINK and
CN76#5(Sky -bl u e) around DC7~12V?
Is the external temperature above
66.2 ℉(19℃ )?
Recheck after 7 minutes
(Time could be delayed
depending on the
Door
temperatures. If the
temperature is lower, It
Close
may not operate : about
Open
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
CN30#2 (Purple) around 0V?
Door & MICOM State
F
R MICOM(#82)
MICOM
Right and Left
(#83)
5V(High) 0V(Low)
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
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 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 about 7
minutes delay after power
OFF. (For preventing the
over load of compressor)
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.
☞ 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.
- Motor rpm could be changed by capability without previous.
1) F-FAN 2) R-FAN
68
Excute manualoperation.
If initial temperature of F Room
is under the 41℉ (5℃), waitng
7 minutes and then activate.
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
REG1 Heater Sink
3) C-FAN