53
Diagnostics
11-7) If fan doesn’t work:
The refrigerator has been applied with the BLDC fan motor. For RS2533, R room Fan is AC motor used. The BLDC
motor is driven by DC 8-12V.
Under the normal condition of COMP ON, it is operated together with F-FAN motor. With operation of the CoolSelect
Zone
TM
function, the F-Fan motor may do not work. If the door is opened and closed once at a high ambient
temperature, the BLDC motor would be operated after a 1-minute or longer delay. Therefore, you’ re advised not to
take it for an error.
When the refrigerator is open, the freezer fan motor will also stop working simultaneously with the fan motor. (for the
purpose of performance improvement).
Reference
COMP OFF?
Start
Execute Forced
operation. (See page
34 in the manual)
Is the voltage DC 9-11V between
GND of the main-PCB section and
CN72 pin No. 6?
Fan works normally.
Is the voltage DC 0V between
CN30 No. 1 and No. 2
in the main-PCB?
Troubleshoot the
connections of door S/W.
In the first power application, the
freezer / fridge / compressor fans
work for 5 minutes regardless of the
condition.
Apply power around 5 minutes
after the power OFF. (Prevent
overload of compressor.)
Expected causes :
1. Check if the fan motor has failure itself.
2. Check if the wire connections have a trouble of contact.
3. Check the input of the fan motor rotation pulse in the operation motor
fan. (See the details of Fan Motor Drive Circuit section.)
YES
YES
NO
NO
NO
YES
Is the voltage DC10V between
GND of the main-PCB and pin No. 4
of CN72 ?
Is the voltage DC 0V between
CN30 No. 5 and No. 6 in the main-PCB
section?
NO
Is the voltage between GND
of the main-PCB and pin No. 4 of CN72
around DC 8-10V?
NO
YES
Does DC 9-11V alternate
with below DC 2V between GND of the main-PCB section
and CN72 pin No. 6?
Exchange or troubleshoot the
main PCB.
Measure with the door closed.
- door open: DC 5V
- door close : 0V
NO
YES
CN72 No. 3(F), 2(R),1(C) will be generated pulse signals when the motor rotates. These signals will be
inputted into MICOM. Unless signals are not inputted in the restart of motor, it will be ON 10 seconds after
the fan OFF. But if signals are not still entered, the above operation will restart four times more. Without
signals entered continuously, the motor will get restarted after 10 minutes. This function is effective where
the normal operation of motor would be restrained due to foreign matters such as ice.
Reference
Does DC 10V alternate
with below DC 2V between GND of the main-PCB section and
CN72 pin No. 5?
YES
Does DC 8-10V alternate
with below DC 2V between GND of the main-PCB
section and CN72 pin No. 4?
YES
For C-FAN
For C-FAN
For R-RAN
For F-FAN
For R-FAN
For F-Fan
