6-2) If Fan Does Not Operate - Samsung RF18A Series Service Manual

CHECK THE INSTALLATION STATUS

6-2) 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.
For C-FAN
Is the voltage between
MAIN PCB Ground CN51 "23"
(PRP) and CN51 "25" (GRY)
around DC7~12V?
No
Is the external temperature
above 66.2 ℉(19℃ )?
No
Recheck after 7 minutes.
(Time could be delayed
depending on the temperatures.
If the temperature is lower, It
may not operate : about 59℉
(below 15℃)
For C-FAN
Does DC7~12V alternate
with below DC 2V between
MAIN PCB Ground CN51 "21"
(BLU) and CN 51 "25" (GRY)?
Yes
This document cannot be used without Samsung's authorization.
For R-FAN
Is the voltage between
MAIN PCB Ground CN51 "18"
(BRN) and CN51 "20" (GRY)
around DC7~12V?
No
Is the voltage between
MAIN PCB Ground CN51 "10"
(BLK) and CN51 "13" (GRY)
around DC4.5~5V?
Yes
Door & MICOM State
R MICOM(#5)
FZ MICOM
Door
(#1)
Right and Left
Close 0V (Low) 0V (Low)
Open 5V (High) 5V (High)
For R-FAN
Does DC7~12V alternate
with below DC 2V between
MAIN PCB Ground CN51 "16"
(YEL) and CN51 "20" (GRY)?
Yes
◆ 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 pulsewhen motor fan operates.
Start
Is COMPRESSOR ON ?
Yes
For F-FAN
Is the voltage between
MAIN PCB Ground CN51 "17"
(S/BLU) and CN51 "19" (GRY)
around DC7~12V?
No
Is the voltage between
MAIN PCB Ground CN51 "1"
(ORG) and CN51 "3" (WHT)
around DC4.5~5V?
Yes
Power ON with 7 minutes
delay after power OFF.
For preventing the over
load of compressor.)
For F-FAN
Does DC7~12V alternate
with below DC 2V between
MAIN PCB Ground CN51 "15"
(PNK) and CN51 "19" (GRY)?
Yes
89
No
Execute manual operation.
Yes
FAN work normally.
No
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 7 minutes.
No
Replace MAIN PCB Ground.