Samsung RS2666 If fan doesn’t work Reference, Connections of door S/W, Door open DC, Door close

Diagnostics

11-7) If fan doesn’t work:

Reference

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 ZoneTM 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).

Start

YES

COMP OFF?

For C-FAN

Is the voltage between GND

of the main-PCB and pin No. 4 of CN72

around DC 8-10V?

NO

For R-FAN

Is the voltage DC10V between

GND of the main-PCB and pin No. 4

of CN72 ?

NO

Is the voltage DC 0V between

CN30 No. 5 and No. 6 in the main-PCB

section?

YES

			Execute Forced
For F-Fan	NO
			operation. (See page
Is the voltage DC 9-11V between		YES	34 in the manual)
GND of the main-PCB section and
CN72 pin No. 6?
	NO
			Fan works normally.
Is the voltage DC 0V between		NO
CN30 No. 1 and No. 2
in the main-PCB?
	YES		Troubleshoot the

connections of door S/W.

For C-FAN

DoesDC8-10Valternate

withbelowDC2VbetweenGNDofthemain-PCB

sectionandCN72pinNo.4?

YES

Reference

			Apply power around 5 minutes
	Measure with the door closed.			In the first power application, the
	- door open: DC 5V		after the power OFF. (Prevent	freezer / fridge / compressor fans
	- door close : 0V		overload of compressor.)	work for 5 minutes regardless of the
				condition.
For R-RAN		For F-FAN

DoesDC10Valternate	Does DC 9-11V alternate	NO
withbelowDC2VbetweenGNDofthemain-PCBsectionand	with below DC 2V between GND of the main-PCB section
CN72pinNo.5?	and CN72 pin No. 6?
YES	YES		Exchange or troubleshoot the
			main PCB.

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.

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.)

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