Samsung MC18AC2-09, Service Manual

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5-3 Samsung Electronics
Troubleshooting
5-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is the indoor unit fan motor properly connected with the connector (CN72)?
(2) Is the AC voltage correct?
(3) Is HALL IC in indoor fan motor properly connected with the connector (CN42)?
(4) Is the running capacitor (CR71) properly connected with PCB board?
2) Troubleshooting procedure
After unplugging out the power cord should
be reconnected within five seconds.
Does the STD lamp(Green) blink?
Does the Solid State Relay(SS71) work
properly?
Is the supply voltage of the fan
motor sufficient?
Test rod location
PCB CN72 Condition
Fan operate about AC 180V
Normal
voltage
pin #3 and #5
YES
YES
YES
NO
NO
NO
Check as in the procedure “NO power parts”
Refer to page 5-2.
Microcomputer is out of order.
PCB is
out of order.
PCB should be replaced.
Replace MFC
Fan motor
should be replaced.
Fan motor
is out of order.
MF-C is out of order
YES
-
Test rod location
+
SS71- SS71- 12V
Normal
Voltage
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-1