Samsung AM27B1C07 Service Manual page 10

3-2-2 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?
Test rod location
+
SS71-
Is the supply voltage of the fan
motor sufficient?
Test rod location
PCB CN72 Condition
Fan operate
pin #3 and #5
YES
YES
Normal
Voltage
-
SS71- 12V
YES
Normal
voltage
about AC 180V
YES
NO
Check as in the procedure "NO power parts"
NO
NO
PCB is
out of order.
MF-C is out of order
Fan motor
is out of order.
Refer to page 8.
Microcomputer is out of order.
PCB should be
replaced.
Replace MFC
Fan motor
should be replaced.
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