Samsung AS07A5MA Service Manual page 17

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Troubleshooting (cont'd)
2. When the Indoor Unit Fan Does Not Operate - Initial Diagnosis
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 the 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
Test rod location
+
SS71-
Is the supply voltage of the fan
Test rod location
PCB CN72
pin #3 and #5
16
YES
YES
properly?
Normal
Voltage
-
SS71- 12V
YES
motor sufficient?
Normal
voltage
Condition
about AC
Fan operate
180V
YES
NO
Check as the procedure "No power"
Refer to page 14
NO
Micom is abnormal
NO
PCB is
abnormal
MFC is abnormal
Fan motor
is abnormal.
Replace PCB
Replace MFC
Replace Fan motor