Toshiba MM-A0280HT Service Manual page 59

Indoor fan motor alarm
Does indoor fan operate
for a short period after
resetting and resuming?
Is there a connection
error of CN18 connector?
Is approx. DC12V to
13V output to CN18
connector 1-3 pins?
Is revolution pulse
input from hole IC to
CN18 connector 2-3 pins
during fan operation?
(Measurement by tester:
Approx. DC2 to 2.5V)
14
Is there an irregularity
of power source?
Indoor P .C. board check
Defective ¡ Replacement
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[11]
No
Yes
Yes
No
No
Yes
No
Yes
Check code
[12]
Other indoor alarm
Yes
No
1. Fan motor circuit connection error
2. Capacitor error
3. Fan motor error
4. Defective indoor P .C. board
Is there a connection
error of CN07 connector?
No
Is capacitor normal?
Yes
Confirm there is no mechanical
lock on the fan motor?
No
1. Irregularity of power source
2. Noise of peripheral equipment
3. Defective indoor P .C. board
60
Operation cause
Modify connection and wiring.
Yes
No
Replace capacitor.
Yes
Replace fan motor.
Replace MCC-1355-01
P .C. board
Operation cause
Check power source voltage,
modify lines, remove noise, etc.