Mitsubishi Electric Mr.Slim MSY-D30NA, Service Manual

Page: 109 / 214

31
CN211
R111
Indoor electronic
control P.C.Board Indoor terminal
P.C. board
Fuse
(F11)
Varistor
(NR11)
Yes
No
1. The fan motor connector's lead wire is red, whereas is black.
2. Connect "+" of the tester to fan motor connector's lead
wire, and "-" to lead wire, otherwise the resistance cannot be
measured properly.
3. Please replace the fuse after removing the indoor terminal
P.C. board from the electrical box.
Yes
No
Does the unit operate with the remote controller?
Does OPERATION INDICATOR lamp light up by
pressing EMERGENCY OPERATION switch?
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and
vane motor connector CN151 from the indoor electronic
control P.C. board and turn ON the power supply.
Measure the resistance of the horizontal vane
motor coil.
Refer to 9-5.
Measure the resistance between CN211
and of the indoor fan motor connector.
Short circuit:
Replace the indoor fan motor.
Short circuit:
Replace the horizontal vane motor and the indoor
electronic control P.C. board.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control P.C.
board visually.
Replace the varistor (NR11) and fuse (F11). 3
Are the varistor (NR11) burnt
and the fuse (F11) blown?
Be sure to check both the fuse
and the varistor in any case.
No
Yes
No
Is the fuse (F11) blown only?
Yes
No
Is the resistance 1M Ω
or more?
Measure the resistance between
CN211 (+) and (-) of the indoor
fan motor connector. 1, 2
Replace the fuse (F11). 3
Replace the fuse (F11) and the indoor fan motor. 3
Is the resistance
approximately 4 Ω ?
Measure the resistance of cement
resistor R111 on the indoor electronic
control P.C. board.
Replace the indoor electronic control P.C. board.
Replace the indoor electronic control P.C. board
and the indoor fan motor.
Yes
MSZ-GE24NA
MSY-GE24NA
OBH548D