Mitsubishi Electric MUZ-GF60VE-E1 Service Manual page 33

I Check of outdoor fan motor
Disconnect the connectors CN931
and CN932 from the inverter P.C.
board.
Check the connection between the
connector CN931 and CN932.
Is the resistance between each ter-
minal of outdoor fan motor normal?
(Refer to 11-4.)
No
(Fixed to either 5 or 0 VDC)
Replace the outdoor fan motor.
J Check of power supply
Disconnect the connector between
the compressor and the IGBT
module (IC700).
Turn ON the power supply and
press EMERGENCY OPERATION
switch.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Yes
Is there bus-bar voltage 325 - 370
VDC between JP715 (+) and JP30
(–) on the inverter P.C. board?
(Refer to 11-6.1.)
No
Check the electric parts in main circuit.
OBH635C
Yes
Disconnect CN932 from the inverter P.C. board, and turn ON the
power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
Does the voltage between each terminal become 5 and 0
No
VDC repeatedly?
Does the outdoor fan motor rotate smoothly?
No
Replace the inverter P.C. board.
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 VAC
between the indoor terminal
No
block S1 and S2?
Does LED on the inverter P.C.
board light up or fl ash? (Refer
Yes
to 11-6.1.)
Yes
If lights up, OK.
If fl ashes, refer to 11-3.
33
Yes
Yes
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
JP715
325 -370 VDC
JP30