Muz-Ge50Va Muz-Ge50Vah - Mitsubishi Electric MUZ-GE25VAH Service Manual

J Check of power supply
MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH

MUZ-GE50VA MUZ-GE50VAH

Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does The upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Yes
Is there voltage 280 - 370 VDC
between DB61 (+) and DB61 (–)
on the inverter P.C. board?
(Refer to 11-6.1.)
No
Check the electric parts in main circuit.
MUZ-GE60VA MUZ-GE71VA
Disconnect the connector between
compressor and intelligent power
module.
Turn ON 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.
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 VAC
between the indoor terminal
No
block S1 and S2?
Dose LED on the inverter P.C.
board light up or fl ash? (Refer
Yes
to 11-6.1.)
Yes
If light up, OK.
If fl ash, refer to 11-3.
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 VAC
between the indoor terminal
No
block S1 and S2?
Dose LED on the inverter P.C.
board light up or fl ash? (Refer
Yes
to 11-6.1.)
Yes
If light up, OK.
If fl ash, refer to 11-3.
325 -370 VDC
51
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
280 - 370 VDC
DB61
Inverter P.C. board
(Solder side)
MUZ-GE25/35/42/50
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
JP30 JP715
MUZ-GE60/71