Mitsubishi Electric MUZ-GE25VA-a1 Service Manual page 76

J Check of power supply
MUZ-GE25VA MUZ-GE25VAD MUZ-GE33VA MUZ-GE35VA
MUZ-GE42VA MUZ-GE42VAD MUZ-GE50VA MUZ-GE50VA2 MUZ-GE50VAD
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 260 - 300
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-GE60VAD MUZ-GE71VA
MUZ-GE80VA MUZ-GE80VA2 MUZ-GE80VAD
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.
OBH532E
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 light up, OK.
If fl ash, refer to 11-3.
MUZ-GE71VAD
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 light up, OK.
If fl ash, refer to 11-3.
325 -370 VDC
76
MUZ-GE35VA2 MUZ-GE35VAD
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No P.C. board.
DB61
Inverter P.C. board
(Solder side)
MUZ-GE25/33/35/42/50
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
JP30 JP715
MUZ-GE60/71/80
260 - 300 VDC