Mitsubishi Electric MUZ-LN25VG-E1 Service Manual page 64

J Check of power supply
Disconnect the connector between the
compressor and the power module
(IC700). Turn ON power supply and
press the emergency operation switch.
Does POWER lamp on the indoor
unit light up?
Yes
Is there bus-bar voltage 260 - 370 V
DC between DB61 (+) and DB61 (–)
(MUZ-LN25/35/50VG, MUZ-
LN25/35/50VG2)/325 - 370 V DC
between IC700 (P) and (N)
(MUZ-LN60VG, MUZ-LN60VG2) on
the inverter P.C. board? (Refer to 12-
6.1.)
No
Check the electric parts in main circuit.
OBH767G
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 V AC
between the indoor terminal
No
block S1 and S2?
Does LED on the inverter P.C.
board light up or blink?
Yes
(Refer to 12-6.1.)
Yes
If lights up, OK.
If blinks, refer to 12-3.
325 -370 V DC
325 -370 V DC
64
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
260 - 370 V DC
DB61
Inverter P.C. board
(Solder side)
MUZ-LN25/35/50/60VG
MUZ-LN25/35/50VG2
IC700
N
P
MUZ-LN60VG
IC932
P
Inverter P.C board
N
(Solder side)
IC700
MUZ-LN60VG2