Mitsubishi Electric MUZ-EF25VG Service Manual page 43

J Check of power supply
Disconnect the connector between the
compressor and the power module
(IC700). Turn ON power supply and
press EMERGENCY OPERATION
switch.
Does the upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Is there bus-bar voltage 260 - 370 V
DC between DB61 (+) and DB61 (–)
on the inverter P.C. board? (Refer to
12-6.1.)
Check the electric parts in main circuit.
OBH832
No
Yes
Yes
No
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 V AC
between the indoor terminal
block S1 and S2?
Does LED on the inverter P.C.
board light up or blink?
(Refer to 12-6.1.)
Yes
If lights up, OK.
If blinks, refer to 12-3.
43
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)