Mitsubishi Electric MUZ-FH25VEHZ Service Manual page 30

J Check of power supply
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does POWER lamp on the indoor
unit light up?
Yes
Is there voltage 260 - 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.
OBH625
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?
Yes
(Refer to 11-6.1.)
Yes
If light up, OK.
If fl ash, refer to 11-3.
30
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
260 - 370 VDC
DB61
Inverter P.C. board
(Solder side)