Check Of Power Supply - Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1 Service Manual

J Check of power supply
MUZ-GC25/35NA MUZ-GC50NA-
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the upper or left 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 9-6.1.)
No
Check the electric parts in main circuit.
MUZ-GC50NA- MUZ-GC60/71NA
C1
Check the connecting of parts of main power
supply circuit.
Turn ON power supply.
Is there voltage of 220 - 230 VAC in the
power supply terminal block?
Is the output voltage from the noise fi lter P.C.
board 220 - 230 VAC?
Is the input voltage to the power board 220 -
230 VAC?
Is the input voltage to the outdoor electronic
control P.C. board 325 VDC?
Replace the outdoor electronic control P.C. board.
C2
Is there voltage 220 - 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 9-6.1.)
No
Yes
No
Yes
No
Yes
No
Yes
Rectify indoor/outdoor
connecting wire.
Yes
Yes
If light up, OK.
If fl ash, refer to 9-3.
Check the power supply cable.
Is fuse (F64) blown?
Yes
Replace the fuse.
Replace the reactor.
Replace the power board.
42
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)
Replace the noise fi lter
No P.C. board.