Check Of Power Supply - Mitsubishi Electric MUZ-GE09NA Service Manual

J Check of power supply
MUZ-GE09/12/15NA/NA2/NAH/NAH2 MUZ-GE18NA/NAH
MUY-GE09/12/15NA/NA2 MUY-GE18NA
Disconnect the connector (CN61) between
compressor and intelligent power module/
power module 1.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does The upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Yes
Is there bus-bar voltage 260-325
VDC between DB61 (+) and DB61 (–)
on the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
MUZ-GE24NA
MUY-GE24NA
Disconnect the connector between
compressor and intelligent power module/
power module 1.
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 294 - 370
VDC between JP715 (+) and JP30 (–)
on the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
OBH549F
1
Intelligent power module: MUZ-GE09/12/15/18/24NA, MUY-GE09/12/15/18/24NA
Power module: Other models
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 208/230 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 10-6.1.)
Yes
If LED lights up, it is OK.
If LED fl ashes, refer to 10-3.
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 208/230 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 10-6.1.)
Yes
If LED lights up, it is OK.
If LED fl ashes, refer to 10-3.
294 -370 VDC
56
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
260-325 VDC
DB61
Inverter P.C. board
(Solder side)
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No P.C. board.
JP30 JP715