Mitsubishi Electric Mr. Slim MUZ-GE15NA-1, Service Manual

Page: 56 / 74

56
J Check of power supply
Disconnect the connector (CN61) between
compressor and intelligent power module/
power module 1.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
No
Yes
Replace the indoor
electronic control P.C.
board.
Rectify indoor/outdoor
connecting wire.
Yes
If LED lights up, it is OK.
If LED
fl
ashes, refer to 10-3.
Does The upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Does LED on the inverter P.C.
board light up or
fl
ash? (Refer
to 10-6.1.)
No
Replace the inverter
P.C. board.
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.
Yes
Yes
No
Inverter P.C. board
(Solder side)
DB61
260-325 VDC
MUZ-GE09/12/15NA/NA2/NAH/NAH2 MUZ-GE18NA/NAH
MUY-GE09/12/15NA/NA2 MUY-GE18NA
MUZ-GE24NA
MUY-GE24NA
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
No
Yes
Replace the indoor
electronic control P.C.
board.
Rectify indoor/outdoor
connecting wire.
Yes
If LED lights up, it is OK.
If LED
fl
ashes, refer to 10-3.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Does LED on the inverter P.C.
board light up or
fl
ash? (Refer
to 10-6.1.)
No
Replace the inverter
P.C. board.
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.
Yes
Yes
No
Disconnect the connector between
compressor and intelligent power module/
power module 1.
Turn ON power supply and press
EMERGENCY OPERATION switch.
294 -370 VDC
JP30 JP715
1
Intelligent power module:
MUZ-GE09/12/15/18/24NA
,
MUY-GE09/12/15/18/24NA
Power module:
Other models
OBH549F