Check Of Power Supply - Mitsubishi Electric MUZ-GL09NA-U1 Service Manual

J Check of power supply
Disconnect the connector between the
compressor and the power module
(IC700) (MUZ-GL09/12/15/18, MUY-
GL09/12/15/18)/IGBT module (IC700)
(MUZ-GL24, MUY-GL24).
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the upper lamp of the
OPERATION INDICATOR lamp on
the indoor unit light up?
Yes
Is there DC voltage 260 - 370 VDC
between DB61 (+) and DB61 (–)
(MUZ-GL09/12/15/18, MUY-
GL09/12/15/18)/294 - 370 VDC
between JP715 (+) and JP30 (–)
(MUZ-GL24, MUY-GL24) on the
inverter P.C. board? (Refer to 10-6.1.)
No
Check the electric parts in main circuit.
260 - 370 VDC
DB61
Inverter P.C. board
(Solder side)
MUZ-GL09/12/15/18NA
MUZ-GL09/12/15/18NAH
MUY-GL09/12/15/18NA
OBH733D
Rectify indoor/outdoor
connecting wire.
No
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?
Yes
(Refer to 10-6.1.)
Yes
If lights up, OK.
If fl ashes, refer to 10-3.
JP715
294 -370 VDC
MUZ-GL24NA
MUZ-GL24NAH
MUY-GL24NA
54
Replace the indoor
electronic control P.C.
Yes
board.
Replace the inverter
No P.C. board.
JP30