Mitsubishi Electric SVZ-KP18NA Service Manual page 27

J Check of power supply
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
the TEST button twice.
Does the POWER lamp on remote
controller 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.TEST POINT DIAGRAM AND VOLTAGE.")
No
Check the electric parts in main circuit.
TCH022
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 to "10-6.TEST
Yes
POINT DIAGRAM AND VOLTAGE.")
Yes
If light up, OK.
If fl ash, refer to "10-3. HOW TO
PROCEED "SELF-DIAGNOSIS"".
27
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)