Troubleshooting Flow; A A Check Of Power Supply - Mitsubishi Electric MXZ-2A40VA Service Manual

13-6. Troubleshooting flow

Outdoor unit does not operate. (LED display: display OFF)

A A Check of power supply

MXZ-2A40/2A54
Check the connecting of parts of main power supply circuit.
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is the output voltage from the power
P.C. board 230V AC?
Yes
Is the input voltage to the inverter P.C.
board 230V AC?
Yes
Replace the inverter P.C. board.
MXZ-3A54/4A71/4A80
Check the connecting of parts of main power supply circuit.
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is the output voltage from the noise
filter P.C. board 230V AC?
Yes
Is the input voltage to the power board
230V AC?
Yes
Is the input voltage to the outdoor
electronic control P.C. board 325V DC?
Yes
Replace the outdoor electronic control
P.C. board.
No
Check the power supply cable.
Is fuse (F61 or F64)
No
blown?
Yes
Replace the fuse.
No
Replace the reactor.
No
Check the power supply cable.
No
Is fuse (F64) blown?
Yes
Replace the fuse.
No
Replace the reactor.
No
Replace the power board.
63
Replace the power
No
P.C. board.
Replace the noise
No
filter P.C. board.