Troubleshooting Flow; Check Of Power Supply - Mitsubishi Electric MXZ-2F33VF-E1 Service Manual

12-6. TROUBLESHOOTING FLOW

Outdoor unit does not operate.

Check of power supply

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 220 - 230 - 240 V AC
in the power supply terminal block?
Yes
Is there voltage of 220 - 230 - 240 V AC
between LD66B and X64
the inverter P.C. board?
Yes
Is there voltage of 220 - 230 - 240 V AC
between LD66A and LD70 on the
inverter P.C. board?
Yes
Is there voltage of 311 - 339 V DC
between DB61 + and DB61
inverter P.C. board?
Yes
Is there voltage of 5 V DC between
CN936 and CN936
outdoor display P.C. board?
Yes
Replace the outdoor display P.C. board.
MXZ-3F54VF/3F68VF/4F72VF
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 220 - 230 - 240 V AC
in the power supply terminal block?
Yes
Is the output voltage from the outdoor
power P.C. board 311 - 339V DC?
No
Turn OFF the power supply and recconnect the reactor.
Is the reactor short-circuited?
Yes
Replace the outdoor power P.C. board.
OBH790
No
Check the power supply and correct them.
No
Replace the inverter P.C. board.
on
No
Replace the reactor.
No
- Replace the inverter P.C. board.
on the
Check the connected wire between
No
the inverter P.C. board and outdoor
on the
display P.C. board and correct it.
Replace the inverter P.C. board.
No
Check the power supply cable.
Yes
Replace the outdoor control P.C. board.
No
Replace the reactor.
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