Mitsubishi Electric MXZ-2D33VA Service Manual page 138

11-6. TROUBLESHOOTING FLOW
• When outdoor unit does not operate, LED on outdoor P.C. board is not lighting.
Check of power supply
MXZ-2D33VA/2D40VA/2D42VA/2D42VA2/2D53VA/2D53VA2
MXZ-2D53VAH/2D53VAH2
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 230 VAC in the
power supply terminal block?
Yes
Is there voltage of 230 VAC between
LD66B and X64 on the inverter
P.C. board?
Yes
Is there voltage of 230 VAC between
LD66A and LD70 on the inverter
P.C. board?
Yes
Is there voltage of 325 VDC between
DB61 + and DB61
P.C. board?
Yes
Is there voltage of 5 VDC between
CN936 and CN936
outdoor display P.C. board?
Yes
Replace the outdoor display P.C. board.
OBH626K
No
No
No
No
-
on the inverter
No
on the
Check the power supply and correct them.
Replace the inverter P.C. board.
Replace the reactor.
Replace the inverter P.C. board.
Check the connected wire between
the inverter P.C. board and outdoor
display P.C. board and correct it.
Replace the inverter P.C. board.
138