Mitsubishi Electric MSC-A07WV-E1 Service Manual page 119

Outdoor unit does not operate. (LED display: display OFF)
J J Check of power supply
Start
Check the connecting of main circuit parts .
Turn on power supply
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is there voltage of 230V AC across the
input terminal part in the diode module
(TAB61 and TAB62)?
Yes
Is there voltage of 325V DC across the
smoothing capacity (C61)?
Yes
Replace the outdoor electronic control
P. C. board.
Outdoor unit does not operate. (LED display: Both LED1 and LED2 lighting)
K K Check of outdoor unit serial signal
Start
1. Check the indoor unit with referring to G How to check mis-wiring and serial signal error.
2. Turn off the power supply of the indoor and outdoor unit and connect the indoor/ outdoor unit connecting wire correctly
3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block, and check the connection
of the connector (CN601: unit A, CN602: unit B) in the control P. C. board.
4. Disconnect the lead wire to the compressor. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION.
Is there voltage from 5V DC - 10V DC between
No. 3 (+) and N (-) in the outdoor terminal block.
Yes
Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.
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No
Check the power supply cable.
No
Is fuse (F61) blown?
Replace the fuse.
Is the resistance ∞ between terminal
No
of reactor (L) ?
Replace the reactor.
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No
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Replace the noise
No
filter P. C. board
Yes
Yes
Replace the outdoor electronic control P. C. board.
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