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Mitsubishi Electric MXZ-24UV -E2 Service Manual page 28

Inverter-controlled multi system
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Outdoor unit does not operate. (LED display: display OFF)
A A Check of power supply
Start
Check the connecting of main circuit parts and connectors (CN501: I.P.M P. C. board,
CN 801: Electronic control P. C. board, CN554: relay P. C. board).
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is there voltage of 310V DC - 340V DC
across the smoothing capacity?
Yes
Replace the electronic control P. C. board.
Outdoor unit does not operate. (LED display: 0 0 0 0 )
B B Check of serial signal
Start
1. Check the indoor unit with referring to the indoor unit service manual.
2. Turn off the power supply of the indoor and outdoor unit and return the indoor/ outdoor unit
connecting wire to former original.
3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block,
and check the connection of the connectors (CN601: unit A, CN 602: unit B, CN603: unit C,) in
the electronic control P. C. board.
4. Disconnect the lead wire to the compressor. Turn on the power supply (indoor/ outdoor unit)
3 minutes later, EMERGENCY OPERATION starts.
Is there voltage of 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.
No
Check the power supply cable.
Is there voltage of 230V AC across
No
the output cables (LD63, LD64) in the
noise filter P. C. board?
Yes
Is there voltage of 230V AC across
the input terminal part in the diode
module (DS61)?
Yes
Check the main circuit parts
and replace it.
No
Replace the electronic control P. C. board.
28
No
Replace the noise
filter P. C. board.
No
Replace the current
limiting resistor.
w When replacing, check the
connection of connector
CN720 in the outdoor
electronic control P. C.
board.

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