Mitsubishi Electronics MXZ-24UV User Manual download pdf (Page 28)

Check of serial signal

Turn on power supply

Yes

Start

Check the connecting of main circuit parts and connector (CN501: I.P.M P. C. board,

CN 801: Electronic control P. C. board, CN554: relay P. C. board)

Is there voltage of 230V AC in the

power supply terminal block?

Is there voltage of 310V DC - 340V DC

across the smoothing capacity?

Is there voltage of 230V AC across

the output cable (LD63, LD64) in the

noise filter P. C. board?

Check the power supply cable.

Check the main circuit parts

and replace it.

Replace the electronic control P. C. board.

Replace the noise

filter P. C. board

Is there voltage of 230V AC across

the input terminal part in the diode

module (DS61)?

Replace the current

limiting resistor.

w When replacing, check the

connection of connector

CN720 in the outdoor

electronic control P. C.

board

Check of power supply

Yes

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 connector (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.

Replace the electronic control P. C. board.

Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.

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

Outdoor unit does not operate. (LED display:

0000

)

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Mitsubishi Electronics MXZ-24UV User Manual Page 28

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