MITSUBISHI ELECTRIC MUZ-GB50VA - Manual (Page 27)

27
D D
Check of outdoor fan motor
• Fan motor does not operate or stops operating shortly after starting the operation.
Yes
No
No
Yes
Yes
No
(Fixed to either 5V or 0V DC)
Check the connection between the
connector CN931 and CN932.
Disconnect CN932 from outdoor electronic control P.C. board, and
turn on the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between
1 (+) and 5 (-)
Between 2 (+) and 5 (-)
Between 3 (+) and 5 (-)
Is the resistance between each terminal
of outdoor fan motor normal?
Does the outdoor fan motor rotates smoothly?
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
Replace the outdoor DC fan motor. Replace the outdoor electronic control P.C. board.
E E Check of power supply
Outdoor unit does not operate. (LED display: display OFF)
Turn on power supply.
No
Yes
Yes
No No
Yes
No
Yes
Yes
No
Replace the power board.
Check the connecting of parts of main power supply circuit.
Is there voltage of 230V AC in the
power supply terminal block?
Is the output voltage from the noise
filter P.C. board 230V AC?
Is the input voltage to the outdoor
electronic control P.C. board 325V DC?
Check the power supply cable.
Replace the outdoor electronic control
P.C. board.
Replace the noise
filter P.C. board.
Is fuse (F64) blown?
Is the input voltage to the power board
230V AC?
Replace the fuse.
Replace the reactor.
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