Carrier 38VMA Series, Service Manual

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x. Suitable for the Model 38VMA***HDS6-1
Caution:
Turn off the power switch before connecting or disconnecting the connector. Failure to do so could damage
the board.
Check whether the power cord from the power
circuit of fan board to fan board is connected or not
Check whether the lines from the fan motor to the
fan board is connected or not
Check whether the power supply
of ODU is normal or not
YES
Reconnect
NO
YES
YES
YES
Switch off the
power
Check whether the signal lines from main
board to fan board and between fan boards
are connected or not
Check whether the CN2 terminal
DC310V power of fan board is normal or not.
Check whether the PN terminal DC650V power of
fan board is normal or not.
Check whether the green indicator LED1
or LED2 of fan board lights up or not
YES
YES
YES
Check and replace
the power of
fan board
Replace the
fan board
Switch on power
of ODU
NO
NO
NO
Check whether the motor shaft is free or not
Replace the motor
NO
YES
Check whether the screws on the IPM of fan board are
tightened or not
Tighten screws
on the board
NO
NO
NO
Ensure proper
power supply
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