Mitsubishi Electric MXZ-2C30VA, Service Manual

Page: 107 / 396

107
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Yes
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Disconnect CN931 and measure the
resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to right table)
Turn on the power supply to start operation
and measure the voltage of connector CN931.
Turn OFF the power supply and connect
the connector CN931.
Turn ON the power supply and measure
the voltage of connector CN931 while
rotating the motor by the hand.
Does the outdoor fan motor rotate smoothly?
Replace the outdoor fan motor.
Resistance
60 k Ω
160 k Ω
Measuring points
* To measure the resistance, connect
the negative (-) end of the tester to pin 4.
* To measure the voltage, connect the negative (-)
end of the tester to pin 4.
* Voltage between pin 4 and 6 should be measured
within 1 minute after the operation starts.
pin 1 - pin 4
pin 5 - pin 4
pin 6 - pin 4
pin 7 - pin 4
Voltage
15 VDC
325 VDC
1 - 5 VDC
CN931
pin 1 - pin 4
pin 5 - pin 4
pin 6 - pin 4
Is the voltage of connector CN931
normal? (Refer to right table.)
Does the voltage between pin 7 and pin 4
of connector CN931 repeat 0V and 5V?
Replace the outdoor fan motor.
Does the fan motor operate for about
5 seconds?
Replace the outdoor fan motor.
Replace the outdoor fan motor.
Start operation.
Replace the control P.C. board or outdoor
control P.C. board.
Replace the control P.C. board or outdoor
control P.C. board.
MXZ-6C120/6C122VA
CN931 Control P.C.
board
MXZ-6C120
Outdoor control
P.C. board
MXZ-6C122
OBH584G