Toshiba MXZ-2DM40VA Service Manual page 41

MXZ-3DM50VA
Disconnect CN931 and measure the
resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to right table)
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Turn on the power supply to start operation
and measure the voltage of connector CN931.
Is the voltage of connector CN931
normal? (Refer to right table.)
Yes
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 voltage between pin7 and pin4 of
connector CN931 repeat 0 VDC and 5 VDC?
Yes
Start operation.
Does the fan motor operate for about
5 seconds?
Yes
Replace the outdoor control P.C. board.
OBH739A
No
Replace the outdoor fan motor.
No
Replace the outdoor fan motor.
CN931 Voltage
pin1 - pin4 325 VDC
pin5 - pin4 15 VDC
pin6 - pin4 1 - 5 VDC
* To measure the voltage, connect the negative (-) end of the tester to pin4.
* Voltage between pin4 and 6 should be measured within 1 minute
after the operation starts.
No
Replace the outdoor control P.C. board.
No
Replace the outdoor fan motor.
No
Replace the outdoor fan motor.
41
CN931 Outdoor control P.C. board
Measuring points Resistance
pin1 - pin4
pin5 - pin4
pin6 - pin4
pin7 - pin4
* To measure the resistance, connect
the negative (-) end of the tester to pin4.