H97 (Outdoor Fan Motor – Dc Motor Mechanism Locked) - Panasonic CS-XE9WKUAW Service Manual

16.4.15 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked) (CU-XE9 ~ 12WKUA)
Malfunction Decision Conditions

The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor.
Malfunction Caused

Operation stops due to short circuit inside the fan motor winding.

Operation stops due to breaking of wire inside the fan motor.

Operation stops due to breaking of fan motor lead wires.

Operation stops due to Hall IC malfunction.

Operation error due to faulty outdoor unit PCB.
Troubleshooting
When abnormality indication starts again
Turn off power supply and rotate fan by
hand.
Does fan rotate smoothly?
YES
Turn power supply on and operate fan.
Does it rotate?
YES
Stop the fan motor
Check the rotation feedback output from
fan motor's CN-MTR1 output.
Rotate the fan motor manually (by hand)
while measure the voltage at PCB's
CN-MRT1
- Between 1(+) and 5(-)
- Between 2(+) and 5(-)
- Between 3(+) and 5(-)
For safety reason and to prevent
Caution component breakdown, always switch
off the power before remove and
connect the component.
NO
Replace fan motor.
NO
105
FAN
MOTOR
MS
3 ~
Turn off power supply and
disconnect fan motor CN-MRT2
connector.
Check resistance of the motor.
Measure at fan motor connector
CN-MRT1 (1-2, 1-3, 2-3).
Is the resistance normal?
YES
Use an inverter check to check on
the power transistor on board.
Connect it to PCB's CN-MRT2 port.
Turn power ON and run the unit.
Do all 6 LED light turn ON and turn
OFF periodically?
Does the voltage at each terminal
becomes 5 and 0Vdc repeatedly?
10
1
W
3
U
5
14
V
CN-MTR2
16
(WHT)
IC19
5V
CN-MTR1
(RED)
R403
1
3
C41 4
C401
G6
G5
U
V
W
NO
Replace fan motor.
NO
Replace outdoor PCB.
YES
Replace fan motor.
NO
Replace fan motor.
YES
Replace outdoor PCB.