39
OCH727
Notes
· High voltage is applied to the connector (CNF1) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit
board and fan motor.)
Self check
Symptom: The outdoor fan cannot rotate.
1
2
Check method of DC fan motor (fan motor/outdoor controller circuit board)
No
Fail
Fail
Wiring contact check
Contact of fan motor connector (CNF1)
Fuse check
Check the fuse (F5) on outdoor
controller board.
Power supply check (Remove the connector (CNF1))
Measure the voltage in the outdoor controller circuit
board.
TEST POINT
1 : VDC (between 1 (+) and 4 (−) of the fan connector): VDC 280–380 V DC
TEST POINT 2 : VCC (between 5 (+) and 4 (−) of the fan connector): VCC 15 V DC
Replace the defective fan motor.
Replace the outdoor controller board.
Replace the defective fan motor.
Replace the outdoor controller board (C.B)
and the defective fan motor (MF1).
Replace outdoor
controller board.
Replace the defective fan motor.
Is the voltage normal?
Is the resistance abnormal?
Yes
Yes
No
No
Fan motor check (CNF1)
Is there contact failure?
Did the fuse blow?
No
Yes
Check the operation of fan. Complete.
Yes
OK
Check the operation.
OK
UNIT
WM50/WM60/WM85
WM112
FAN MOTOR
Measuring points
pin1–pin4
pin5–pin4
pin6–pin4
pin7–pin4
Resistance
1.1MΩ
40kΩ
BH61J065
Resistance
1.1MΩ
40kΩ
Complete.
9-5. HOW TO CHECK THE COMPONENTS
0.5
2.5 5
2.5
4.5
Vout (V)
PRESSURE
(MPaG)
(PSI)
3
2
1
WT
BU
BK
SENSOR
5 V DC
GND
63HS
Vout
MICRO
PROCESSOR
MULTI
CONTROLLER BOARD
3-1 : 5 V (DC)
2-1 : Output Vout (DC)
<PRESSURE SENSOR>
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