Mitsubishi Electric PUHZ-SHW80VHA Service Manual page 57

C h ec k meth od of D C fan motor ( fan motor / outdoor c ontroller c irc uit b oard)
1 Notes
· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1, 2) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit
Self check
2
Symptom: The outdoor fan cannot rotate.
F use c h ec k
Check the fuse (F5) on outdoor
controller board.
Did the fuse blow?
No
W iring c ontac t c h ec k
Contact of fan motor connector (CNF1, 2)
Is there contact failure?
No
F an motor c h ec k ( C N F 1 , 2 )
Is the resistance abnormal?
No
P ower sup p ly c h ec k ( R emov e th e c onnec tor ( C N F 1 , 2 ) )
Measure the voltage in the outdoor controller circuit
TEST POINT 1 : V
(between 1 (+ ) and 4 ( ) of the fan connector): V
DC
TEST POINT 2 : V (between 5 (+ ) and 4 ( ) of the fan connector): V
CC
Is the voltage normal?
No
Replace outdoor
controller board.
Check the operation.
NG
Replace the fan motor.
1 0 - 7 . HO W T O C HE C K T HE C O M P O N E N T S
< HI G H P R E S S U R E S E N S O R >
V out (V )
4.5
2.5
0.5
OCH526C
board and fan motor.)
Replace outdoor controller board (C.B )
Y es
and fan motor (MF1, 2).
UNIT 85/ 112V HA
FAN MOTOR RG61V 143
Measuring points Resistance
pin1– pin4
50 k"
pin5– pin4
pin6– pin4 150 k"
pin7 – pin4
Replace the fan motor
Y es
board.
Replace the fan motor.
Y es
Check the operation of fan.
OK
Replace the outdoor controller board.
END
2.5 5
PRESSURE
(MPa)
112/ 140Y HA
280– 380 V DC
DC
15 V DC
CC
Y es
NG
MULTI
CONTROLLER B OARD
5 V DC
3
WHT
2
B LU
V out MICRO
PROCESSOR
1
B LK
GND
63HS
3-1 : 5 V (DC)
2-1 : Output V out (DC)
OK
END