Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 810

Resolución de averías
Check method of DC fan motor (fan motor / outdoor controller circuit board)
1
Notes
· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Give 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
2
Self check
Symptom : The outdoor fan cannot turn around.
Wiring contact check
Contact of fan motor connector (CNF1, CNF2)
Is there no contact failure?
Yes
Power supply check
Measure the voltage in the outdoor controller circuit
1 : V
TEST POINT
(between 1 (+) and 4 (-) of the fan connector): V
DC
2 : V
TEST POINT
(between 5 (+) and 4 (-) of the fan connector): V
CC
3 : V
TEST POINT
(between 6 (+) and 4 (-) of the fan connector): V
SP
[
The voltage of V is a value during the fan motor operation.
SP
In the case that the fan motor off, the voltages is 0V.
Is the voltage normal?
Yes
Fan motor position sensor signal check
Measure the voltage at the TEST POINT 4 (V
of the fan connector, while slowly turning the fan motor more than one revolution.
Dose the voltage repeat DC0V and DC15V?
Yes
Replacement of the outdoor controller circuit board
810
board and fan motor.)
Wiring recovery
No
board.
]
Trouble of the outdoor controller circuit board
No
Replacement of the outdoor controller circuit board
), between 7 (+) and 4 (-)
FG
Trouble of the fan motor
No
Replacement of the motor
DC280-380V
DC
DC15V
CC
DC1 to 6.5V
SP