Mitsubishi Electric MSZ-FH50VE - E1 Service Manual download pdf (Page 29)

C Check of indoor P.C. board and indoor fan motor

Turn OFF the power supply.

Remove indoor fan motor connector CN211

from indoor power P.C. board and vane

motor connector CN151 from the indoor

electronic control P.C. board and turn ON

the power supply.

Does the unit operate with the remote

controller?

Does OPERATION INDICATOR lamp light

up by pressing EMERGENCY OPERATION

switch?

Yes

Measure the resistance of indoor fan

motor.

Refer to 10-5.

Short circuit:

Replace the indoor fan motor.

Turn OFF the power supply.

Check both “parts side” and “pattern

side” of the indoor power P.C. board

visually.

Replace the varistor (NR11)

and fuse (F11). 3

Is the varistor (NR11)

burnt and the fuse (F11)

blown?

Yes

Be sure to check both the fuse

and the varistor in any case.

Is the fuse (F11) blown

only?

Measure the resistance between

CN211 (+) and (-) of indoor fan

motor connector.

1, 2

Yes

Is the resistance 1MΩ or more?

Replace the fuse (F11) and the

indoor fan motor.

3No

Replace the fuse (F11). 3

Measure the resistance of

resistor (R111) on the indoor

power P.C. board.

Replace the indoor

power P.C. board and

the indoor fan motor.

Replace the indoor electronic control P.C. board.

Measure the resistance of the vane

motor coil.

Refer to 10-5.

Short circuit:

Replace the vane motor and the indoor

electronic control P.C. board.

1. The fan motor connector's lead wire is red,

whereas is black.

2. Connect "+" of the tester to fan motor connector's

lead wire, and “-” to lead wire, otherwise the

resistance cannot be measured properly.

3. Please replace the fuse after removing the indoor

power P.C. board from the electrical box.

Is the approximately 5 VDC between

5 V (+) and JPG (GND) (-) of the

indoor electronic control P.C. board?

Is there approximately 12 VDC

between 12 V (+) and JPG (GND) (-)

of the indoor electronic control P.C.

board?

Are connector CN102 on the

indoor electronic control P.C.

board or lead wires discon-

nected?

Yes

Replace the indoor fan motor.

Yes

Connect the connector or repair discon-

nection.

Yes

Varistor

(NR11)

Indoor electronic

control P.C. board

GND(JPG)

Fuse (F11)

R111

CN211

Indoor power

P.C. board

CN102

Is the resistance of

resistor (R111) approximately

3.9 Ω ?

Measure the resistance of the i-see

SENSOR MOTOR coil. Refer 10-5.

Short circuit

Replace the i-see SENSOR MOTOR and

the indoor electronic P.C. board.

OBH623A

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 39 40

Comments to this Manuals

No comments

Mitsubishi Electric MSZ-FH50VE - E1 Service Manual Page 29

Comments to this Manuals

Related products and manuals for Split-system air conditioners Mitsubishi Electric MSZ-FH50VE - E1