Mitsubishi Electric MSZ-EF42VES Manuel de service télécharger pdf (Page 26)

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. 3

Replace the fuse (F11).

Measure the resistance of reactor

(L111) 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 approx. 5 VDC between 5 V

(+) and JPG (GND) (-) of the indoor

electronic control P.C. board? Is there

approximate 9 V to 13 VDC between

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

indoor electronic control P.C. board.

Are connector CN10A 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.

Is the resistance of reactor

(L111) approximate 2.2 Ω ?

Yes

Varistor

(NR11)

CN10A

Indoor electronic

control P.C. board

GND(JPG)

Fuse (F11)

L111

CN211

Indoor power

P.C. board

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Mitsubishi Electric MSZ-EF42VES Manuel de service Page 26

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