Mitsubishi Electric MSZ-FH25VE2-E1 Service Manual page 30

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?
No
Turn OFF the power supply.
Check both "parts side" and "pattern
side" of the indoor power P.C. board
visually.
Measure the resistance of
resistor (R111) on the indoor
power P.C. board.
Indoor power Fuse (F11)
P.C. board
CN211
Indoor electronic
control P.C. board
GND(JPG)
OBH623D
Measure the resistance of indoor fan
motor.
Refer to 10-5.
Measure the resistance of the vane
motor coil.
Yes
Refer to 10-5.
Measure the resistance of the i-see
SENSOR MOTOR coil. Refer 10-5.
Replace the varistor (NR11)
and fuse (F11). 3
Yes
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
Yes
Measure the resistance between
CN211 (+) and (-) of indoor fan
motor connector. 1, 2
Is the resistance 1MΩ or more?
Yes
Replace the fuse (F11). 3
Is the resistance of
resistor (R111) approximately
3.9 Ω ?
Varistor
(NR11)
Is there approximately 5 VDC between
5 V (+) and JPG (GND) (-) of the
indoor electronic control P.C. board?
Is there approximately 12 VDC
R111
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-
CN102
nected?
Replace the indoor electronic control P.C. board.
30
Short circuit:
Replace the indoor fan motor.
Short circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
Short circuit
Replace the i-see SENSOR MOTOR and
the indoor electronic P.C. board.
No
No
1. The fan motor connector's
whereas is black.
2. Connect "+" of the tester to fan motor connector's
lead wire, and "-" to
resistance cannot be measured properly.
3. Please replace the fuse after removing the indoor
power P.C. board from the electrical box.
Replace the fuse (F11) and the
No indoor fan motor. 3
Replace the indoor
power P.C. board and
No
the indoor fan motor.
Yes
Replace the indoor fan motor.
Yes
No
Connect the connector or repair discon-
Yes nection.
No
lead wire is red,
lead wire, otherwise the