Mitsubishi Electric MSZ-A09RV-E1 Service Manual page 49

(How to check main parts)
F
Check of indoor fan motor.
Indoor fan does not operate.
Turn off power
supply and check
connector CN
211 visually.
G
Check of remote controller and indoor electronic control P.C. board.
Indoor unit operates by pressing the Emergency operation switch, but does not operate with the remote controller.
Check the model
name of remote
controller.
No
Is LCD display on
(not clear)
remote controller
visible?
Yes
Remove batteries and set them back.
Check again if indoor unit operates
with remote controller.
Tune a radio in
Does the unit
No
to AM and press
operate with
OPERATE/STOP
remote
button on remote
controller?
controller.
Yes
Normal
Are lead wires
dis connected?
Lead wires are
Yes
No
not properly
connectes
Is soldered
point
abnormal?
Connector is
Yes
not properly
soldered.
Replace batteries and
then press RESET
button.
See page 32.
Are there any
Is noise
fluorescent lights
Yes
heard from
of inverter or
radio start type
the radio?
within 1 meter?
No
Remote
Re-install the unit
controller defect
away from the lights.
Attach a filter to light-
intercepting part.
Disconnect lead wires from
CN 211 on indoor electronic
control P.C. board.
No
Measure resistance
between lead wire 1 and 3
and then 2 and 3.
CN211
3
2
indoor electronic
control P.C. board 1
( )
back side of
remote controller
Model name and
part No.
are witten here
Turn on power to indoor unit,
and measure voltage
between connector LD 101
No
2 (+) and JPG(-1) on indoor
control P.C. board when
OPERATE/STOP button on
remote controller is pressed.
Yes
light-interception
ihdication board
remote
controller
49
Indoor fan motor
defect
Yes
Is resistance
0" (short) or "
(open) ?
No
Indoor
electronic
control P.C.
board defect.
fan
motor
Indoor
Yes
Is voltage
electronic
approx.
control P.C.
+4V DC?
board defect.
No (+5V DC)
Receiver
defect
LD101
1 1
2 2
Indoor electronic
3 3
control P.C. board
4 4
5 5