Mitsubishi Electric MSC-C07TV Service Manual page 53

Check of indoor fan motor
A
Indoor fan motor doesn't operate.
No
Are lead wires connected?
Reconnect the lead wires.
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.3 and then No.2 and No.3.
Check of remote controller and power monitor, receiver P.C. board
B
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn't operate with the remote
controller.
wCheck the remote controller is exclusive for this air conditioner.
wIn case of replacing the power monitor, receiver P.C. board, replace the indoor electronic control P.C. board with it because
they are unified.
Switch on the remote controller.
Is LCD display on the remote con-
troller visible?
Yes
Remove batteries, then set them back and
press the RESET button.
Check if the unit operates with the remote
controller.
Does the unit operate with the
remote controller?
Yes
OK
Turn OFF the power supply.
Check connector CN211 visually.
Yes
Is resistance 0 (short circuit) or ∞ (open circuit)?
Repair or replace the indoor fan motor.
No
Replace the batteries.(Refer to page 48.)
(not clear)
No
Turn on a radio to AM and press switch on
the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Replace the indoor electronic control P.C.
board with power monitor, receiver P.C.
board.
Is soldered point of the connector
Yes ( 0 or ∞ ) (others)
No
Yes
Yes
No
53
correctly soldered?
Yes
Resolder it.
Replace the indoor electronic con-
trol P.C. board.
No
Replace the remote controller.
• Re-install the unit away from lights.
• Attach a filter on receiving part.
No