Service manual

27
Check of indoor fan motor
A
Check of remote controller and receiver P.C. board
B
Indoor fan motor does not operate.
Turn OFF power supply.
Check connector (Fan motor) visually.
Repair or replace the indoor fan motor.
Disconnect lead wires from connector (Fan motor) on indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.
Are lead wires connected?
Re-connect the lead
wires.
Is soldered point of the connector
correctly soldered?
Replace the indoor electronic control
P.C. board.
Re-solder it.
Is resistance 0 (short circuit) or ∞ (open circuit)?
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote con-
troller.
Yes ( 0 or ∞ )
No
(others)
Yes
No
Yes
No
● Re-install the unit away from lights.
● Attach a filter on receiving part.
Switch on the remote controller.
Is LCD display on remote
controller visible?
Replace the batteries.(Refer to page 24.)
Remove batteries, then set them back and press
the RESET button.
Check if the unit operates with remote controller.
Does the unit operate with remote controller?
Turn on a radio to AM and press
switch on remote controller.
Is noise heard from radio? Replace the remote controller.
Are there any fluorescent lights
of inverter or rapid-start type
within the range of 1m?
Measure the voltage between receiver P.C.board connector No.2(+)and No.1 when remote controller button is pressed.
Is the voltage approx. 4V DC?
No
(5V DC or 0V DC)
Replace the disp/receiver
P.C. board.
No
(not clear)
Yes
Yes
No
OK
No
Yes
Yes
Yes
No
Replace the indoor electronic control P.C. board.
w Check if the remote controller is exclusive for this air conditioner.
OB286-1.qxp 02.7.23 11:04 AM Page 27