Service manual

95
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Check of remote controller and receiver P.C. board
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.
Yes
Replace the batteries. (Refer to page 88.)
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 remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
Switch on the remote controller.
Is LCD display on the remote con-
troller displayed?
Remove batteries, then set them back and press the RESET
button. Check if the unit operates with the remote controller.
Yes
Does the unit operate with the
remote controller?
Yes
OK
No
(not clear)
Yes
No
No
Yes
Measure the voltage between receiver P.C. board connector CN302
No.3
(–)
and No.5
(+)
when the remote controller button is pressed.
Is the voltage approx. 4V DC?
Replace the indoor electronic control
P.C. board.
Replace the receiver P.C. board.
No(5V or 0V DC)
No
wCheck the remote controller is exclusive for this air conditioner.
AA
Check of indoor fan motor
Is soldered point of the
connector correctly soldered?
Is resistance 0 (short circuit) or ∞ (open circuit)?
Yes ( 0 or ∞ )
Yes
No
Yes
No
Turn OFF the power supply.
Check connector CN211 visually.
Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.5 and then No.3 and No.5.
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan motor doesn’t operate.
Turn ON the power supply. Stop it if the unit operates.
Insert screwdriver into air outlet to rotate indoor fan
motor slowly for 1 revolution or over, and measure volt-
age No.2(+) and No.3(-) on CN121.
No
(others)
Replace the indoor electronic control P.C. board.
Does voltage repeat 0V DC and 5V DC?
Yes
No
Are lead wires connected?
Reconnect the lead wires.
Resolder it.
Repair or replace the indoor fan motor.
OB307C-4.qxp 04.5.11 1:19 PM Page 95