Mitsubishi Electric MS-A18VD, Руководство по обслуживанию

Страница: 16 / 28

16
Yes
B B
Check of remote controller and receiver P.C. board
w
Check if the remote controller is exclusive for this air conditioner.
Replace the batteries
(Refer to 8-1.4.).
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?
Measure the voltage between receiver P.C. board connector CN301 No.1
(
+
)
and No.3
(
-
)
when
the remote controller button is pressed (Refer to 8-6.).
Is the voltage approximately 4 VDC?
Replace the indoor electronic control
P.C. board
Replace the receiver P.C.board.
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 visible?
Remove batteries, then set them back and
press the RESET button.
Check if the unit operates with remote con-
troller.
Yes
Does the unit operate with remote
controller?
Yes
OK
No
(not clear)
Yes
No
No
No (5V or 0 VDC)
No
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.
Yes
A A
Check of indoor fan motor
Turn OFF the power supply.
Check connector CN211 visually.
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4.
Are lead wires connected?
Is soldered point of the connector
correctly soldered?
Resolder it.
Yes
No
No
Yes
Reconnect the lead wires.
Repair the indoor fan motor.
Is resistance 0 (short circuit) or
∞
(open circuit)?
Yes ( 0 or
∞
)
No
(others)
Turn ON the power supply.
Stop it if the unit operate. Insert screwdriver into
air outlet to rotate indoor fan motor slowly for 1
revolution or over, and measure voltage No.2(+)
and No.3(-) on CN121.
Replace the indoor electronic control P.C. board.
Does voltage repeat 0 VDC and 5 VDC?
Yes
No
8-5. Troubleshooting flow
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan motor does not operate.
OB400C--1.qxp 11.7.22 10:13 AM Page 16
OB400C