Check Of Indoor Fan Motor - Mitsubishi Electric MSH-07NV Service Manual

Check of indoor fan motor

A
Inodoor fan does not operate.
No
Are lead wires connected?
Reconnect the lead wires.
Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.
Measure resistance between lead wires
Check of receiver P.C. board
B
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.
Check the model name of remote
controller.
Is LCD display on remote con-
troller visible?
Yes
Remove batteries and then set them back.
Check if the unit operates with remote
controller.
Does the unit operate with remote
controller?
Yes
OK
Turn OFF power supply.
Check connector CN211 visually.
Yes
No.1 and No.4 and then No.1 and No.2(MSH-18/24)
{
No.1 and No.3 and then No.2 and No.3(MSH-07/09/12)
Is resistance 0 (short circuit) or ∞ (open circuit)?
Repair the indoor fan motor.
No
Replace the batteries.(see page 47.)
(not clear)
No
Turn on a radio to AM and press switch on
remote controller.
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
No
Measure the voltage between
{
when remote controller button is pressed.
Is the voltage approx. 4V DC?
No(5V or 0V DC)
Replace the receiver.
Is soldered point nomal?
No
(others)
Yes ( 0 or ∞ )
No
Yes
receiver P.C. board connector No.2
indoor electronic control P.C. board connector LD101 No.2 and JPG(MSH-07/09/12)
Yes
No
Yes
Resolder it.
}
Replace the indoor electronic con-
trol P.C. board.
Replace the remote controller.
Re-install the unit away from lights.
Attach a filter on receiving part.
(+) and No.1(MSH-18/24)
Replace the indoor electronic control P.C.
board.
}
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