Mitsubishi Electronics MS-GD08ND-ci service manual Troubleshooting, Lead wiring Housing point

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TROUBLESHOOTING

MS-GD08ND- MS-GD10ND- MS-GD12ND-

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8-1. Cautions on troubleshooting

1.Before troubleshooting, check the following:

1)Check the power supply voltage.

2)Check the indoor/outdoor connecting wire for mis-wiring.

2.Take care the following during servicing.

1)Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2)Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel and the electronic control P.C. board.

3)When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4)When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring Housing point

3.Troubleshooting procedure

1)First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2)Before servicing that the connector and terminal are connected properly.

3)If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration.

4)When troubleshooting, refer to 8-2. and 8-3.

4.How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

1Remove the back lid and insert batteries. Then reattach the back lid.

2 Press the RESET button with tip end of ball point pen or the like, and then use the remote controller.

Insert the negative pole
of the batteries first.
Check if the polarity of	RESET button
the batteries are correct.

NOTE : 1. If the RESET button is not pressed, the remote controller may not operate correctly.

2.This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.

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