Multi F Four-Way Ceiling Cassette Service Manual

- 45 -

Only for training and service purposes

LGE Internal Use Only

Part 5. Trouble Shooting

6.1 The Product doesn’t operate at all

The operation check of the Indoor PCB Assembly

Procedure

1) The input voltage of power mod-

ule.

2) The output voltage of power mod-

ule.

4) IC04D(7805)

5) IC01A(KIA7036)

Specification

1) AC230V ± 30V

: Check the rated voltage

2) 12V ± 3V

4) DC5V

5) The voltage of micom pin 19

: DC4.5V↑

Remedy

1) Check the power outlet.

2) Replace

PCB Assembly

4) Replace PCB Assembly

5) Replace PCB Assembly

Turn on the main power again.

Turn off the main power and

wait for 10 seconds.

Yes

A "Beeping" sound is made

from the indoor unit

Check the voltage of power supply (AC220V/AC240V, 50Hz) and check

for the following :

* The voltage of main power supply.

* The voltage applied to the unit.

* The connecting method of Indoor/Outdoor connecting cable (each color)

* The PCB Assembly (Fuse, Noise Filter, Power Module, Bridge Diode, etc.)

Primarily, the operating condition of

Micom is O.K.

* Check, Remote controller & Receiver.

* Check CN-DISP1, CN-DISP2 of

indoor PCB

6. Electronic Parts