Product specifications

Samsung Electronics20

5-3 Breakdown diagnosis by symptoms

5-3-1 No Power (completely dead)-Initial diagnosis

1. Checklist :

1) Is input voltage normal?

2) Is AC power linked correctly?

3) Is input voltage of DC regulator IC KA7805 (IC02) normal? (11VDC-12.5VDC)

4) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)

2. Troubleshooting procedure

does not operate

Yes

Unplug the power cord and plug it after 5 seconds

◆ Check the setting temperature

operate

◆ Check the display board

◆ Check the indoor unit control board

Reconnect wires correctly

Check whether two wires

of power cord are connected correctly to the

terminal block and control board.

Press the Power Button on

the remote control unit to operate the air

conditioner

Replace fuse

Check whether the fuse on the

control board is normal.

F701: 3.15[A]/250[V]

Replace the control board

Check the output of

SMPS on the control board.

Input power: AC230±15%[V]

IC02 Input: DC 12[V]

IC02 output: DC 5[V]

DB98_15924A(3)_1 4/6/04 3:00 PM Page 20