Product specifications

21Samsung Electronics

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

Unplug the power cord and

plug it after 5 seconds

Press the Power Button on the

remote control unit to

operate the air conditioner

Check whether two wires

of power cord are

connected correctly to the

terminal block and control board.

Check whether the fuse on the

control board is normal.

FUSE: 3.15[A]/250[V]

Check the output of SMPS

on the control board.

Input power: AC230±15%[V]

IC02 Input: DC 12[V]

IC02 output: DC 5[V]

◆ Check the setting temperature

◆ Check the indoor unit

control board

◆ Check the display board

Reconnect wires correctly

Replace fuse

PCB should be replaced

operate

does not operate

Yes

6-2 Fault Diagnosis by Symptom

6-2-1 No Power (completely dead)-Initial diagnosis

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