11-2 Fault Diagnosis by Symptom
11-2-1 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
Unplug the power cord and
plug it after 30 seconds
Power Button on the
remote control unit to operate the
Check the indoor unit
2 wires of power cord are
connected correctly to the
terminal block and
the fuse on the control board is normal.
FUSE(F701) : T3.15[A]/250[V]
Check the output of
SMPS on the control board.
Input power: AC230±15%[V]
IC02 Input: DC12[V]
IC02 output: DC5[V]
Check the setting temperature
Samsung Electronics
Press the
air conditioner
does not operate
control board
Yes
Check whether
control board.
Yes
Check whether
Yes
Yes
operate
Check the display board
No
Reconnect wires correctly
No
No
PCB should be replaced
Replace fuse
11-2