Samsung SH09AS2 - Fault Diagnosis by Symptom

SAMSUNG | 79
TROUBLESHOOTING
8
Troubleshooting for Non Inverter (cont.)
8-1-2. Fault Diagnosis by Symptom
■ 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 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
Yes
Yes
No
No
No
DB98_16444A(1)_2 2/9/04 10:05 AM Page 79