Fault Diagnosis By Symptom - Samsung AQV09NSD Service Manual

12-2 Fault Diagnosis by Symptom

12-2-1 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
air conditioner
Check the indoor unit
control board
Check whether
2 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(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
141 Kinderkamack Rd, Park Ridge, NJ 07656 Tel: 201-782-1782 Fax: 201-782-1783 Web: www.amgair.com Email: info@amgair.com
Press the
does not operate
Yes
Yes
Yes
Yes
Air Marketing Group LLC
operate
Check the display board
No
Reconnect wires correctly
No
Replace fuse
No
PCB should be replaced
12-2