Fault Diagnosis By Symptom; No Power(Completely Dead)-Initial Diagnosis - Samsung ASH-0906ER Service Manual

5-2 Fault Diagnosis by Symptom

5-2-1 No Power(completely dead)-Initial diagnosis

1) Checklist :
(1) Is input voltage normal?(198-264V~)
(2) Is AC power linked correctly?
(3) Are connections between primary side, secondary side of the power transformer and PCB
good.
(4) Is output voltage of DC regulator IC KA7812(IC05) normal? (11.5VDC-12.5VDC)
(5) Is output voltage of DC regulator IC KA7805(IC06) normal? (4.5VDC-5.5VDC)
2) Troubleshooting procedure
Remove power cord and plug in again in approx. 5 seconds
Is operation lamp blinking in 3minutes and then lamp off?
Is transmission display (
when run/stop botton pushed?
Does operation start when run/stop button on the
remote control unit pushed?
N
DC voltage of receiver-module output normal?
(squarewave)
Refer to remote control unit fault diagnosis
5-2
Y
) of the remote control unit blinking
Y
N
Y
Refer to page 5-4~5-6
N
DC voltage of DISPLAY PCB normal?
Y
Ass'y Display PCB replace
Samsung Electronics
N