Samsung NA-C10 Service Manual page 4

8. Troubleshooting
8-1 Power Malfunction
Main PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,47,90
Yes
Main PCB
Does UX1(6MHz)
oscillate?
Yes
Main PCB
When the power is
ON 'H' displays
at pin no. 5 ?(5V)
Yes
Connect Top PCB and Main PCB.
Check the connector Main PCB.
Wafer ucw3
Samsung Electronics
No
Top PCB ARIC1(K7805) IN: 10V
Input voltage normal?
Replace ARIC1
No
Main PCB PWR-SENS
voltage normal ?
(pin no. 27;5V)
No
Replace µ-com.
No
Check the Power PCB : P/T, FUSE
No
Yes
No
Yes
Check the Power PCB ;
ARD 1, 2, 3, 4 (IN5392)
AF2 (1.25A Fuse)
Check the Main PCB
ARZD1, ARR 7, ARR6
ARD5, ARC5, 12
8-1