Samsung YP-P2 Service Manual page 15

Troubleshooting
When power Key is on,
Yes
check key signal as 'HIGH'?
 Refer to wave pattern
image of Table 4-1.
Check DDCON enable
pin signal as 'HIGH'
 Refer to wave pattern
image of Table 4-1.
Yes
Check MAIN 12Mhz clock
Completion
4-2
2
(2.5V~3.1V)
No
3
(2.5V~3.1V)
No
No
Defective
Check power.
No L300: 2.8V(MAIN)
L301: 1.07V(CORE)
L302: 1.8V(MEMORY)
L303: 3.1V(LCD)
Yes
Yes
Check BATTERY power.
IC803(+), IC804(-)
Check power at the BATTERY
(single part).
Recheck after replacing the battery.
A
4
 Refer to wave pattern
Yes
image of Table 4-1.
No
 Refer to wave pattern
image of Table 4-1.
Samsung Electronics