Samsung YP-P2, Руководство по обслуживанию

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Samsung Electronics 4-1
Troubleshooting
4. Troubleshooting
4-1 Checkpoints by Error Mode
Oscilloscope Setting Values
Voltage/DIV 2V/div
TIME/DIV 1m/div
4-1-1 No Power
Symptom
Power does not turn on
Major Checklist
1
Check the power terminal connection (battery, adapter).
2
Check if the key signal is ‘HIGH’ when the POWER key is pressed. (2.5V ~ 3.1V)
3
Check if the ENABLE pin signal of the DDCON IC is ‘HIGH’. (2.5V ~ 3.1V)
4
Check power.
(L300: 2.8V(MAIN), L301: 1.07V(CORE), L302: 1.8V(MEMORY), L303: 3.1V(LCD))
Caution
Be careful not to short anything out when checking the power line.

Refer to wave pattern
image of Table 4-1.
Does the power turn on after
recharging the battery?
Yes
No
Completion
The power does not turn on.
After insert battery to PCB,
Please TEST
No
1
Is battery inserted to Main PCB
normally?
A
Yes