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5. Flow Chart of Troubleshooting and Circuit Diagrams
5-1 Power ON
'POWER ON'does not work
Check the Battery Voltage
is more than 3.2V
When the "END" key is
pressed, the voltage of "D304 pin1"
U474 pin 2,3 > 3.2V
U623 pin5
U622 pin5
Check for the clock signal at R107
Check the initial operation
SGH-N500 Flow Chart of Troubleshooting and Circuit Diagrams
Yes
Yes
3.6V?
Yes
Yes
3.0 V ?
Yes
3.0 V ?
Yes
Yes
END
No
Charge the Battery
No
Replace Keypad
No
Check the circuit related to U474
No
Check the circuit related to U623
No
Check U622 and related circuit
No
Check the clock generation circuit
(related to U100 and Q100)
5-1
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