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5. Flow Chart of Troubleshooting and Circuit Diagram
5-1 Power ON
'POWER ON'does not work
Check the Battery Voltage
between D100 and BAT101 > 2.8 V ?
When the "END" key is pressed,
U101 pin 2, 3 > 3.4V ?
U463 pin1, 3 = 3.0 V ?
Check for the clock signal at R504
Check the initial operation
4-4
Yes
is more than 3.4V?
Yes
The node
Yes
D101 pin3 > 3.4V ?
Yes
Yes
Yes
Yes
END
No
Charge the Battery
No
Check U104 and the path from +VBATT
to BAT101
No
Replace the PBA
No
Check the circuit related to U101
No
Check U101 and related circuit
No
Check the clock generation circuit
(related to U500 and Q500)
Block Diagrams
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