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5. Flow Chart of Troubleshooting and Circuit Diagram
5-1 Power ON
'POWER ON'does not work
Charge the Battery
Check the Battery Voltage
is more than 3.4V?
No
Yes
Yes
Check U100 and the path from +VBATT
to BAT101
The node
between D100 and BAT101 > 2.8 V ?
No
Yes
When the "END" key is pressed,
D101 pin3 > 3.4V ?
Replace the PBA
No
END
U101 pin 2, 3 > 3.4V ?
Check the circuit related to U101
No
Yes
Check the initial operation
U463 pin1, 3 = 3.0 V ?
Check U101 and related circuit
No
Yes
Check for the clock signal at R504
Check the clock generation circuit
(related to U500 and Q500)
No
Yes
Yes
5-1
Exploded Views and Parts List