User Guide

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
Ye s
Ye s
Check U100 and the path from +VBATT
to C106
The node
between D101 and C106 > 2.8 V ?
No
Ye s
When the "END" key is pressed,
D100 pin1 > 3.4V ?
Replace the PBA
No
END
Ye s
Check the initial operation
U111, U112 pin5 = 2.5V ? Check U111, U112 and related circuit
No
Check for the clock signal at R609
Check the clock generation circuit
(related to U502 and U601)
No
Ye s
Ye s
5-1 Flow chart of Troubleshooting and Circuit Diagram