5. Flow Chart of Troubleshooting
5-1 Power ON
Flow Chart of Troubleshooting and Circuit Diagrams
5-1
'POWER ON'does not work
Charge the Battery
Check the Battery Voltage
is more than 3.2V
No
Yes
Yes
Replace Keypad
When the "END" key is
pressed, the voltage of "D109 pin1"
3.6V?
No
Yes
U101 pin 2,3 > 3.2V
Check the circuit related to U101
No
END
U103 pin 1 3.0 V ?
Check the circuit related to U103
No
Yes
Check the initial operation
U103 pin2 3.0 V ?
Check U103 and related circuit
No
Yes
Check for the clock signal at R320
Check the clock generation circuit
(related to U305 and Q301)
No
Yes
Yes