User Guide

5. Flow Chart of Troubleshooting and Circuit Diagrams
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
Check the Dome sheet
When the "END" key is
pressed, the voltage of "D304 pin1"
3.6V?
No
Yes
U474 pin 2,3 > 3.2V Check the circuit related to U474
No
END
U619 pin 5 3.0 V ? Check the circuit related to U619
No
Yes
Check the initial operation
U620 pin 5 3.0 V ? Check U620 and related circuit
No
Yes
Check for the clock signal at R107
Check the clock generation circuit
(related to U100 and Q100)
No
Yes
Yes