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5. Flow Chart of Troubleshooting and Circuit Diagrams
5-1 Power ON
'POWER ON'does not work
Check the Battery Voltage
When the "END" key is
pressed, the voltage of "D304 pin1"
U619 pin 5
U620 pin 5
Check for the clock signal at R107
Check the initial operation
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
is more than 3.2V
Yes
3.6V?
Yes
U474 pin 2,3 > 3.2V
Yes
3.0 V ?
Yes
3.0 V ?
Yes
Yes
END
No
Charge the Battery
No
Check the Dome sheet
No
Check the circuit related to U474
No
Check the circuit related to U619
No
Check U620 and related circuit
No
Check the clock generation circuit
(related to U100 and Q100)
5-1
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