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5. Flow Chart of Troubleshooting and Circuit Diagrams
5-1 Power ON
'POWER ON'does not work
Yes
Check the Battery Voltage is more than 3.2V
No
Charge the Battery
Yes
When the "END" key is pressed, the voltage of "D304 pin1" 3.6V?
No
Check the Dome sheet
Yes No
U474 pin 2,3 > 3.2V Check the circuit related to U474
Yes No
U619 pin 5 2.5 V ? Check the circuit related to U619
Yes No
U620 pin 5 3.0 V ? Check U620 and related circuit
Yes No
Check for the clock signal at R107
Check the clock generation circuit (related to U100 and Q100)
Yes
Check the initial operation
END
Flow Chart of Troubleshooting and Circuit Diagrams
5-1
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