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Flow Chart of Troubleshooting and Circuit Diagrams
3-6
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3-1-2. System Initial
Initial Failure
Check the pin#9 of U501
Voltage level is high?
LCD display OK ?
END
Check U501
Check the Sleep X-tal
signal at C515
YES
Check the clock signal
at R503
YES
YES
YES
YES
Sound operation OK ?
NO
Change OSC500
NO
Check the clock generation part related to
U501 and TCXO100
NO
Check the LCD part
NO
Check the AUDIO part
NO