Flow Chart of Troubleshooting and Circuit Diagrams
9-1-2. System Initial
The pin #9 of U503
" Low --> High" ?
Check the Sleep X-tal signal's
Check the clock signal's
LCD Display OK ?
Sound operation OK ?
Initial Failure
YES
at C525
YES
at R512
YES
YES
YES
END
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NO
NO
Check the clock generation
NO
circuit (related to U503 and
NO
NO
9-4
Check the U503
Check the OSC501
TCX800)
Check the LCD part
Check the Audio part