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Flow Chart of Troubleshooting
7-13
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Mic Working
Operate MIC
NG
Check D501 &
Change MIC
NO
YES
Check UDC500
& Neighboring Circuits
4pin in U507
Signal ON?
Check U508 &
Neighboring Circuits
NO
YES
5pin in U507
Signal ON?
NO
YES
1pin in U507
= Low?
Change U507
NO
YES
3pin in U501
Signal ON?
NO
YES
4pin in U501
= High?
Change U501