Table of Contents
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Flow Chart of Troubleshooting
Mic Working
Operate MIC
Check UCD501 &
NG
Neighboring Circuits
NO
MIC+, MIC- pin in
NO
Check ZD506, ZD504 &
Check 28pin in UCD501
YES
MIC501
Change MIC
= High?
Signal ON?
YES
7,8 pin in
1, 11 pin in U503
NO
NO
Check UCD501 &
U503
Signal ON?
Neighboring Circuits
= Low?
YES
YES
Change U503
Check UCD501
& Neighboring Circuits
7-15
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