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Hands-Free Stereo Headset Working
Hands-Free
Stereo Headset
SPK , MIC
YES
& Button
All NG?
NO
Button
YES
NG?
NO
MIC
YES
NG?
NO
SPK
YES
NG?
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28pin in UCD501
= High?
YES
Check EAR501 &
Neighboring Circuits
9pin in EAR501
= High?
NO
Check Ear501 &
Neighboring Circuits
2,3pin in
EAR501
Signal ON?
YES
1,11pin in
U503
Signal ON?
YES
Check UCD501, U503
& Neighboring Circuits
39,41pin
YES
in UCD501
Signal ON?
NO
7-17
NO
Change
PBA
YES
Change PBA
NO
Check Ear501 &
Neighboring Circuits
7,8pin in
NO
U503
= High?
YES
Check UCD501 &
Neighboring Circuits
15pin in U502
Signal ON?
NO
Check U502, UCD501
& Neighboring Circuits
Flow Chart of Troubleshooting
NO
Change
UCD501
YES
Check Ear501 &
Neighboring Circuits
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