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