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Flow Chart of Troubleshooting
7-14
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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 EAR500, U508 &
Neighboring Circuits
NO
YES
10pin in U416
= High?
NO
YES
1pin in U508
= High?
2pin in U416
= High?
Change
PBA
Change
U416
YES
NO
NO
YES
NO
Change U507
Check U508 &
Neighboring Circuits
YES
7pin in U508
= High?
Check EAR500 &
Neighboring Circuits
MIC
NG?
NO
NO
Check EAR500 &
Neighboring Circuits
YES
6pin in U507
Signal ON?
YES
NO
YES
5pin in U507
Signal ON?
Check U501, U508
& Neighboring Circuits
SPK
NG?
NO
YES
39,41pin
in UDC500
Signal ON?
YES
YES
10pin in U501
Signal ON?
Check U508 &
Neighboring Circuits
Check UDC500, U501
& Neighboring Circuits