User Guide

PAMS Technical Documentation UI Module Troubleshooting
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Phone Audio
Malfunction
(Stereo Headset)
Is MP3
functioning
OK?
Go to MP3
Troubleshooting
section.
NO
Make a phone call.
Ensure the line is
connected.
Check if
there is voice signal
appear at XEARP and
XEARN at B2B
connector
Check if
there is voice
signal appears at pin 15
and pin 2 of
U602
Check C614 and
R603
NO
NO
YES
YES
Check if
there is voice
signal appears at pin 13
and pin 3 of
U602
Change U602
Check C616, C617
NO
YES
Check the soldering
and connection of the
36-pin B2B connector
to UI board