NHL-10
Baseband Troubleshooting
CCS Technical Documentation
ISSUE 2 01/2004
COMPANY CONFIDENTIAL
29
Copyright © 2003 Nokia. All Rights Reserved.
Earpiece
Check that holes are not coated.
Figure 22: Internal Earpiece troubleshooting
START
Check Earpiece and PWB contacts.
Are they OK?
Clean contacts /
replace the earpiece
(B341) & gasket.
Set Phone Audio Routing from a
know n w orking MIC input, MIC1
[HP, int] or MIC2 [Ext, XMIC] to
EARP/N. Ensure the correct MIC
Bias is ON.
Is the EAR DC Bias
voltage seen on the
EARP & N paths or at
the earpiece pads?
Change UEM
Are the audio signals
from UEM to the
earpiece pads OK?
Change UEM
Does audio w ork in a
call?
Change UPP_ WD2
END
No
Ye s
No
Ye s
No
Ye s
No
No
No
Ye s
Ye s
Ye s
Check audio path from UEM to
the earpiece pads. Check for
shorts / low impedance to
GND or betw een the lines.
Change passives w here
necessary.
Is the EAR DC Bias
voltage seen on the
EARP & N paths or at
the earpiece pads?
Check audio path from UEM to
the earpiece pads. Check for
shorts / low impedance to
GND or betw een the lines.
Change passives w here
necessary.
Are the audio signals
from UEM to the
earpiece pads OK?
Audio Troubleshooting
Internal Earpiece
