Nokia NHL-10 Baseband Troubleshooting And Manual Tuning Manual page 30

CCS Technical Documentation
START
Connect a know n w orking 4
terminal DCT4 headset to the
system connector.
Check system connector and PWB
contacts. Are they OK?
Yes
Set Phoenix Audio Routing from
a know n w orking MIC input,
MIC1 [HP, int] or MIC2 [Ext,
XMIC] to HF/HFCM. Ensure the
correct MIC Bias is ON.
Is the HF DC Bias
voltage seen on the HF
& HFCM lines at the
system connector?
Yes
Are the audio signals
from UEM to the system
connector OK?
Yes
Does audio w ork in a
call?
Yes
END
30
Figure 23: External Earpiece troubleshooting
No
Clean contacts / replace system
connector, X381.
Check audio path through R342,
Z330, Z331 and associated
No
passives. Check for shorts / low
impedance to GND & opens in
series components. Change
passives w here necessary.
Check audio path through R342,
Z330, Z331 and associated
No
passives. Check for shorts / low
impedance to GND & opens in
series components. Change
passives w here necessary.
No Change UPP_
WD2
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
Baseband Troubleshooting
Audio Troubleshooting
External Earpiece
Is the HF DC Bias
voltage seen on the HF
No
& HFCM lines at the
system connector?
Yes
No
Are the audio signals
from UEM to the system
connector OK?
Yes
NHL-10
Change UEM
Change UEM
ISSUE 2 01/2004