PAMS Technical Documentation
Troubleshooting and Tuning Instructions
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Audio fault 1
Audio
faults
Is earpiece working?
Try change earpiece.
Is it working now ?
No
Retest
Yes
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set EXT IN, HP OUT, LOOP ON.
No
Measure DC
offset voltage
from Earpiece pads.
Is it ~1.38V ?
Check L151, C160,
R164 and line.
If OK
–> Change UEM
No
Audio
faults 2
Yes
Measure MICB2
voltage from XMICP pads
(L106) .
Is it ~2.2V ?
Yes
Check L106, C112,
R161, C163, R166,
C165, R167 and
line.
If OK
–> Change UEM
No
Earpiece
2
Yes