Audio Fault - Nokia NHM–7 Series Troubleshooting Instructions

NHM–7
Troubleshooting Instructions

Audio fault

Audio
faults
Is earpiece working?
Yes
Audio
faults 2
Page 14
No
Try change earpiece.
Is it working now ?
No
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set EXT IN, HP OUT, LOOP ON.
Measure DC
offset voltage
from Earpiece pads.
Is it ~1.38V ?
Yes
Measure MICB2
voltage from XMICP pads
(L106) .
Is it ~2.2V ?
Yes
Earpiece
2
E Nokia Corporation
PAMS Technical Documentation
Yes
Retest
Check L151, C160,
No
R164 and line.
If OK
–> Change UEM
Check L106, C112,
R161, C163, R166,
No
C165, R167 and
line.
If OK
–> Change UEM
Issue 1 10/2001