User Guide

RH-23 Company confidential
CCS Technical Documentation
Page 50 Nokia Corporation. Issue 1 03/2004
Audio fault (microphone)
Figure 43: Audio (microphone) failure troubleshooting
Audio
faults 2
No
Check microphone
contact springs from old
microphone. If not OK,
replace B-cover lower
with new microphone in
it. Retest
Yes
No
Restore old microphone back. Set phone to
LOCAL mode. Using Phoenix Audiotest select:
“Hp microphone in Ext speaker out”
and set Loop “On”
Check L101, R156,
R171, C152, R157,
C151, C156, C153.
OK?
No
Yes
Check R157, C156, C151, C153
and line. OK?
Audio
faults 3
Yes
Figure 17: Audio (microphone) failure troubleshooting
Is Microphone working?
Try to change
microphone. Is it
working now??
Measure MICB1-biasing voltage
from module jigs mic-pogo-pin
(connects to the center terminal
of microphone pad) Is it ~1.6V?
Change UEM. OK?
Change UPP
Change/fix
defect part
Yes
No
No
Change/fix
defect part
No
Yes