Microphone - Nokia 6255 Description And Troubleshooting

Nokia Customer Care

Microphone

Audio
faults,
page 2
Is the
microphone
working?
YES
Audio
faults,
page 3
Issue 2 05/2005
Change the
NO
microphone. Is it
working now?
NO
Set mobile terminal in Local
Mode. Use Phoenix
Troubleshooting > Phone
Control > Aphone State Tab >
select Local Mode > click
Execute. Then use Audio test >
HP microphone in/HP speaker
out > Loop ON to enable the
earpiece. Talk through the
microphone.
Measure MICB1
voltage from MICP
pads on bottom
connector.
Is it ~2.1V?
YES
Is the signal going
to the UEM at MIC1P
and MIC1N at C2113
and C2114?
YES
Is the signal going
out of the UEM at
HSEARP, pin 12 on
the bottom
connector?
YES
Retest
©2005 Nokia Corporation
6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting
YES
Retest
Check C2115. If
NO
OK, change UEM.
Check audio
ASIPs Z2105,
Z2106, C2113 and
NO
C2114, then
change the
microphone.
Check R106. If OK,
NO
change the UEM.
Company Confidential Page 57