User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Troubleshooting - Baseband Nokia Customer Care
Page 38 ©2004 Nokia Corporation Company Confidential Issue 1 - Revision 002 09/2004
Microphone
Audio
faults,
page 2
Audio
faults,
page 3
Is the
microphone
working?
Change the
microphone. Is it
working now?
Retest
Set phone 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?
Is the signal going
to the UEM at MIC1P
and MIC1N at C150?
Is the signal going
out of the UEM at
XEARP, pin 12 on
the bottom
connector?
Check C170, C172,
and C151. If OK,
change UEM.
Check audio
ASIPs Z150, Z151,
R150, then change
the microphone.
Check R160, R162,
R153, and R163. If
OK, change the
UEM.
Retest
NO YES
NO
YES
NO
YES
NO
YES
NO
YES