User Guide

RH-20 Company confidential
CCS Technical Documentation
Page 50 Nokia Corporation. Issue 1 10/2003
Figure 15: Audio troubleshooting (2)
Earpiece
2
Measure sine
signal from earpiece
pads (J310,J311).
Is It ~880mVpp ?
Connect EXT audio
signal 1kHz (sine,
200mVpp) between
XMICP and XMICN
pads (X101, 9/10)
Measure sine
signal to UEM (R155).
Is it ~130mVpp ?
Check C154. If OK
change UEM
Check C154, R155,
C156, R154, C159,
R158, R159 and lines.
Change UPP
Retest
No
Yes
Yes
No