User Guide

CCS Technical Documentation
Company confidential RH-20
Issue 1 10/2003 Nokia Corporation. Page 49
Audio Fault
Figure 14: Audio troubleshooting (1)
Audio faults
Is earpiece
working ?
Try to change
UI- module. Is it working
now ?
Measure DC-
offset voltage between earpiece
pads J310/J311 and GND. Is it
~1.38V ?
Measure
MICB2 voltage from
XMICP (L102 input).
Is it ~2.1V ?
Change old UI -module back.Set
phone to LOCAL mode. Using
Phoenix Audiotest set EXT IN, HP
OUT, LOOP ON
Check L150, C155,
R151, R152 and line.
If OK change UEM
Check L102, C116,
C150, R153, C159,
R158 and line.
If OK change UEM.
Check earpiece
contact springs from
old UI-module and
change earpiece and
foam to old UI-
module.
Retest.
Audio faults
2
Earpiece
2
No Yes
No
No
No
Yes
Yes
Yes