User Guide

CCS Technical Documentation
Company confidential RH-20
Issue 1 10/2003 Nokia Corporation. Page 51
Figure 16: Audio troubleshooting (3)
Audio faults
2
Try to change new
UI-module. Is it working
now ?
Measure MICB1-
voltage from MICP pad.
Is it ~2.1V ?
Restore old UI module. Set phone to
LOCAL mode. Using Phoenix
Audiotest set HP IN, EXT OUT,
LOOP ON
Check L101, C151,
C152, C153, R156,
R157.
If OK change UEM
Check mic contact springs
from old UI module.
If not OK replace
microphone in old UI
module with new one.
Retest.
No Yes
No
No
Audio faults
3
Check C151, R157,
C153 and line.
If OK change UEM if
still fail change UPP
Yes
Yes
Is microphone
working ?