User Guide

CCS Technical Documentation Troubleshooting Instructions
Issue 1 01/03 ãNokia Corporation. Page 35
Audio faults
2
Is microphone
working ?
Try to change new
C-cover assembly. Is it
working now ?
Measure MICB1-
voltage from J110 pad.
Is it ~1.38V ?
Restore old C-cover. Set phone to
LOCAL mode. Using Phoenix
Audiotest set HP IN, EXT OUT,
LOOP ON
Check L101,L108, C151,
C152, C153, R156,
R157, R176.
If OK change UEM
Check mic contact springs
from old C-Cover assembly.
If not OK change PopPort
assembly to old C-cover.
Retest.
No
Yes
No
No
Audio faults
3
Check C151, R157,
C105,C154 and line.
If OK change UEM if still
fail change UPP
Yes
Yes