Nokia NPM-6 Series Troubleshooting Instructions page 35

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