Nokia NHM–7 Series Troubleshooting Instructions page 16

NHM–7
Troubleshooting Instructions
Audio
faults 2
Is microphone working?
Yes
Audio
faults 3
Page 16
Try change bottom
No
connector X100.
Is it working now ?
No
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set HP IN, EXT OUT, LOOP ON.
Measure MICB1
voltage from MICP pads.
Is it ~2.1V ?
Yes
Check C151,
R157, C105,
C154 and line.
If OK –>
Change UEM
E Nokia Corporation
PAMS Technical Documentation
Yes
Retest
Check L105,
C105, C152,
C156, R152,
No
C168, C166,
C215 and line.
If OK –>
Change UEM
Issue 1 10/2001