Microphone Does Not Work - Nokia RM-4 Troubleshooting Instructions

CCS Technical Documentation

Microphone does not work

Microphone do not work and
16
it's not a mechanical
problem
Z100
Check Z100 is
working correctly
(no short/open-circuit)
C101,C102 & C103
Check for short-circuit.
Error still present
R165
Check voltage level on
R165 towards UEM (bias)
= 2,1V
Yes
R153
Check voltage level on
R153 towards mic-lines (bias)
= 1,0V - 1,4V
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
Troubleshooting Instructions
Replace :
No
Z100
Replace :
No
C101, C102, C103
Check :
No
R165, C168, PWB.
Else defctive D200*
Check :
R152, R153, R155, R157,
No
R164, C151, C152, C153,
C154, PWB.
RM-4/RM-5
ISSUE 1 02/2004