Nokia RM-12 Troubleshooting Instructions page 56

CCS Technical Documentation
Headset Microphone
External MIC does n't work
START
C heck sy stem
connector and PW B
contacts.
Are they OK?
YES
C onnect a working
Pop-Port headset to
the sy stem connector
Set Phoenix Audio
R outing f rom MIC 2
(H d MIC ) to a working
audio output (H pEar or
XEar). Ensure MIC
Bias (MIC B2) is set
on.
YES
Is MIC Bias 2.1V
present at R 2130?
YES
Are audio signals
from system
connector to U EM
OK?
YES
D oes the audio work
during a call?
YES
EN D
54
C lean contacts
NO
and replace
system
connector
(X2021)
C heck R 2005, R 2122,
R 2123, R 2130, C 2022,
NO
C 2012, C 2013, C 2128,
C 2129 and C 2137.
C hange com ponents if
needed.
C heck audio path through
L2003, R 2005, R 2125,
C 2022, C 2013, C 2012,
NO
C 2124. C heck also H ookint
route trough R 2121 and
C 2120. C hange needed
com ponents.
NO
C hange U PP
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
NO
Is MIC Bias 2.1V
present at R 2130?
YES
Are audio signals
NO
from system
connector to U EM
OK?
YES
Issue 1 11/2004
RM-12
C hange U EM
C hange U EM