User Guide

RAE-6/RA-4
Nokia Customer Care 6 - Baseband Description and Troubleshooting
54 COMPANY CONFIDENTIAL Issue 1 12/04
Copyright © 2004 Nokia. All Rights Reserved.
Microphone doesn't work
NO
Clean contacts/ replace
MIC module
(B2100).
Retest.
Check MIC module
(B2100) and PWB
contacts.
Are they OK?
Set Phoenix Audio
Routing from MIC1
(Hand portable) to known
working audio output
(EARP/ HP or Ext,
XEAR) Ensure MIC Bias
(MICB1) is set on.
Is MIC Bias 2.1V
present at R2102?
Check R2102, R2103,
C2104 and C2105.
Change components if
needed.
Retest.
Are audio signals
from MIC to UEME
OK?
Check audio path trough dual
resistor R2102
and dual capacitor C2102.
Check also R2103 and
dual ferrite L2101.
Change needed components.
Retest.
Does the audio work
in a call?
END
YES
NO
YES
NO
NO
YES
No MIC Bias.
MIC Bias OK
Audio signals OK
YES
No audio signal
Working
UEME D2200 FAULT?
Fault is in non-reworkable
component. Refer to
current BER handling
guidance.