Nokia 3105 Servicehandbuch
CCS Technical Documentation
Troubleshooting — BB
RH-48
Issue 1 11/2003
© 2003 Nokia Corporation Confidential
Page 41
Audio faults
Audio
faults
Audio
faults,
page 2
Is the earpiece
working?
Change earpiece. Is
it working now?
Retest
Set phone in Local Mode. Use
Phoenix "Baseband Audio
Control" and set the following:
Enable Tx, Enable Rx, Select
MIC2 (0dB), Enable earpiece
and enable digital loopback
only. Inject a 1KHz sine signal
20mVp-p on XMIC.
Is the signal coming
out of the UEM on
EARP and EARN?
Check L102, R150, R152,
R155, R151, C181, C153,
C151, C154, C152, C156.
C151, C154, C152, C156.
If OK, change UEM.
Check R177, R178. If
OK, then change
earpiece
NO
YES
NO
NO
YES
YES