Audio Faults - Nokia RH-3 Series Troubleshooting - Bb

RH-3
Troubleshooting — BB

Audio faults

Audio
faults
Is the earpiece
working?
Yes
Yes
Audio
faults 2
Page 32
No
Change earpiece.
Is it working now?
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 loop back
only.
Inject a 1KHz sine signal
20mVp-p on XMIC (pin9/10 of
the bottom connector
Is the signal coming
out of the UEM on
EARP and EARN?
Nokia Corporation
CCS Technical Documentation
Yes
No
Probe signal on
R162, R155, V152,
C154, C155, R152,
No
R150, C151, C153,
L120, R180. Check
the bias voltage on
one end of C193
(2.1V). If OK,
change UEM
Yes
Check R150, C180,
If OK, then change
Confidential
Retest
and C181.
earpiece.
Issue 1 06/2003