Audio Faults; Earpiece - Nokia NPD-1 Series Troubleshooting - Bb

NPD-1
Troubleshooting — BB

Audio faults

Earpiece

Audio
faults
Is the earpiece
working?
Yes
Yes
Audio
faults 2
Page 34
No
Change earpiece.
Is it working now?
Set phone in LOCAL m ode.
Use phoenix "Baseband
Audio Control" and set the
following: Enable Tx,
Enable Rx, Select MIC2
(0dB), Enable earpiece
Inject a 1KHz sine signal
20m Vp-p on XMIC (pin 9/10
of the bottom e connector
Is the signal
com m ing out of the
UEM on EARP and
EARN?
Nokia Corporation
CCS Technical Documentation
Yes
No
only.
No
Yes
Confidential
Retest
Probe signal on
R162, R155, V152,
C154, C155, R152,
R150, C151, C153,
L120, R180. Check
the bias voltage on
one end of C193
(2.1V)
If OK change the
UEM.
Check R150, C180,
and C181.
If OK then change
earpiece.
Issue 1 11/2002