Audio Faults; Earpiece - Nokia RH-44 Series Troubleshooting - Bb

RH-44
Troubleshooting — BB

Audio faults

Earpiece

Audio faults
Is earpiece working?
Yes
Audio faults 2
Page 32
Change earpiece. Is it
No
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 only. Inject 1KHz
sine signal 20mVp-p on XMIC (pin
9/10 of bottom connector).
Is signal coming out of
UEM on EARP and
EARN?
Nokia Corporation
CCS Technical Documentation
Yes
No
No
Yes
Confidential
Re-test
Probe signal on R162,
R155, V152, C154,
C155, R152, R150,
C151, C153, L120,
R180. Check 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 04/2003