User Guide

RH-51/52, RH-67/68 Company Confidential
6(a) - Baseband Troubleshooting Nokia Customer Care
Page 34 © 2004 Nokia Corporation. Issue 3 09/2004
External earpiece
Figure 27: External earpiece troubleshooting
External
earpiece faulty
Set phone audio routing from a
known working MIC input to
HF/HFCM. Ensure that correct
MIC bias is on.
Check
mechanical appearance and
solderings of system connector.
Is it ok?
Replace system
connector X132
no
Check audio path through
L618, L619, R634 and
associated passives. Check for
shorts to GND and open
inseries components.
Passive
components ok? (correct
value/ no short circuit to
GND)
Change UEME
Change
defect parts
Change UEME
Change
defect parts
Does
audio work in
a call?
Change
UPP_WD2
End
yes
yes
yes
no
no
no
yes
no
no
yes
yes
Connect headset HDB-4
to system connector
Check audio path through
L618, L619, R634 and
associated passives. Check for
shorts to GND and open
inseries components.
Passive
components ok? (correct
value/ no short circuit to
GND)
Are the
audio signals from
UEME to the X132
ok?
Is the
HF DC bias voltage
seen on the HF & HFCM
lines at X132?