User Guide

Nokia Customer Care 6(a) - Baseband Troubleshooting
Company Confidential RH-51/52, RH-67/68
Issue 3 09/2004 © 2004 Nokia Corporation. Page 33
Internal earpiece
Check that holes are not coated.
Figure 26: Internal earpiece troubleshooting
Internal
earpiece faulty
Set phone audio routing from a
known working MIC input to
EAR N/P. Ensure the correct
MIC bias is on.
Check earpiece
and PWB contacts.
Are they ok?
Clean contacts /
replace earpiece &
gasket
no
Check audio path from UEME
to the earpiece pads. Check
for shorts to GND or between
the lines. Change passives
where necessary.
Passive
components ok? (correct
value/ no short circuit to
GND)
Change UEME
Are the
audio signals from
UEME to earpiece
ok?
Check audio path from UEME
to the earpiece pads. Check
for shorts to GND or between
the lines. Change passives
where necessary.
Passive
components ok?
(correct value/ no short
circuit to GND)
Change UEME
Does
audio work in
a call?
Change
UPP_WD2
End
yes
yes
yes
no
no
no
yes
yes
Is the EAR
DC bias voltage seen on
the EAR P/N paths or at
the earpiece pads?
Change
defect parts
Change
defect parts
no
yes
no