User Guide

CCS Technical Documentation
Company confidential RH-23
Issue 1 03/2004 Nokia Corporation. Page 49
Figure 42: Audio (earpiece 2) failure troubleshooting
Earpiece
2
No
Yes
Retest
Connect EXT audio signal 1kHz
(sine, 200mVpp) between XMICP
and XMICN pads using CA-6UT
cable
Check components
L102, C115, C116,
R158,R159, C159,
R154, R155, C172,
C173. Check also
lines.OK?
Change UPP
Measure sine signal between
module jigs “hinge” EarN (pin11)
and EarP(pin12).
Is it 160mVpp?
(80mVpp measured to GND.
DC_offset ~1.35V)
Measure resistances from
Pop-Port’s XMICP to C172
and
Pop-Port’s XMICP to C173.
A
re they ~2k2?
Measure resistance from
Pop-Port XMICN to C173
and
Pop-Port XMICP to C172
A
re they ~1k0?
Yes
No
No
No
Change/fix
defect part
NoYes