Audio Fault1 - Nokia NPL-4 Series Troubleshooting Instructions

NPL-4/5/RM-104
Troubleshooting Instructions

Audio fault1

Audio faults
Is earpiece
working ?
Yes
Audio faults
2
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Try to change UI-
No module. Is it working
now ?
No
Change old UI -module back. Use
Phoenix audio test.
Set EXT IN, HP OUT, LOOP ON
Measure DC-
voltage levels from speaker pads.
Is it ~1.36V ?
Yes
Measure
MICB2 voltage from
XMIC (L102 input).
Is it ~2.2V ?
Yes
Connect EXT audio signal (1kHz sine,
200mVpp) between XMICP and XMICN
Measure sine signal from
earpiece pads. Is it
~800mVpp?
Yes
Change UPP and
retest
Nokia Customer Care
Check earpiece
contact springs from
old UI-module and
Yes
change earpiece to
old UI-module.
Check L150, C155,
R151, R152 and
No
If OK change UEMEk.
Check L102, C116,
C150, R153, R154,
No
R172 and lines.
If OK change UEMEk.
Measure sine
signal from R155
No
Yes
(UEMEk). Is it
~130mVpp?
No
Check C154,
C156, R155,
R154 and lines
Retest.
lines.
Retest
Change
UEMEk
Issue 2 05/05