Nokia 5140 Manuales De Servicio
NPL-4/5
Company confidential
Troubleshooting Instructions
Nokia Customer Care
Page 72
Copyright © 2004 Nokia Corporation. All rights reserved.
Issue 1 05/04
Audio fault1
Audio faults
Is earpiece
working ?
Try to change UI-
module. Is it working
now ?
Measure DC-
voltage levels from speaker pads.
Is it ~1.36V ?
Measure
MICB2 voltage from
XMIC (L102 input).
Is it ~2.2V ?
Change old UI -module back. Use
Phoenix audio test.
Set EXT IN, HP OUT, LOOP ON
Check L150, C155,
R151, R152 and
lines.
If OK change UEMEk.
Retest
Check L102, C116,
C150, R153, R154,
C150, R153, R154,
R172 and lines.
If OK change UEMEk.
Check earpiece
contact springs from
old UI-module and
change earpiece to
old UI-module.
Retest.
Audio faults
2
No
Yes
No
No
No
Yes
Yes
Connect EXT audio signal (1kHz sine,
200mVpp) between XMICP and XMICN
Measure sine signal from
earpiece pads. Is it
~800mVpp?
Measure sine
signal from R155
(UEMEk). Is it
~130mVpp?
Yes
No
Change
UEMEk
Yes
Check C154,
C156, R155,
R154 and lines
No
Change UPP and
retest
Yes