Nokia 6020b Instruction De Maintenance
Issue 1 03/2005
COMPANY CONFIDENTIAL
17
Copyright © 2005 Nokia. All Rights Reserved.
RM-31
6(a) - Baseband Troubleshooting Instructions
6(a) - Baseband Troubleshooting Instructions
Nokia Customer Care
■
Audio faults 1
Measure
DC offset
DC offset
voltagefrom Earpiece
pads. is it ~1.38V
to GND?
Set phone in LOCAL
mode.
Use Phoenix Audio
Test.
Set EXT IN, HP OUT,
LOOP ON
Measure
MICB2voltage
from XMICP
pads. Is it ~2.2V
Yes
No
Yes
Yes
Yes
No
No
No
Audio
faults
Is HP
earpiece
working?
Audio
faults 2
Earpiece
Audio
faults3
Check L2150,
R2151, C2179
and line.
If OK change
UEM.
Retest
Try
changing earpiece.
Is it working
now?