Nokia 6020b Service Manual

Issue 1 03/2005

COMPANY CONFIDENTIAL

17

Copyright © 2005 Nokia. All Rights Reserved.

RM-31
6(a) - Baseband Troubleshooting Instructions

Nokia Customer Care

■ 

Measure 
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?