Nokia 6020b Service Manual

 RM-31

Nokia Customer Care                                6(a) - Baseband Troubleshooting Instructions

16

COMPANY CONFIDENTIAL

Issue 1 03/2005

Copyright © 2005 Nokia. All Rights Reserved.

■ 

SIM

card

Insert

SIM card

faults?

Does phone enter

 LOCAL MODE.

OK?

  Measure

VSIM voltage

from X2700.

Is it 3V or 

1.8V?

Check SIM

power Up sequence.

 Is it OK?

Check BSI line, 

X2000, C2004, 
R2270, C2270, 

R2273.

If OK change UEM.

Check VSIM line, 

X2700, C2703, 

C2219.

If ok change R2700.

If still wrong VSIM 

voltage change UEM

Check SIM lines. 

If OK change R2700.

If still fail change 

UEM.

Change UPP

Retest

Yes

No

Yes

No

Yes

Yes

No

No