Nokia 5140 Manuales De Servicio

NPL-4/5

Company confidential 

Troubleshooting Instructions

Nokia Customer Care

Page 38

Copyright © 2004 Nokia Corporation. All rights reserved.

Issue 1 05/04

Ensure that the GMSK is 

Start the preparations as described in chapter 

Check Synthesizer Operation.

Set the operating mode to “local mode”.

Select->Testing->RF Controls

Wait until the RF Controls window is popped up

Select->Band->GSM 1800

-Active unit->TX

-Operation mode->Burst

-RX/TX Channel->700

-TX Power Level->5

Use Phoenix to select 

 

 

 

 

TX_Data Type: "1" or "0" 

 

 

 

 

TX Power Level: 10 

Ch37 

Ensure Vbatt=3.9 V 

 

 

 

 

Yes  

 

 

   

Oscilloscope  

 

   

R705 

IREF01 

 

Vdc >    0.5 Volt 

 

Check 

R702 

Mode 

Vdc =    2.78 Volt 

No 

Base Band 

BOM1 VPCTRL_900 

R703 

Vdc= 0 V 

 

 

BOM2 VPCTRL_900 

R703 

Vdc= 2.7 V 

 

 

 

 

 

 

 

Yes  

 

 

   

 

 

 

 

 

 

Spectrum analyzer 

 

Check PA N700 

 

 

RF-connector 

No 

Check Power Loop 

 

 

Pout                   

=  +24 dBm, 897.4MHz 

 

 

 

 

Yes  

 

 

   

GSM900 TX 

 

 

 

 

OK