User Guide

NPM-2NX
Troubleshooting CCS Technical Documentation
Page 64 ãNokia Corporation Issue 1 07/02
GSM RF tunings
GSM RX tunings
LP and AMP2 filters tunings
• This is done using Safari internal loop. No external signal is needed
If it fails there can be following problems:
• Safari problem
GSM AFC tuning
• Purpose of the tuning is to correct phone frequency error
If AFC tuníng fails it might be due to:
• Problems with upper band signal path (synthesizer etc.)
• VCTCXO component can be broken
•(UEM)
• (UPP)