Gsm Rf Tunings; Gsm Rx Tunings - Nokia NPM-2NX Troubleshooting Manual

NPM-2NX
Troubleshooting

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)
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CCS Technical Documentation
Issue 1 07/02