User Guide

Issue 2 10/2004 COMPANY CONFIDENTIAL 3
Copyright © 2004 Nokia. All Rights Reserved.
NHL-12
7 - RF Description & Troubleshooting Nokia Customer Care
RF Description and Troubleshooting................................................................ 4
RF key component placement ........................................................................... 4
RF measurement points..................................................................................... 5
Test points ....................................................................................................... 7
RF Implementation in NHL-12............................................................................ 8
RF frequency plan.............................................................................................. 8
RF power supply configuration ........................................................................ 10
Introduction to RF troubleshooting................................................................. 11
Receiver Description and Troubleshooting.................................................... 12
Receiver........................................................................................................... 12
Rx front-end ..................................................................................................... 12
General instructions for Rx troubleshooting..................................................... 14
Troubleshooting charts for receiver ................................................................. 15
Troubleshooting diagram for GSM850 receiver ............................................. 15
Troubleshooting diagram for GSM1900 receiver ........................................... 17
Transmitter Description and Troubleshooting............................................... 21
Transmitter characteristics............................................................................... 21
Power amplifier ................................................................................................ 21
RF ASIC Helgo ................................................................................................ 22
AFC function .................................................................................................... 22
General instructions for Tx troubleshooting ..................................................... 23
Transmitter troubleshooting diagram ............................................................. 24
Pictures of transmitter signals ........................................................................ 27
Additional Information on EDGE Troubleshooting........................................ 30
Pictures of EDGE transmitter signals ............................................................. 34
Synthesizer Description and Troubleshooting .............................................. 37
Frequency synthesizers ................................................................................... 37
General instructions for synthesizer troubleshooting ....................................... 40
Troubleshooting chart for PLL synthesizer .................................................... 41
Frequency lists................................................................................................. 43