Nokia 7280 서비스 매뉴얼

Nokia

ISSUE 1 11/04

COMPANY CONFIDENTIAL

3

Copyright © 2004 Nokia. All Rights Reserved.

RM-14

RF Troubleshooting and Manual Tuning

Nokia Customer Care

Table of Contents

Page No

Introduction ......................................................................................................... 5

Notes on reference measurements.................................................................... 5

Helgo / Synthesizer Troubleshooting................................................................ 6

N500 Helgo troubleshooting .............................................................................. 7
Synthesizer troubleshooting............................................................................... 8

Tx Troubleshooting............................................................................................. 9

Tx 900 GMSK troubleshooting ......................................................................... 10
Tx 1800/1900 GMSK troubleshooting .............................................................. 11

Rx Troubleshooting .......................................................................................... 12

Rx 900 troubleshooting ....................................................................................  13
Rx 1800 troubleshooting ..................................................................................  14
Rx 1900 troubleshooting ..................................................................................  15

Bluetooth / FM Radio Troubleshooting ........................................................... 16

Bluetooth troubleshooting ................................................................................ 17
FM radio troubleshooting ................................................................................. 18

Service Tool Concept for RF Tunings ............................................................. 19

Service concept for RM-14 RF tunings ............................................................ 20

Receiver Tunings............................................................................................... 21

RX channel select filter calibration ................................................................... 21
RX calibration................................................................................................... 22

EGSM900 band ............................................................................................. 22
GSM1800 band .............................................................................................. 24
GSM1900 band .............................................................................................. 25

RX band filter response compensation ............................................................ 26

EGSM900 band ............................................................................................. 27
GSM1800 band .............................................................................................. 30
GSM1900 band .............................................................................................. 31

Transmitter Tunings .......................................................................................... 33

TX power level tuning ...................................................................................... 33

EGSM900 PA High Mode with EDGE off  ....................................................... 34
EGSM900 PA high mode with EDGE on  ....................................................... 35
GSM1800 PA high mode with EDGE off  ........................................................ 36
GSM1800 PA high mode with EDGE on ........................................................ 37
GSM1900 PA high mode with EDGE off  ........................................................ 38
GSM1900 PA high mode with EDGE on ........................................................ 39

TX I/Q tuning .................................................................................................... 40