Introduction; Notes On Reference Measurements - Nokia RM-14 Rf Troubleshooting And Manual Tuning

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RM-14

RF Troubleshooting and Manual Tuning

Introduction

This document is the troubleshooting guide for RM-14. On the following pages you will find a

step-by-step fault finding procedure and reference measurements at the relevant signal points.

Note! Most test points are not accessible unless shielding cans are cut open.

This must ONLY be done by the Return Analysis technicians and for analysis

only!

■

•

LF & DC signals are measured with Textronix 100 MHz Scope (TDS3014) and

P3010 13pF probe.

• RF signals are measured with R&S FSIQ 7GHz Spectrum Analyzer and Agilent

resistive divider probe (10dB, 500ohm).

• Please be aware that the RF connector on service adaptor is leaking power (into

air) and acts as noise source when probing on RX chain. In 1800 band the problem

is most severe while there is no external LNA to amplify the signal above the noise

level like in the 1900 band. In 900 band the leakage is not as high due to lower fre-

quency.

• GSM SA settings: RBW=500kHz, VBW=500kHz.

• Bluetooth SA settings: RBW=2MHz, VBW=2MHz.

• All reference measurements were made on a RM-14 phone (GSM900).

• RF loss Module Repair Jig: 900: 0.6 dB, 1800: 1.1dB and 1900: 1.2dB. Bluetooth

is 1.8dB.

ISSUE 1 11/04

COMPANY CONFIDENTIAL

Nokia Customer Care

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