Nokia 6230 Service Manual 06(b) rh12 rf trouble

CCS Technical Documentation

RH-12/RH-28 Series Transceivers

6(b) - RF Troubleshooting

Instructions

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RH-12/RH-28

RF Troubleshooting Instructions CCS Technical Documentation

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RH-12/RH-28

CCS Technical Documentation RF Troubleshooting Instructions

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 850/900 GMSK troubleshooting ..........................................................................10

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

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

Rx 850/900 troubleshooting ......................................................................................13

Rx 1800 troubleshooting ............................................................................................14

Rx 1900 troubleshooting ............................................................................................15

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

Bluetooth troubleshooting .........................................................................................17

FM radio troubleshooting ..........................................................................................18

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RH-12/RH-28

RF Troubleshooting Instructions CCS Technical Documentation

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RH-12/RH-28

CCS Technical Documentation RF Troubleshooting Instructions

Introduction

This document is the troubleshooting guide for RH-12/RH-28. On the following pages you will find a step-by-step fault finding procedure and reference measurements at the relevant signal points.

Notes on reference measurements

• 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/ 850 band the leakage is not as high due to lower frequency.

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

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

• All reference measurements were made on a RH-12 phone (GSM900). RH-28 (GSM850) results should be very similar.

• RF loss Module Repair Jig: 0.3dB (low bands), 0.4dB (high bands).

• RF loss RF Adaptor: 0.4dB (low band), 0.7dB (high bands).

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RH-12/RH-28

RF Troubleshooting Instructions CCS Technical Documentation

Helgo / Synthesizer Troubleshooting

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