Nokia 3110 TUNING INSTRUCTIONS

Programmes After Market Services

NHE–8/9 TUNING

INSTRUCTIONS

issue 3 12/98

NHE–8/9

PAMS

Tuning Instructions

Technical Documentation

Contents

Introduction Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Required Equipment Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Setup for Tuning a Phone without Removing Covers Page 5. . . . .

Equipment Setup for Tuning a Phone with Covers Removed Page 6. . . . . . . .

Starting The Software Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tuning Steps Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. RSSI Reference Signal Level Storage Page 7. . . . . . . . . . . . . . . . . . . . . . . . .

2. AFC Diagram Storage Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. I/Q Modulator Amplitude Balance and Phase Shift Tuning Page 8. . . . . . . .

4. Tuning of Transmitter Power Levels Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Charge Voltage Adjustment Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Battery Voltage Adjustment Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. LCD Calibration Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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issue 3 12/98

PAMS

NHE–8/9

Technical Documentation

Introduction

General

In contrast to earlier second–generation analog cellular phones almost all tuning
operations of the NHE–8/9 are carried out using the service software. The service
software turns the phone into the locals mode, in which the phone can be outwardly
controlled via the M2BUS interface.

Tuning is based on the software communicating with the D/A and A/D converters
of the phone. In some instances the phone processor will also calculate the
required correction parameter.

The tuning values of the phone reside on the EEPROM. The contents of the
EEPROM can be read by the service software and saved as a file. This is advisable
when there is need to retain that information, e.g. in view of replacement of the
circuit. The program also enables writing the default parameters on the EEPROM,
in which case all tuning steps should be carried out.

Tuning Instructions

N.B. During tuning, proceed as follows:

– Take care not to damage sensitive measuring instruments with excessive

RF power.

– Carry out all tuning steps in the shortest possible time to avoid excessive

heating of RF units.
– Perform all tuning steps in the order presented.
– Never try to mask a fault by tuning it out!

Required Equipment

– PC/AT computer with service software; see separate section for instructions

on installation and use.
– M2BUS adapter DAU–4S and other service accessories; see equipment set-

up pictures.
– Multimeter or DVM.
– GSM radio telephone test station or separate measuring equipment as fol-

lows:

– RF generator

issue 3 12/98

– pulse power meter
– spectrum analyzer
– attenuator and branching unit

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