User Guide

TUNING INSTRUCTIONS
9618ARo
6–3–1
NHC–4
Technical Documentation
Copyright  Nokia Mobile Phones
Contents
Tuning Instructions 6–3–2
General 6–3–2
Required Equipment 6–3–3
Accuracy of the Equipment During Measurement 6–3–3
Equipment Setup 6–3–4
Equipment Setup for Tuning a Phone without Removing Covers 6–3–5
Equipment Setup for Tuning a Phone Removing Covers 6–3–6
Equipment Setup For Tuning A Booster 6–3–7
Starting The Program 6–3–8
Starting options for service software 6–3–8
Tuning Steps of Radio Unit 6–3–9
1. Bias Current Tuning 6–3–9
2. TX Output Power 6–3–10
3. FM Modulator Tuning 6–3–11
4. AFC tuning 6–3–12
5. RFI TX–IQ D.C. Offset Tuning 6–3–13
6. AMPS Demodulation Tuning 6–3–14
7. Analog mode RSSI 6–3–15
8. Digital mode AGC 6–3–16
9. Battery Voltage Adjustment 6–3–17
10. Charge Voltage Adjustment 6–3–17
11. SINAD Level Checking 6–3–18
Tuning Steps of Booster 6–3–19
1. Output Power Tuning 6–3–19
2. Transmitter Frequency Tuning 6–3–20
3. Output Power Check 6–3–21
4. Receiver Calibration 6–3–22
5. Voltage Calibration 6–3–22