Nokia 6260 RM-25, Руководство по обслуживанию

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Table of Contents
Introduction to RF troubleshooting ......................................................................................................................................... 7–5
RF key component placement .................................................................................................................................................... 7–5
Receiver ............................................................................................................................................................................................. 7–8
Receiver troubleshooting ...................................................................................................................................................... 7–8
Measuring Rx/IQ signals using RSSI .................................................................................................................................... 7–9
Measuring RX performance using SNR measurement ............................................................................................... 7–10
Measuring Rx module manually using oscilloscope and spectrum analyzer (EGSM900) ................................ 7–10
Measuring Rx module manually using oscilloscope and spectrum analyzer (GSM1800) ............................... 7–13
Measuring Rx module manually using oscilloscope and spectrum analyzer (GSM1900) ............................... 7–14
RM-25 measurement points in the receiver .................................................................................................................. 7–17
Calibrating RX Channel Select Filter ................................................................................................................................. 7–18
Calibrating RX .......................................................................................................................................................................... 7–19
Transmitter .................................................................................................................................................................................... 7–22
Introduction to RM-25 transmitter troubleshooting .................................................................................................. 7–22
Preparing for transmitter troubleshooting ................................................................................................................... 7–23
Troubleshooting TX-BB interface and control signals ................................................................................................ 7–25
Troubleshooting RF side of transmitter ......................................................................................................................... 7–27
Introduction to transmitter tuning .................................................................................................................................. 7–28
Tuning TX/IQ ............................................................................................................................................................................ 7–28
Tuning TX power level .......................................................................................................................................................... 7–32
Introduction to synthesizer troubleshooting ............................................................................................................... 7–40
Preparing for synthesizer troubleshooting ................................................................................................................... 7–42
Measuring the synthesizer manually using spectrum analyzer ............................................................................ 7–44
Bluetooth ........................................................................................................................................................................................ 7–45
Bluetooth component placement .................................................................................................................................... 7–45
Bluetooth settings for Phoenix ......................................................................................................................................... 7–45
Troubleshooting Bluetooth ................................................................................................................................................ 7–47
List of Tables
Table 24 RF retuning after changing a component ............................................................................................................. 7–6
Table 25 RX calibration settings .............................................................................................................................................. 7–20
Table 26 Spectrum analyzer settings ..................................................................................................................................... 7–28
Table 27 RF Control window settings ..................................................................................................................................... 7–30
Table 28 Spectrum analyzer settings for Tx power level tuning ................................................................................... 7–33
Table 29 Spectrum analyzer settings for Tx level tuning ................................................................................................. 7–34
List of Figures
Figure 107 RF key component placement ............................................................................................................................... 7–6
Figure 108 RF key components (left) ........................................................................................................................................ 7–7
Figure 109 RF key components (right) ..................................................................................................................................... 7–7
Figure 110 Receiver signal paths ............................................................................................................................................... 7–8
Figure 111 Troubleshooting flowchart for EGSM900 ......................................................................................................... 7–12
Figure 112 Probed Rx I/Q signals J730, J731 ........................................................................................................................ 7–13
Figure 113 Troubleshooting flowchart for EGSM1800 ...................................................................................................... 7–14
Figure 114 Troubleshooting flowchart for EGSM1900 ...................................................................................................... 7–16
Figure 115 Measurement points at RX frontend - part 1 ................................................................................................. 7–17
Figure 116 Measurement points at RX frontend - part 2 ................................................................................................. 7–18
Figure 117 Measurement points at baseband and digital IQs ....................................................................................... 7–18
RM-25
RF troubleshooting
Nokia Customer Care
9235618 (Issue 2) Company Confidential Page 7–3
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