Nokia N900 Service Manual

Also see for N900: Datasheet User guide User guide User giude User guide

Table of ContentsGeneral RF troubleshooting ..................................................................................................................................4–5Introduction to RF troubleshooting ................................................................................................................4–5Cellular RF test points .......................................................................................................................................4–5Auto tuning .............................................................................................................................................................4–6Introduction to RF tunings ...............................................................................................................................4–6Auto tuning........................................................................................................................................................4–6Self test troubleshooting.......................................................................................................................................4–7Self test troubleshooting..................................................................................................................................4–7Receiver troubleshooting ......................................................................................................................................4–9Introduction to receiver (RX) troubleshooting...............................................................................................4–9GSM RX chain activation for manual measurements/GSM RSSI measurement ...........................................4–9GSM receiver troubleshooting flowchart ..................................................................................................... 4–10WCDMA RX chain activation for manual measurement .............................................................................. 4–10WCDMA RSSI measurement ........................................................................................................................... 4–11WCDMA receiver troubleshooting flowchart................................................................................................ 4–13Transmitter troubleshooting ............................................................................................................................. 4–13General instructions for transmitter (TX) troubleshooting........................................................................ 4–13GSM transmitter troubleshooting................................................................................................................. 4–14WCDMA transmitter troubleshooting ........................................................................................................... 4–16Antenna ................................................................................................................................................................ 4–17Antenna troubleshooting .............................................................................................................................. 4–17List of FiguresFigure 24 Cellular RF test points 1 ........................................................................................................................4–5Figure 25 Cellular RF test points 2 ........................................................................................................................4–6Figure 26 Phoenix GSM RSSI reading window .....................................................................................................4–9Figure 27 Phoenix WCDMA RX Control window ................................................................................................ 4–11Figure 28 WCDMA RX generator settings .......................................................................................................... 4–12Figure 29 Phoenix WCDMA RX power measurement window ........................................................................ 4–12Figure 30 Phoenix GSM RF controls window..................................................................................................... 4–14Figure 31 Antenna contacts ............................................................................................................................... 4–18RX-51Cellular RF troubleshootingIssue 1 COMPANY CONFIDENTIAL Page 4 –3Copyright © 2009 Nokia. All rights reserved.