Nokia RM-313 Service Manual

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Contents

Nokia RM-313 Service Manual Manual pdf 135 page image

Receiver troubleshootingIntroduction to receiver (RX) troubleshootingRX can be tested by making a phone call or in local mode. For the local mode testing, use Phoenix servicesoftware.The main RX troubleshooting measurement is RSSI reading. This test measures the signal strength of thereceived signal. For GSM RSSI measurements, see GSM RX chain activation for manual measurements / GSMRSSI measurement (page 4–11). For a similar test in WCDMA mode, see WCDMA RX chain activation formanual measurement / WCDMA RSSI measurement (page 4–12).GSM RX chain activation for manual measurements/GSM RSSI measurementPrerequisitesMake the following settings in Phoenix service software:Setting GSM850 GSM900 GSM1800 GSM1900Phoenix Channel 189 37 700 661Signal generatorto antennaconnector881.46771MHz(67.71KHz offset)at -60dBm942.46771MHz(67.71kHz offset)at -60dBm1842.86771MHz(67.71kHz offset)at -60dBm1960.06771MHz(67.71kHz offset)at -60dBmSteps1. Set the phone to local mode.2. Activate RSSI reading in Phoenix (Testing→GSM→RSSI reading )ResultsThe reading should reflect the level of the signal generator (-losses) +/- 5 dB.When varying the level in the range -30 to -102 dBm the reading should then follow within +/-5 dB.RM-313RF troubleshootingIssue 1 COMPANY CONFIDENTIAL Page 4 –11Copyright © 2007 Nokia. All rights reserved.