User Guide

Receiver test points
Measure RF ASIC
N7500
Expected
Result
RXIP J7515 400 mVpp
and
700mVDC
RXQP J7517 400 mVpp
and
700mVDC
RXQN No test
point
400 mVpp
and
700mVDC
Band RF ASIC
7500
Expected
Result
GSM1800 C7515 1842,8677
1 MHz at
-65dBm
GSM1900 C7514 1960,0677
1 MHz at
-65dBm
Transmitter troubleshooting
General instructions for Tx troubleshooting
Context
• Tx troubleshooting requires Tx operation.
• Do not transmit on frequencies that are in use.
• Transmitter can be controlled in the local mode for diagnostic purposes.
• The best diagnostic tool for GSM transmitter testing is RF Controls, and for the WCDMA transmitter testing
Tx Control.
Tx IQ tuning and Tx power tuning can be also used in some cases.
• Remember that retuning is not a repair procedure.
The first set of steps instructs how to assemble the test setup. This setup is general for all Tx troubleshooting
tasks.
Alternative steps provide specific troubleshooting instructions for Phoenix service software. The first section
is for the EGSM900/GSM1800/GSM1900 bands and the latter for WCDMA.
Caution: Never activate the GSM or WCDMA transmitter without a proper antenna load. There should
be always 50 ohm load connected to the RF connector (antenna, RF-measurement equipment or at
least 2 watts dummy load), otherwise GSM or WCDMA PA may be damaged.
RM-100
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
Issue 2 COMPANY CONFIDENTIAL Page 7 –17
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