Receiver Test Points; Transmitter Troubleshooting; General Instructions For Tx Troubleshooting - Nokia RM-132 Service Manual & Parts Manual

RM-132; RM-133
RF Troubleshooting and Manual Tuning Guide

Receiver test points

Measure RF ASIC
N7505
RXIP J7508
RXIN U87
RXQP J7510
RXQN J7529
Band RF ASIC
N7505
GSM850 L7504
GSM900 L7505
GSM1800 L7501
GSM1900 L7500

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
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.
Steps
1. Connect a module jig to a computer with a DAU-9S cable or to a FPS-10 flash prommer with a modular
cable.
Make sure that you have a PKD-1 dongle connected to the computer parallel port.
Issue 1
RF ASIC N7500
J7508 400 mVpp and 700mVDC
J7509 400 mVpp and 700mVDC
No test point 400 mVpp and 700mVDC
No test point 400 mVpp and 700mVDC
RF ASIC 7500
No test point 881,66771 MHz at 50dBm
No test point 942,46771 MHz at 50dBm
C7515 1842,86771 MHz at
50dBm
C7514 1960,06771 MHz at
50dBm
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Expected Result
Expected Result
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