Receiver test points
Measure
RF ASIC
N7505
RF ASIC N7500
Expected Result
RXIP
J7508
J7508
400 mVpp and 700mVDC
RXIN
U87
J7509
400 mVpp and 700mVDC
RXQP
J7510
No test point
400 mVpp and 700mVDC
RXQN
J7529
No test point
400 mVpp and 700mVDC
Band
RF ASIC
N7505
RF ASIC 7500
Expected Result
GSM850
L7504
No test point
881,66771 MHz at 50dBm
GSM900
L7505
No test point
942,46771 MHz at 50dBm
GSM1800
L7501
C7515
1842,86771 MHz at
50dBm
GSM1900
L7500
C7514
1960,06771 MHz at
50dBm
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.
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.
RM-132; RM-133
RF Troubleshooting and Manual Tuning Guide
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 7 –17
Copyright © 2006 Nokia. All rights reserved.
