3. To perform the measurement, click Start.
Transmitter troubleshooting
General instructions for Tx troubleshooting
Context
• Do not transmit on frequencies that are in use!
• Transmitter can be controlled in the local mode for diagnostic purposes.
• The most useful Phoenix tool for GSM transmitter testing is "RF Controls" and in WCDMA transmitter testing
the best tool is "Tx Control"..
• Tx IQ tuning and Tx power tuning can be also used in some cases.
• Remember that retuning is not a fix! Phones are tuned correctly in production.
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 test jig to a computer with a DAU-9S cable or to a FPS-8 flash prommer with a modular cable.
Make sure that you have a PKD-1 dongle connected to the computer's parallel port.
2. Connect a DC power supply to a module jig (MJ-48).
Note:
When repairing or tuning a transmitter, use an external DC supply with at least 3 A current
capability.
Set the DC supply voltage to 3.9 V and set the jumper connector on the test jig's reg.pass switch to
“ON” position.
3. Connect an RF cable between the RF connector of the module test jig (MJ-48) and measurement equipment
or alternatively use a 50 ohms (at least 2 W) dummy load in the module test jig RF connector, otherwise GSM
or WCDMA PA may be damaged.
Note:
There are three antenna connectors in the module jig:
• one for GSM
• one for WCDMA
• one for Bluetooth
RM-42
Nokia Customer Care
RF Troubleshooting and Manual Tuning Guide
Page 7–14
Company Confidential
9241872 (Issue 1)
Copyright ©2005 Nokia. All Rights Reserved.
