Results
RSSI reading values of the selected band and channel are displayed.
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 most useful Phoenix tool for GSM transmitter testing is "RF Controls".
• 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.
Caution:
Never activate the GSM 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 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-26).
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-26) and measurement equipment
or alternatively use a 50 ohms (at least 2 W) dummy load in the module test jig RF connector, otherwise the
GSM PA may be damaged.
Note:
There are two antenna connectors in the module jig:
• one for GSM
• one for Bluetooth
Make sure that all connections are made to the correct RF connector.
Normally a spectrum analyser is used as measurement equipment.
Note:
The maximum input power of a spectrum analyser is +30 dBm.
To prevent any damage, it is recommended to use 10 dB attenuator on the spectrum analyzer input.
4. Set Tx on.
i
Set the phone module to the test jig and start Phoenix service software.
ii Initialize connection to the phone. (With FPS-8 use FBUS driver when using DAU-9S and COMBOX driver).
iii From the File menu, choose product: File -> Choose Product -> xx-x* (* = type designator of the phone).
iv From the toolbar, set operating mode to “Local”.
RM-57/58
RF Troubleshooting and Manual Tuning Guide
Nokia Customer Care
Issue 1
Company Confidential
Page 7–11
Copyright ©2005 Nokia. All Rights Reserved.
Summary of Contents for RM-57
Page 391: ...www s manuals com ...
