4. In the
RSSI Reading
window, select the appropriate band and channel.
Figure 47
RSSI Reading
window
5. To start the measurement, activate GSM Rx chain, click
Start
.
Results
RSSI reading values of the selected band and channel are displayed. The RSSI level must be the same value
which is set at the signal generator (-90 dBm).
If RSSI reading is far away from -90dBm, try to do RX tuning. Change engine if problem still shows up after
re-tuning.
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".
• 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 DKE-2 cable or to a FPS-10 flash prommer with a modular cable
(XCS-4).
Make sure that you have a PKD-1 dongle connected to the computer's parallel port.
RM-88
RF Troubleshooting and Manual Tuning Guide
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 7 –11
Copyright © 2006 Nokia. All rights reserved.
