Transmitter Troubleshooting; General Instructions For Tx Troubleshooting - Nokia E62 Service Manual

RM-88
RF Troubleshooting and Manual Tuning Guide
RSSI Reading window, select the appropriate band and channel.
4. In the
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
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.
Issue 1
RSSI Reading window
Figure 47
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