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RF tunings after repairs
The following tunings have to be performed after repairs:
•
Repairs in the Tx part require "Tx Power Level Tuning".
•
When component replacements around the modulator area (RF path from
UEM via RF ASIC to RF PA) have been done, "Tx IQ Tuning" is additionally
required.
•
In general Rx repairs, the front-end always requires "Rx Calibration" and "Rx
Band Filter Calibration" for all three bands.
•
Repairs in the PLL circuit always require "Rx Calibration" of the low band.
•
If the RF ASIC is replaced, all calibrations mentioned above have to be done.
Refer to Chapter 3, Service Software Instructions, for instructions on the above-mentioned tun-
ings.
52
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
7 - RF Description and Troubleshooting
RA-2/3
Issue 1 09/04
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Table of Contents
Troubleshooting
