Harris Atlas DVL400, Technical Manual

Page: 150 / 180

5-4 888-2473-001 2/25/03
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments ATLAS Series™
5.3 PA Module Auto Bias Procedure
Due to natural drift of LDMOS devices with age, periodic re-biasing of the pallets
within the modules is recommended. However, this procedure has been automated
and is done with the press of a button, and only takes a few seconds. The schedule
for this procedure is as follows:
•
Once a month for the first 6 months of operation
•
Once every 6 months after that.
To perform the Auto Bias of the PA Modules, you will need to access the screen
shown in Figure 5-3. The quickest way to get there is to press the Power Amp quick
button to the right of the GUI, then press - PA SERVICE - PA MOD ALIGN.
Figure 5-3 Auto Bias, PA Module Alignment Screen
To activate the Re-Bias procedure simply press the Re-Bias button on the screen.
Please be sure to read the Warning note on the screen above. And remember, even
though the carrier will only be removed for about 5 seconds, many receivers may
take several more seconds to re-gain lock and start decoding pictures again. In other
words,
this procedure should only be done when an interruption of service is
not critical .
Key Presses