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CHPA SERIES
4.9 Verifying RF Alarm and RF Fault Trip Points
This part of the procedure verifies that the RF alarm and RF fault operation is functioning
normally. These settings were verified in a previous procedure. (Refer back to that procedure if
necessary.)
7. Continue to adjust the RF SETTING control to just over 600 W(500W for the 600W DBS band
unit 415W for the 500W DBS band unit). The High RF Alarm should come on; this is
indicated by the HiRF on Line 2.
8. If possible, continue to adjust the RF SETTING control to just over 620 (425W for the DBS
band unit). The user will observe Auto Fault Recycle operation during this step. The
following sequence will occur within approximately 3 seconds:
a. The TRANSMIT LED will extinguish and the FAULT LED will be lit briefly.
b. The High RF Fault message will appear briefly.
c. The TRANSMIT LED will flash as the CHPA recycles through the Beam On Sequence
state back to the Transmit state.
d. Once the CHPA is in the Transmit state, the High RF Fault will be detected and steps a
through c will occur two more times before the CHPA latches into the Fault state.
e. Once the CHPA is latched into the Fault state, the FAULT LED will flash.
9. Adjust the attenuator setting to the setting noted in step 6.
10. Press the CANCEL pushbutton and adjust the unit RF power. The FAULT LED will go off.
The CHPA will then transition to the Standby state and the STANDBY LED will light.
11. If no options are to be tested, switch off the main power to the CHPA, remove the RF Input
and Output test loads, and make the normal RF Input and RF Output connections.
This completes the initial power-on and checkout procedure. If the CHPA is to be computer
controlled, use the following procedure. Also, check any optional equipment at this time such
as the Remote control panel and/or integral linearizer.
THE CHPA IS NOW READY FOR NORMAL OPERATION. (Refer to Chapter 5 for normal
operating procedures.)
4-8
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