Specifications

Alpha 9500 HF Linear Amplifier Operating Manual Alpha Radio Products
Diagnosing Faults Product Release 1
DOCNUMBER 9500
Document Issue 1, Revision 7
Page 9–6 June 2009
99
9
Resolution 1. Ensure that the mains board is selecting the correct primary
transformer tap. See fault code 2 for information on how to do this.
2. If the correct primary tap is being selected, then the problem is
elsewhere. Unplug the amplifier, remove the top cover, and inspect
the mains board and high voltage board. Unplug each of the
transformer connectors and inspect them for problems.
Fault code 6
Description Output relay closure fail.
Explanation The master controller monitors the state of the output relay using an
auxiliary DC bias applied through a pair of RF chokes. This allows it to
determine that the output relay has traveled to the closed condition, and
that it is safe to bias the tube to OPERATE mode.
Resolution
•
Call Alpha Radio Products at 303-473-9232.
Fault code 7
Description Output relay may be stuck.
Explanation If the output relay appears to be closed when the amplifier is keyed up, it
is possible that the output relay is stuck in the ÖN condition for one of
several reasons. See Fault code 6 for more information.
Resolution
•
None. You should not see this fault in the field.
Fault code 8
Description Bandswitch set failure.
Explanation The stepper motor controller processor is unable to land the apparent
bandswitch position on the correct setting within the precision required.
Resolution 1. Turn the amplifier off and back on.
2. If the fault does not clear, turn the amplifier off, unplug it from the
AC mains., plug it back in, and power it up again.
3. If the fault still does not clear, with the amplifier on, press a
bandswitch on the front of the amplifier.
Fault code 9
Description Tune cap zero failure.
Explanation The stepper motor controller is unable to determine the zero position for
the tune capacitor.