Alpha Radio Products
Product Release 1
9
DOCNUMBER 9500
Document Issue 1, Revision 7
June 2009 Page 9–1
9
Diagnosing Faults
9.1 Overview 9–1
9.2 Fault Codes and Resolutions 9–1
9.1 Overview
One of four situations typically results in a fault:
Table 9-1
Fault situations
Fault description
Fault
type
Amplifier action
Incorrect gain (output too low or too
high for the input power supplied)
Soft The OPR switch turns
OFF and the STBY
switch turns ON.
High reflected power (SWR)
Incorrect plate voltage (too high) Hard The amplifier shuts
OFF c
ompletely.
RF arc in output circuit including
ante
nna
In fault mode, the tube is biased off a
nd the relays are placed in bypass
mode, so that RF from the amplifier goes directly to the antenna. The FLT
(Fault) switch below the 7-segment display lights and the fault number is
displayed.
If the tube current exceeds about 1.6 A (causing the ampl
ifier to switch to
ON1), diagnose and resolve the fault as described below.
9.2 Fault Codes and Resolutions
Fault numbers and descriptions are as follows:
Table 9-2 Fault code summary
Number Description
1 Gain fault
2 Tap not found
3 Soft Ip trip
4 Hard Ip trip
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