MNC-0400-048
11 of 14
Revision B
Operation, TWTA ODU Amplifier
LHx Arc
Latched Helix Arc Fault
The maximum
number of
Momentary Helix
Arc faults has been
detected.
Check for properly
connected
waveguide, and a
properly terminated
load. If TWT has
been in stroage, run
unit in Standby for
several hours, then
try again.
LHx Arc2
Latched Helix Arc Fault on 2nd
TWT in dual tube units
The maximum
number of
Momentary Helix
Arc faults has been
detected.
Check for properly
connected
waveguide, and a
properly terminated
load. If TWT has
been instorage, run
unit in Standby for
several hours, then
try again.
Lo Drv A
Input Drive Low Alarm:
Software Power Limit function,
Constant Power
Input Drive level is
too low.
1. Increase input
drive power. 2.
Change output RF
power limit. 3.
Disable feature.
Lowline
Low-line Fault
Input A/C power is
too low, or power
supply is failing.
Check A/C power
input for proper
levels.
LowPwr A Customer settable Low
Forward RF Power Alarm
The output RF
power is below the
set minimum level.
1. Increase input
drive power. 2.
Change output RF
power minimum
level. 3. Disable
feature.
LowPwr F Customer Settable Low
Forward RF Power Fault
The output RF
power is below the
set minimum level.
1. Increase input
drive power. 2.
Change output RF
power minimum
level. 3. Disable
feature.
Table 1TWTA Fault Log Troubleshooting
Fault Log
Entry
Description
Possible Cause of
Fault
Action Needed to
Clear Fault
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