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Fault Log
Entry
Cbl ILOK
Cable Interlock Fault
CstPwr A
Constant Power mode
suspended.
Cvr ILOK
Cover Interlock Fault
DCV LOW Low DC Voltage Alarm -
voltage on computer board.
Ext ILOK
External Interlock Fault
Fan Lock
Fan Fault
FW CHSUM Firmware Checksum Alarm
HEATER F Heater Fault
MNC-0400-048
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Table 1TWTA Fault Log Troubleshooting
Description
8 of 14
Operation, TWTA ODU Amplifier
Possible Cause of
Fault
A cable other than
Check all cables for
the M&C cable has
proper connection.
come loose.
RF input power has
Check input power
suddenly dropped.
level. Look for loose
or disconnected RF
cable.
The top cover of a
Re-install top cover.
rack unit has been
removed.
The DC bias voltage
Call customer
to the computer
service.
module has
dropped below the
minimum level.
The M&C connector
Check for
has been
disconnected cable
disconnected, or
or a cable with no
there is no jumper in
interlock jumper.
the M&C cable to
See manual with
close the interlock.
addendum, ODU
External Interlock,
MNC-0000-026,
Table 1.
Fan is not operating
Clean fan and filter.
correctly
Ensure fan spins
freely.
The program
Call customer
memory has
service.
changed, or
program memory
has failed.
Heater Power
Call customer
Supply, or failed
service.
TWT filament.
Action Needed to
Clear Fault
Revision B
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