RESPONDING TO ALARMS VX150 TO VX2 TROUBLESHOOTING MANUAL
PAGE 3.1.26 VERSION 2.0 2023-04-20
No Exciter Comms The System Interface PWB is not receiving
valid communication packets from the Exciter.
The System Interface PWB receives a valid
communication packet from the Exciter.
This alarm is most likely caused by
temporary comms interruptions during
software upgrades or Exciter reboots. If
the alarm is occurring outside of those
cases check the connection between the
Exciter and System Interface Board.
No Nameplate License
The License.json file loaded from the SD card
at boot is corrupted or missing.
When present, this alarm may limit the output
power of the transmitter. If the Transmitter
model is a VX1 it’s likely you will observe PA2
failures.
This alarm requires an AC cycle or Exciter
reboot to clear.
To remain cleared, the system must boot with
a valid license file.
The most likely cause of this alarm is
installation of a new generic SD card
after replacement. By default, the SD
does not contain any license file as this
file is unique to each transmitter. It is
also possible that the license file has
become unreadable due to corruption.
Contact Nautel customer support for your
transmitter’s license key and instructions
on how to re-load the key.
On Audio Backup This alarm will trigger when the Transmitter
switches to operating on a backup audio
source as configured in the active preset.
This alarm will clear immediately when the
main audio source returns.
Performing an alarm reset will clear this
alarm.
This alarm should always be present with
a low audio alarm. It serves as an
additional indicator that a switch to the
backup audio source has occurred.
PA 1 Bias Fail The Autobias routine was unable to reach the
150mA target bias current for PA 1 within the
timeout of 3 minutes or within the allowable
minimum and maximum bias voltages.
This alarm is cleared by starting the Autobias
routine.
Performing an alarm reset will clear this
alarm.
Check PA 1 connections, fuse, and FET.
The most likely cause of this alarm is a
bad connection or failed PA.
Attempt to re-run the Autobias routine.
Check the System Interface Board (See
SD-9) TP5 & TP6 voltage matches the PA
(1) Bias meter when RF is ON and
operating.
Consider replacing PA 1. See
Power
Amplifier PWB Replacement on
page 3.1.60.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting
To Next Page
Loading...
