VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.27
PA Fail/PA1 Fail In all models this alarm will trigger if the PA
current is less than 50mA while the system is
RF ON and operating.
In VX1.5 and VX2 this alarm will also trigger if
the PA current is less than 50% of the average
of the two PA current meters.
This alarm must be cleared by performing an
alarm reset in the Front Panel UI, AUI, or via
the transmitters discrete remote I/O.
Check PA 1 connections, fuse, and FET.
The most likely cause of this alarm is a
bad connection or failed PA.
Consider replacing PA 1. See
Power
Amplifier PWB Replacement on
page 3.1.60.
PA 2 Bias Fail The Autobias routine was unable to reach the
150mA target bias current for PA 2 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 2 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) TP7 voltage matches the PA 2 Bias
meter when RF is ON and operating.
Consider replacing PA 2. See
Power
Amplifier PWB Replacement on
page 3.1.60.
PA2 Fail This alarm will trigger if the PA current is less
than 50mA while the system is RF ON and
operating.
It will also trigger if the PA current is less than
50% of the average of the two PA current
meters.
This alarm is only present in VX1.5 & VX2
models.
This alarm must be cleared by performing an
alarm reset in the Front Panel UI, AUI, or via
the transmitters discrete remote I/O.
Check PA 2 connections, fuse, and FET.
The most likely cause of this alarm is a
bad connection or failed PA.
Consider replacing PA 2. See
Power
Amplifier PWB Replacement on
page 3.1.60.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting
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