Nautel VX150, Troubleshooting Manual, Page: 25 / 182

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.17
Exciter DC Voltage Failure Any of the following Exciter PWB voltage
meters meet the stated criteria for a period of
at least 5 seconds:

Exciter PWB +5V Meter measures less
than +2.5 V or greater than +7.5 V

Exciter PWB +3.3V Meter measures less
than +1.65 V or greater than +4.95 V

Exciter PWB +2.5V Meter measures less
than +1.25 V or greater than +3.75 V

Exciter PWB +1.5V Meter measures less
than +0.75 V or greater than +2.25 V

Exciter PWB +1.1V Meter measures less
than +0.55 V or greater than +1.65 V
All of the following Analog Audio PWB
voltage meters meet the stated criteria for a
period of at least 5 seconds:

Exciter PWB +5V Meter measures
b2.5 V and +7.5 V

Exciter PWB +3.3V Meter measures
b1.65 V and +4.95 V

Exciter PWB +2.5V Meter measures
b1.25 V and +3.75 V

Exciter PWB +1.5V Meter measures
b0.75 V and +2.25 V

Exciter PWB +1.1V Meter measures
b0.55 V and +1.65 V
If the Exciter PWB +12V Failure alarm is
present, this is the most likely cause, so
refer to the troubleshooting for that
alarm.
Check the corresponding voltage test
points on the Exciter PWB using a digital
multimeter.
The next most likely cause is a
component failure on the Exciter PWB.
Consider replacement of the Exciter PWB.
See
Exciter PWB Replacement on
page 3.1.37
.
Exciter Fault Summary alarm that is triggered if any of the
following alarms are triggered:

E12V Failure

Exciter DC Voltage Failure

PGA Failure

Invalid FPGA Image Signature
Cleared if all of the following alarms are
cleared:

E12V Failure

Exciter DC Voltage Failure

FPGA Failure

Invalid FPGA Image Signature
Summary alarm to indicate a possible
serious fault with the Exciter PWB. See
the troubleshooting for the associated
alarms in order to clear this alarm.
External Interlock Open connection between pins 1 and 2 on the
transmitter’s Interlock connector (Exciter J7). Closed connection between pins 1 and 2 on
the Transmitter’s Interlock connector. If integrated in a site interlock system,
then verify the status of that interlock
connection.
If using a jumper, verify the presence of
a jumper by examining transmitter rear
panel Interlock connector.
A mating connector and jumper are
installed in the Transmitter Interlock
connector before shipping.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting