VX150 TO VX2 TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
VERSION 0.1 2020-12-01
PAGE 3.1.9
Entered Firmware Upgrade This alarm occurs when the exciter is in “firmware upgrade” mode. It should only be
displayed during a transmitter software upgrade.
E12V Fail
This alarm occurs if the +12 V supply in the exciter PWB is 10% lower or 10% higher than
the desired value. Check the output voltage of the 12 V power supply module (U2). If
necessary, replace the 12 V power supply module (see
????
). T
here may also be a problem
with the controller’s power supply PWB.
Exciter Audio Reset
Exciter DC Voltage Fail
Exciter Failure
External Interlock
This alarm occurs when the external interlock input wired to the EXT INTLK terminal is open.
The transmitter will not be able to enable its RF output. Check the interlock connection on
the rear of the transmitter. If the interlock connection is intact, check that all external
interlock switches are closed. If no problem is found with the connection at the transmitter or
any of the external interlock switches, suspect a problem with the interlock circuitry on the
exciter/control PWB (A1).
Fan1/2 Fail
This alarm occurs if the speed of cooling fan 1 is below 3000 RPM (half of its nominal value
of 6000 RPM). If either fan 1 or 2 fail, the transmitter takes no action (no effect on the RF
output). If the alarm occurs for fans 1 or 2, check the connection between the indicated fan
and the PS Distribution PWB (A2). If these connections look OK, replace the indicated fan
(see “Cooling fan replacement” on page 1-42). If the alarm still occurs after the fan has been
replaced, suspect the PS distribution PWB.
FPGA Version Mismatch
Forward Power Shutdown
This alarm occurs if the transmitter tries to reduce the forward power below minimum (
?? W
)
due to repeated
Forward Power Limiting
alarms. The transmitter latches off. See
Forward
Power Limiting
for troubleshooting tips
Front Panel User Interface
Failure
This alarm occurs if there is a fault with the front panel user interface (UI), preventing it from
being used to control the transmitter. The transmitter will automatically switch to remote
control mode to allow use of the AUI or digital I/O.
High Ambient Temperature This alarm is indication only and occurs if the transmitter’s ambient temperature exceeds
60°C (140°F
). Check the intake air filter or cooling fans.
High PA Temperature
This alarm occurs if the power amplifier’s heatsink temperature exceeds
85°C (185°F)
. This
alarm is most likely caused by excessive ambient temperature, a fan failure or blockage, or
excessive power amplifier dissipation. This alarm will clear when the power
amplifier’s heatsink temperature decreases to
75°C (167°F
).
Alarm Name
Description and Troubleshooting Action
Summary of Contents for VX150
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Page 90: ...VERSION 0 1 2020 12 01 MD 2 Figure MD 2 VX1 5 VX2 Transmitter NOT AVAILABLE AT TIME OF PRINT...
Page 91: ...VERSION 0 1 2020 12 01 MD 3 Figure MD 3 NAPI189 Analog Audio PWB...
Page 92: ...VERSION 0 1 2020 12 01 MD 4 Figure MD 4 NAPI187 System Interface PWB...
Page 94: ...VERSION 0 1 2020 12 01 MD 6 Figure MD 6 NAPI188 Power Supply Interface PWB VX1 VX1 5 VX2...
Page 95: ...VERSION 0 1 2020 12 01 MD 7 Figure MD 7 NAPI193 Front Panel User Interface PWB...
Page 96: ...VERSION 0 1 2020 12 01 MD 8 Figure MD 8 NAPA41 Pre Amp IPA PWB...
Page 97: ...VERSION 0 1 2020 12 01 MD 9 Figure MD 9 NAPA40 Power Amplifier PWB...
Page 98: ...VERSION 0 1 2020 12 01 MD 10 Figure MD 10 NAPF16 Low Pass Filter PWB...
Page 99: ...VERSION 0 1 2020 12 01 MD 11 Figure MD 11 NAPP15 Directional Coupler PWB...
Page 100: ...VERSION 0 1 2020 12 01 MD 12 Figure MD 12 NAPH15 2 Way Splitter PWB VX1 5 VX2...
Page 101: ...VERSION 0 1 2020 12 01 MD 13 Figure MD 13 2 Way Combiner PWB Nautel Part PU03A VX1 5 VX2...
Page 103: ...VX150 TO VX2 TROUBLESHOOTING MANUAL LIST OF TERMS PAGE 3 5 2 VERSION 0 1 2020 12 01...
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