NV5LT/NV3.5LT TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
VERSION 3.3 2016-03-10
PAGE 4.1.17
Controller: SWR
Shutback
Output Network (red) This alarm occurs if the transmitter's reflected power exceeds the SWR
shutback threshold (600 W). The transmitter will shut back and attempt to
find a safe operating point by entering its SWR foldback mode. This may be
the result of a transient SWR condition (arc or lightning) within the output
transmission line or antenna system. Attempt to reset the latched condition
by pressing Reset [using the remote AUI’s Reset button (see
of the Operations and Maintenance Manual) or using the
local front panel display (see
“Resetting alarms” on page 1.2.67
the Operations and Maintenance Manual)]. Inspect the output transmission
line and antenna for punctures or damage. If no damage can be found,
suspect the output power probe (A15). See also Cutback Active alarm.
Controller:
Transmitter PA
Biasing
-
This is an informational alarm only that is displayed when the bias routine
has been initiated.
Controller: Turn On
Delay
Exciter (red)
This alarm occurs, if the turn-on delay function is enabled, and transmitter is
not permitted turn-on until the delay period elapses. The turn-on delay
function is enabled upon an ac power failure and is typically used to add
delay for use with an external generator.
Controller: Very Low
Forward Power (Very
Low Fwd Power)
Output Network
(amber)
This alarm occurs if transmitter’s average forward power is below the low
forward power threshold (defaulted to 12.5% of the setpoint and is user
adjustable). Check for associated alarms, and follow the associated
troubleshooting procedure, if present.
Controller: +1.2V Fail Power Supply (red)
This alarm occurs if the +1.2 V supply in the controller is 10% higher or
10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see
Module Replacement” on page 4.1.46
).
Controller: +1.8V Fail Power Supply (red)
This alarm occurs if the +1.8 V supply in the controller is 10% higher or
10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see
Module Replacement” on page 4.1.46
).
Controller: +3.3V Fail Power Supply (red)
This alarm occurs if the
+3.3 V
supply in the controller is 10% higher or
10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see
Module Replacement” on page 4.1.46
).
Controller: +15V Fail
Power Supply (red)
This alarm occurs if the +15 V power supply in the controller is 2 V higher or
2 V lower than the desired value.
Controller: -15V Fail
Power Supply (red)
This alarm occurs if the -15 V power supply in the controller is 2 V higher or
2 V lower than the desired value.
Device and
Alarm Name
(AUI, UI)
Front Panel LED
(color)
Description and Troubleshooting Action
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Page 307: ...VERSION 3 3 2016 03 10 MD 8 Figure MD 8 NAPA31C Power Amplifier PWB Q1 ...
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