NV5LT/NV3.5LT TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
PAGE 4.1.20
VERSION 3.3 2016-03-10
Exciter A/B: Low
Battery
Exciter (amber)
This alarm occurs if the backup battery voltage falls below 2.7 V. The NV5LT/
NV3.5LT takes no action on this alarm. Use a digital multimeter to check the
battery voltage (with ac power on). If the battery voltage is low, replace the
battery. If the battery voltage is OK, cycle ac power (off, then on). If the
alarm does not clear, suspect the exciter/control PWB.
Exciter A/B: Missing
Preset
Exciter (red)
Visible only when replacing an exciter. This alarm occurs when there are no
presets programmed into the exciter. The transmitter should automatically
correct this.
Exciter A/B:
Modulation Loss
(Mod Loss)
Exciter (red)
This alarm, enabled by the user, indicates that the exciter’s audio
modulation level is below the level specified in the audio loss settings of the
active preset (see
of the Operations &
Maintenance Manual to enable/disable this alarm and to configure the
resulting action). Depending on the setting, this alarm could trigger a preset
change, inhibit the RF or have no effect (alarm only). Check the appropriate
program input(s) and the mod loss setting for the preset.
Exciter A/B: MPX
Audio Low (MPX Aud
Low)
Exciter (amber)
This alarm indicates the MPX input level is too low or is not applied. The
threshold and timing for this alarm can be adjusted in the Audio Low menu
in the user interface (see
“Setting Low Audio Thresholds” on
) of the Operations & Maintenance Manual.
Exciter A/B: No Active
10MHz (No Act
10MHz)
Exciter (red)
This alarms occurs if there is a fault with the current 10 MHz source being
used to clock the exciter. Check the external 10 MHz source or suspect the
oscillator on the exciter.
Exciter A/B: No
External 10MHz (No
Ext 10MHz)
Exciter (red)
This alarms occurs if there is a fault with the external 10 MHz source being
used to clock the exciter. Check the external 10 MHz source.
Exciter A/B: No
Transmitter
Communication (No
Xmtr Comms)
Exciter (red)
This alarm occurs if the exciter is not detecting communication over the
serial bus from the transmitter controller. This alarm is typically only visible
in the Events Log, since it will not be transmitted when communication is
interrupted.
Exciter A/B: No 1PPS
Exciter (amber)
This alarm occurs if the pilot output locking to 1 PPS is enabled and the
1 PPS signal is not present.
Exciter A/B: On Audio
Backup
Exciter (red)
This alarm occurs if the main audio source has been lost, and the exciter has
switched to the backup source as configured by the user.
Exciter A/B: PA
Missing
Exciter (red)
This alarm occurs if the exciter is unable to establish communications with
the exciter’s PA, via the PS distribution PWB. Check all connections within
the exciter.
Device and
Alarm Name
(AUI, UI)
Front Panel LED
(color)
Description and Troubleshooting Action
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