NV5LT/NV3.5LT TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
VERSION 3.3 2016-03-10
PAGE 4.1.21
Exciter A/B: PA
Voltage Fail (PA Volts
Fail)
Power Supply (red)
This alarm occurs if the power supply voltage for the exciter PA is below
20 V. Check for a blown fuse inside the exciter. Check LVPS module’s output
voltage.
Exciter A/B: Pilot
Unsync
Exciter (amber)
This alarm occurs if the pilot output locking to 1 PPS is enabled, but the
exciter has not yet locked onto the incoming signal (if present). It may
indicate that the GPS receiver is not detecting a signal. Check the GPS
receiver and antenna.
Exciter A/B: PLL
Unlock
Exciter (red)
This alarm occurs when the internal PLL of the exciter in unable to lock to
the selected 10 MHz reference. Possible causes are an out-of-range 10 MHz
input or a hardware failure on the exciter/control PWB (A1).
Exciter A/B: Power
Supply Summary
Alarm
-
Not displayed in AUI or UI status. Configurable as a remote output. This
alarm occurs if there are any alarms present that are related to the power
supplies. Check for associated alarms, and follow the associated
troubleshooting procedure, if present.
Exciter A/B: Preamp
Voltage Fail (Preamp
V Fail)
Power Supply (red)
This alarm occurs if the power supply voltage for the pre-amplifier is below
20 V. Check for a blown fuse inside the exciter. Check LVPS module’s output
voltage.
Exciter A/B: Rebooted
Exciter (Rebooted
Exc)
Exciter (red)
This is an informational alarm only that is displayed when the watchdog
timer reboots the exciter’s main microcontroller (DSP) or after an ac power
interruption.
Exciter A/B: Reboot
For Settings Needed
(Need Reboot)
Exciter (red)
This alarm indicates that exciter setup changes have been made, typically
via the AUI. Typically, the DSP will reboot itself automatically. If the alarm
persists for more than five minutes, cycle the ac power (turn off, then on) to
store the changes.
Exciter A/B: SCA 1 (or
2) Audio Low (SCA 1
or 2 Aud Low)
Exciter (amber)
This alarm indicates the SCA 1 or 2 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: SRC1 (or
SRC2) Unlock
Exciter (amber)
This alarm indicates that no valid AES/EBU stream data is being detected on
the selected AES/EBU input. Check audio input cables. The NV5LT/NV3.5LT
takes no action on this alarm.
Exciter A/B: Summary
Alarm
-
Not displayed in AUI or UI status. Configurable as a remote output. This
alarm occurs if there are any alarms present. Check for specific alarms and
troubleshoot accordingly.
Exciter A/B: SWR
Foldback
Exciter (amber)
This alarm occurs if the exciter reduces its output power due to a high SWR.
The exciter will attempt to maintain a reflected power level of 25 W at all
times. Check the connection and the RF load at the exciter’s output.
Device and
Alarm Name
(AUI, UI)
Front Panel LED
(color)
Description and Troubleshooting Action
Summary of Contents for NV3.5LT
Page 2: ......
Page 4: ......
Page 8: ...NV5LT NV3 5LT TROUBLESHOOTING MANUAL PAGE 4 VIII VERSION 3 3 2016 03 10 ...
Page 294: ...VERSION 3 3 2016 03 10 SD 32 Figure SD 32 NAFP109B Output Power Probe and Sample PWBs ...
Page 307: ...VERSION 3 3 2016 03 10 MD 8 Figure MD 8 NAPA31C Power Amplifier PWB Q1 ...
Page 322: ...NV5LT NV3 5LT TROUBLESHOOTING MANUAL LIST OF TERMS PAGE 4 6 2 VERSION 3 3 2016 03 10 ...
Page 323: ......