Nautel NV5, Troubleshooting Manual

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NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-17
Exciter A/B: Low
Backup Battery This alarm occurs if the backup battery voltage falls below an
acceptable level (2.7 V). Check the battery voltage. If battery voltage
is low, replace battery. If battery voltage is OK, cycle ac power (off,
then on). If the alarm does not clear, suspect the NVE exciter PWB.
Exciter A/B: Missing
External Preset This alarm occurs if the transmitter has not sent a preset configuration
to the exciter. Can occur of the exciter has been power-cycled, but the
transmitter has not, in which case the alarm should clear on its own. If
the alarm persists, contact Nautel.
Exciter A/B: Need
Reboot For Settings This alarm indicates that NVE setup changes have been made,
typically via the Hardware Configuration page of the AUI. Cycle (turn
off, then on) the power to the exciter to store the changes.
Exciter A/B: No
Active 10 MHz This alarms occurs, in the transmitter log only, if no external or Exgine
10 MHz clock is being detected. If the alarm persists, the exciter may
have experienced a TCXO failure or an improperly installed OCXO
upgrade.
Exciter A/B: No
Exgine 10 MHz This alarms occurs, in FM+HD or HD mode, if no 10 MHz clock is
being detected from the Exgine PWB (A3). Check the cable between
the Exgine PWB and J13 of the NVE exciter PWB (A1). Check that
the Exgine PWB is correctly powered up..
Exciter A/B: No Ext
10 MHz This alarms occurs if no external 10 MHz is detected. Check the
10 MHz input.
Exciter A/B: No HD
Data This alarms occurs, in FM+HD or HD mode, if IBOC data is not
detected from the Exgine PWB. Digital carriers are muted. Verify the
RJ45 cable between the Exgine PWB (A3) and J11 of the NVE exciter
PWB (A1) is seated properly. Check that the Exgine PWB is correctly
powered up.
Exciter A/B: No
Reverse Path This alarm indicates the RF sample from the transmitter output is
below a preset threshold. The pre-correction function will not operate.
Exciter A/B: No
Transmitter Comms This alarm, which is only displayed as a log entry, occurs if the
transmitter is not communicating with the exciter. Check the
transmitter link cable.
Exciter A/B: No 1PPS This alarm occurs if the pilot output locking to 1 PPS is enabled and
the 1 PPS signal is not present.
Alarm (with Prefix) Description and Troubleshooting Action