No Sync Signal Jrc Radar May 2026

Before opening panels or calling a technician, perform these quick checks:

A failing capacitor in the scanner’s 24V or 12V DC supply can introduce AC ripple. The sync generator requires clean DC to produce a square wave. Ripple causes the comparator circuit to miss zero-crossings, triggering a "No Sync" alarm.

Located inside the antenna pedestal, this component measures rotation. no sync signal jrc radar

Radar sync errors are often preventable. Follow this JRC-recommended PM (Preventive Maintenance) schedule:

Fix:

Work safely – radar contains high-voltage capacitors. De-energize and wait 5 minutes before opening units.

The multi-conductor cable between the display and the scanner carries power, trigger, video, and sync. Over time (5–15 years), corrosion, moisture ingress, or broken strands in the sync pair cause intermittent or total loss. Before opening panels or calling a technician, perform

In a marine radar system, the rotating antenna (scanner) and the display processor must be perfectly synchronized. Every time the antenna passes a specific point (usually the bow or an index line), a timing pulse is generated. This is the Sync Signal (also known as trigger pulse or heading pulse).

The processor uses this signal to:

If the display sees no sync signal, it cannot map echoes to bearing or range. The screen typically goes blank, freezes, or shows massive radial noise.