No Sync Signal Jrc Radar Jun 2026

The sync signal (trigger pulse) coordinates the rotation of the antenna with the sweep on the display. Without it:

The most common culprit behind a "No Sync Signal" alarm lies in the physical connections of the ship. The maritime environment is hostile to electronics; constant vibration, salt mist, and temperature fluctuations take a heavy toll on cabling. The synchronization pulse travels via a specific wire (often a coaxial cable or a twisted pair within the main radar bus) from the antenna unit to the display. If this cable is corroded, loose, or damaged—perhaps by maintenance work on the bridge wing or wear and tear in the cable trunking—the signal cannot pass. Furthermore, water ingress into the antenna unit connector is a frequent occurrence on aging vessels. A simple visual inspection of the bulkhead connections and the scanner unit often reveals moisture or oxidized pins, which are sufficient to ground the weak sync voltage and trigger the alarm.

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 (also known as trigger pulse or heading pulse). no sync signal jrc radar

: Check the main installation cable for damage, corrosion, or loose pins, specifically at connector J301 (in the CAE-529-1 unit) or J1002/J1003 (in the CBD-1783 unit).

Even a momentary drop in shipboard power can cause the radar to lose sync or restart. Insufficient power is a leading reason for scanners failing to rotate or transmit. The sync signal (trigger pulse) coordinates the rotation

– Connect other scanner to this display. If sync works, original scanner is faulty.

A JRC radar relies on several pulses to create a synchronized image. If any of these are lost, the "No Sync" error may trigger: The synchronization pulse travels via a specific wire

A "No Sync Signal" error on a JRC radar indicates a break in communication between the antenna scanner (the rotating unit outside) and the display processor (the screen inside). Without this signal, the radar cannot determine the antenna's angular position, resulting in a blank or stationary screen and an inability to generate a map.