If you have verified antenna rotation, checked cable continuity, and the diagnostic menu still shows zero sync pulses:
The "No Sync Signal" error on a JRC radar typically indicates a critical communication failure between the display unit (processor) and the antenna (scanner unit). This message generally means the display unit is not receiving the necessary synchronization pulses—specifically the trigger or bearing signals—required to render the radar sweep on the screen. Common Causes of "No Sync Signal" no sync signal jrc radar
"Get the lead line," Elias ordered, a command from a different century. "And someone get to the mast. If that scanner motor isn't spinning, we’re ghost meat." If you have verified antenna rotation, checked cable
(Azimuth) or the cable carrying that data back to the display. Inspect the Interunit Cable If you have verified antenna rotation