No Sync Signal Jrc Radar Here

For any navigating officer or marine engineer, the radar display is the electronic eye of the vessel. When a JRC (Japan Radio Co.) radar suddenly displays the cryptic error message — or sometimes "SYNC LOSS" or "NO VIDEO SYNC" — the screen often freezes, shows snow, or goes completely dark. This is not just an inconvenience; in restricted visibility, it is a navigation hazard.

This article is for informational purposes. Always refer to the official JRC service manual for your specific radar model (JMA-6100/7100/9100/9170/NXT/NX series) before performing repairs. no sync signal jrc radar

| | Actual Problem | Verification Test | | :--- | :--- | :--- | | No target echoes but sync error present | Magnetron failed – no trigger, so no sync generated by scanner | Fire an ARPA target. Do you hear magnetron "thump"? No sound = magnetron, not sync. | | "No Sync" only on long ranges (24+ NM) | Low voltage drop on long cable runs | Check scanner supply voltage at the pedestal. Should be +24V ±10%. | | Error appears only when radar is hot | Cracked solder joint on sync transformer | Freeze spray on RD/IF board – error disappears temporarily → reflow solder. | Part 7: Real-World Case Study Vessel: 80m coastal tanker, JRC JMA-7132 radar. Symptom: "NO SYNC SIGNAL" appears after 45 minutes of operation. Radar works fine from cold start. Previous technician action: Replaced scanner cable (expensive, did not fix). For any navigating officer or marine engineer, the