| | 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. |
(e.g., JMA-5212, JMA-9100)? Is the scanner/antenna rotating? Did this error appear suddenly? no sync signal jrc radar