No Sync Signal Jrc Radar ((exclusive)) [Genuine 2026]

The "No Sync Signal" error on a JRC (Japan Radio Co.) radar typically indicates a communication failure between the display unit and the scanner unit (transmitter/receiver). This critical alert prevents the radar from rendering an image because the timing pulses required to sweep the display are missing. Common Causes Defective Interunit Cable:

• Locate the sync signal lines in the scanner cable shield (refer to your JRC manual’s interconnection diagram).
• Measurement: Probe between SYNC+ and SYNC- (or SYNC and GND for single-ended).
• Expected waveform: A 0-5V or ±2.5V differential pulse, 1–10 microseconds wide, occurring once per antenna revolution (plus a "heading marker" – a longer pulse at ship's heading).
• What you may see:

  : It tells the transmitter exactly when to fire a burst of energy. Timing Reference

  T/R Control Circuit: A fault in the CMC-1205R (T/R control circuit) can stop the trigger signal output. no sync signal jrc radar

  1. Faulty Scanner Cable or Connectors (90% of cases)

  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.

  If the signals are present at the scanner but missing at the display, the interunit cable is faulty. The "No Sync Signal" error on a JRC (Japan Radio Co

  Power Supply Fluctuations: 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.

  A "No Sync Signal" error in a JRC radar system can occur due to various reasons, including: Locate the sync signal lines in the scanner

  Spare parts & likely repairs