If you are technically proficient and comfortable with marine electronics, a systematic approach to diagnosis is recommended. Always power off the radar completely before inspecting any physical connections.
The ship groaned, banking hard as a wall of black rock materialized out of the fog, missing the hull by less than twenty feet. As the Northern Star
Miller stripped the wire, re-clamped the terminal, and radioed down. "Try it now!" JRC Radar TXRX(AZI) Troubleshooting Guide | PDF - Scribd
The multi-core data cable running up the mast or radar arch flexes under heavy seas, breaking internal copper conductors.