The RTA Pavia 01.B Drive Communication Board is a digital interface module that translates motor‑drive signals into the proprietary protocol used by Pavia servo and stepper systems. Common failure points on this class of boards include burned or cracked power input traces, damaged UART/RS‑232 connectors, and failed surface‑mount components such as voltage regulators or opto‑isolators; these often manifest as intermittent communication loss or a complete “no signal” condition. First‑check steps: verify the 24 V supply to the board with a multimeter, inspect the serial connector pins for continuity and physical damage, and review any diagnostic LEDs or status codes on the drive controller for error flags.[oss-gpt-20b]