Tecnetics Industries Inc. SC400 20976602 is the main control board used in Tecweigh SC400 industrial weighing systems, serving as the central processor and interface for load cells, display, and communication modules. Common failure modes on this board include power‑rail dropout or voltage regulator failure, burnt or cracked surface‑mount components (especially capacitors and ICs), solder joint fatigue on high‑current traces, and firmware corruption that can cause the unit to hang or report error codes. First‑check diagnostics should verify proper 24 V/5 V supply levels with a multimeter, inspect for visible damage or cold solder joints under magnification, confirm I/O signals (e.g., load‑cell excitation, RS‑232/Modbus lines) are within spec, and review any stored error logs or diagnostic LEDs for clues.[oss-gpt-20b]