The Nikki Denso NCR‑CAB1A2C‑401A is a compact industrial controller used in servo‑driven motion systems, typically providing logic and I/O for motor drives. Common failure points for this class of units include power supply voltage spikes, capacitor degradation on the main board, and solder joint fatigue at high‑current I/O pins; overheating can also cause internal fuse trips or regulator burnout. First‑check diagnostics: verify that the input voltage matches the spec (±5 % tolerance) and that the unit’s LED status indicators are within normal patterns; inspect all power and signal connectors for corrosion or loose contacts, then review any stored error codes via the controller’s diagnostic interface before proceeding to component testing or board replacement.[oss-gpt-20b]