The SECO D28665 is a main PC board used in Danaher Motion drives and Bridgeport motor control systems, typically handling power‑stage regulation and signal processing for servo or stepper applications. Common failure points on this class of boards include degraded MOSFETs or IGBTs, blown capacitors on the high‑voltage side, and burnt-out driver ICs due to overcurrent or thermal overload; inspection often reveals discoloration or cracking around power traces. First‑check diagnostics should verify that the board receives correct input voltage and ground reference, inspect for visible damage or overheating on power components, and confirm that all I/O signals are within spec using an oscilloscope or logic analyzer before proceeding to component replacement.[oss-gpt-20b]