The SECO D28665 is a main PC board used in Danaher‑Motion motor drive systems, typically mounted on the motor chassis and providing PWM control, current sensing, and communication with the host controller. Common failure points for this class of boards include degraded power‑input capacitors or inductors, burnt or cracked driver ICs (e.g., MOSFET drivers), and corrosion or broken solder joints on the motor‑card connectors; overheating can also cause insulation breakdown in the current‑sense resistors. First‑check diagnostics should begin with a voltage‑probe test of the 48 V input rail and any DC bus outputs, followed by inspection of the board for visible burn marks or cracked components, and finally verify that all I/O pins to the motor card are receiving correct logic levels and that the drive’s diagnostic LEDs or error codes indicate no fault.[oss-gpt-20b]