The Heldt & Rossi DX808 is a DC servo amplifier used to convert controller signals into motor power for industrial drives. Common failure points in this class include degraded power supply capacitors, burnt gate drivers on the MOSFET array, and overheating of the output stage due to inadequate cooling or overcurrent conditions; these often manifest as high‑temperature warnings or sudden loss of drive capability. First‑check diagnostics: verify that the input voltage is within spec and that all connector pins are secure; inspect the power supply board for bulging capacitors or burnt components; review any error codes logged by the controller, especially those indicating overcurrent or temperature excursions.[oss-gpt-20b]