The Digiplan PDS15E‑D is a compact, MOSFET chopper‑regulated stepper/servo drive that operates from 110–240 VAC with an integrated switch‑mode power supply and built‑in regenerative dump circuit for low‑power applications. Common failure modes include overheating of the internal power stage (often due to blocked airflow or overcurrent), failure of the MOSFETs or gate driver ICs, and degradation of the onboard protection circuitry such as short‑circuit or overload relays. First‑check diagnostics should verify that the AC input voltage is within spec, confirm that the unit’s thermal fan/heat sink is clear and functional, and inspect for visible signs of component burn or corrosion on the power board; a quick continuity test of the MOSFETs and gate driver outputs can quickly rule out major failures.[oss-gpt-20b]