The Ferrcontrol S04‑00‑2Q 675 Darc Card is a high‑voltage servo drive interface that modulates the 600 VDC intermediate circuit from its supply module into the three‑phase motor voltage required for precise positioning of synchronous motors. Common failure modes in this class of cards include burnt or tripped MOSFETs, damaged gate drivers, and degraded isolation transformers due to overcurrent or voltage spikes; overheating of the card’s heat sink is also a frequent issue. Initial troubleshooting should verify that the supply module outputs correct 600 VDC under load, inspect the card for visible burn marks or swollen capacitors, and check all I/O connectors and gate driver signals with an oscilloscope before proceeding to component replacement.[oss-gpt-20b]