Zelko Screen Industries 04001‑02 Driver board is a high‑current industrial motor driver used in screen‑printing presses and other heavy‑load CNC equipment. Common failure modes for this class of boards include burnt or cracked power MOSFETs, degraded gate drivers, and shorted protection diodes due to overvoltage spikes or thermal overload. Initial checks should verify the supply rails (input voltage, output current capability), inspect for visible arcing or component damage, and test I/O logic levels against the controller’s specifications. If a fault code is present, cross‑reference it with the unit’s service manual; otherwise perform a continuity test on the MOSFET channels and measure gate drive voltages under load.[oss-gpt-20b]