The RTA Pavia GMD‑04 is a compact stepper motor drive rated for 95–140 V DC and 5–12 A current, featuring microstepping up to 800 steps/rev and configurable via dip switches or an optional RMM36 card. Common failure modes in this model include overheating of the power MOSFETs due to inadequate heat sinking, insulation breakdown between stator windings leading to short‑circuits, and loss of step resolution from worn motor leads or damaged driver ICs. Initial diagnostics should verify that the supply voltage is within spec and stable, inspect the drive for visible burn marks or swollen capacitors, and check the motor wiring continuity and polarity before reviewing any fault codes displayed on the unit’s status LEDs.[oss-gpt-20b]