Zhijie Electronic PQ32/30‑40305A is a high‑current power supply board used in PQ32/30 series motor controllers, typically supplying 400 V AC to the drive’s inverter section. Common failure points on this board include burnt or tripped MOSFETs, degraded heat sink mounting, and damaged transformer windings; overheating of the main power transistor is a frequent symptom. First‑check steps: verify input voltage and phase balance with a multimeter, inspect for visual signs of component damage (burn marks, cracked capacitors), and test the output current capability while monitoring junction temperatures. If any fault persists, proceed to isolate individual MOSFETs and check the transformer secondary winding resistance against spec.[oss-gpt-20b]