LDJ Electronics Inc. 450‑20C Magnetizer is a capacitor‑discharge magnetic field generator used to energize or demagnetize high‑current coils in industrial drives and power‑conditioning equipment. Common failure modes include degraded discharge capacitors (high ESR, leakage), transformer winding insulation breakdown, PCB solder joint cracks from thermal cycling, and controller IC failures due to overvoltage spikes. First‑check diagnostics: verify input voltage and ripple on the 0–600 V supply rail; inspect the discharge capacitor bank for bulging or electrolyte leakage; visually examine the transformer core and windings for signs of arcing or insulation damage; review any stored error codes from the built‑in diagnostic LED or serial interface.[oss-gpt-20b]