Astec ACV 15D0.8 is a ±15 V, 0.8 A linear power supply commonly used in industrial control panels and PLCs to provide isolated DC rails for logic circuits. Common failure modes for this class of supplies include overheating due to over‑current or shorted load, degraded output regulation from aging rectifier/transformer components, and capacitor leakage causing voltage sag or ripple spikes. First‑check diagnostics: verify input AC voltage and current draw against spec; measure the 15 V DC rails with a multimeter for correct polarity and stability; inspect the supply enclosure for burn marks, swollen electrolytics, or loose connections before proceeding to component replacement.[oss-gpt-20b]