Maris GS‑20/800 is a compact 2 kW DC power supply rated at 800 V with automatic arc‑suppression and high‑current output (≈5 A). Common failures include fuse blow or relay trip due to over‑current, regulator or voltage‑reference drift leading to output voltage sag, and internal capacitor degradation causing ripple spikes. First‑check steps: verify input mains voltage and polarity, test the main fuse and any auxiliary fuses for continuity, then measure the DC output with a calibrated voltmeter while monitoring for arc‑suppression indicator lights. If the supply still fails, inspect the internal regulator ICs and electrolytic capacitors for bulging or leakage before proceeding to component replacement.[oss-gpt-20b]