Bystronic 01 10012199 is a laser supply unit (DCM815 model) that converts 360‑510 VAC into the high‑current outputs required for Bystronic laser cutters (typically 8×1500 W, 15 A at 250 V). Common failure modes include overheating of internal power MOSFETs or IGBTs, degradation of output capacitors leading to voltage ripple, and failure of protection circuits such as over‑current/over‑temperature relays. First‑check diagnostics: verify the input mains voltage and phase balance; inspect the unit for visible signs of thermal damage or burnt components; test the output rails with a calibrated multimeter while monitoring temperature; review any error codes displayed on the machine’s HMI or log files for indications of power supply faults.[oss-gpt-20b]