The Weldlogic PA‑10/100 is a dual‑range (10 A / 100 A) precision pulsed arc welding power supply that uses a soft DC arc starter and closed‑loop servo control to maintain current stability and extend tungsten life. Common failure points for this class of low‑current welding systems include the arc initiation circuitry, the internal MOSFET or IGBT driver stages, and the servo‑controlled current feedback loop; overheating or contamination can also damage the power conversion board. First‑check diagnostics: verify that the unit receives its rated input voltage and that all fuses/thermal cutouts are intact, inspect the arc starter and MOSFET heat sinks for signs of burn or oil residue, and review any error codes displayed on the control panel to isolate a specific fault in the current regulation loop.[oss-gpt-20b]