The E‑PA60T‑PS pulcom‑T is a Tokyo Seimitsu amplifier/controller designed to drive up to four precision measuring heads in grinding or lathe applications, operating from 100 VAC and featuring a compact PCB with high‑current MOSFET drivers. Common failure points for this class of units include power supply board degradation (capacitor burn‑outs, regulator dropout), I/O connector wear on the head‑interface pins, and firmware corruption leading to communication errors or stuck status LEDs. First‑check diagnostics: verify 100 VAC input voltage and ripple with a multimeter; inspect the PCB for burnt components or cracked traces, especially around the MOSFETs and regulator; confirm proper handshake on the serial/USB interface by reading any error codes from the host software.[oss-gpt-20b]