The Toyoda CACR‑20‑TK1 is a 220 VAC AC servo drive controller that provides PWM output and segment display for speed, position, or torque control in industrial machinery. Common failure points for this class of units include degraded power supply filtering capacitors, burnt MOSFETs or IGBTs in the PWM stage, and worn feedback encoder connections; these often manifest as erratic motion, high‑temperature hotspots, or loss of display indication. First‑check diagnostics: verify 220 VAC input voltage and ground continuity, inspect the board for burn marks or swollen electrolytics, and read any fault codes from the built‑in diagnostic LED or serial interface before proceeding to component replacement.[oss-gpt-20b]