The Toyoda CACR‑15‑TK1 is a 3‑phase AC servo drive PWM unit used in high‑speed motion control systems. Common failure modes for this class include overheating of the power MOSFETs, loss of phase current balance, and degradation of the internal I²C/serial communication interface; these often manifest as over‑temperature alarms or intermittent loss of drive output. First‑check steps: verify that the unit’s 48 V DC input is within spec and that all phase currents are balanced; inspect for burn marks on MOSFETs, blown fuses, or loose connectors; then review any stored error codes via the serial port to identify specific fault flags before proceeding with component replacement.[oss-gpt-20b]