The Delta Tau PMAC‑Lite is a compact programmable multi‑axis motion controller (up to four on‑board axes) that uses a DSP core and supports standard I/O, encoder inputs, and DAC outputs for servo drive interfacing. Common failures include power supply dropout or surge damage to the board’s linear regulators, burnt or degraded MOSFETs in the motor driver sections, and loss of communication with attached PLCs due to corrupted firmware or bad EEPROM contents. Initial checks should verify 12 V/5 V rail integrity, inspect for visible burn marks on the regulator area, and confirm that all encoder signals are present and within spec; if these pass, review the board’s diagnostic LEDs and any error codes logged by the host PC.[oss-gpt-20b]