The Jensen MK II 871224 Analog Servo Controller is a field‑rated industrial drive that converts low‑voltage control signals into high‑current motor output and includes built‑in overload protection. Common failure modes for this class of analog controllers include power supply or regulator degradation, burnt-out MOSFETs or IGBT drivers from overcurrent events, and capacitor leakage in the input filtering network; a shorted feedback loop can also trigger the safety cut‑off. For initial troubleshooting verify that the 24 V DC supply is within spec and stable, inspect the board for obvious signs of component damage (burn marks, bulging capacitors), and check the motor current sense resistors for continuity and correct value before reviewing any fault codes or status LEDs on the unit.[oss-gpt-20b]