The Parker 10M435 is a two‑axis analog joystick used in industrial control panels, typically providing voltage or PWM outputs to drive servo drives or hydraulic valves. Common failure modes for this class of units include worn potentiometers or encoders causing drift or loss of resolution, cracked housing leading to shorted contacts, and power supply ripple damaging the internal circuitry. Initial checks should verify that the joystick’s input voltage matches spec (typically 24 VDC), inspect the potentiometer tracks for continuity and mechanical play, and confirm output signals with a multimeter or oscilloscope while moving the stick through its full range. If the unit is integrated into a larger control system, review any error logs from the host controller for related I/O faults before proceeding to component replacement.[oss-gpt-20b]