The Penny & Giles JC8000 is a rugged multi‑axis electronic joystick controller designed for heavy‑duty industrial applications, featuring contactless sensor technology and a low under‑panel depth for tight integration. Common failure points in this class of devices include worn mechanical detents after millions of cycles, degradation of the contactless Hall‑effect sensors due to dust or vibration, and power supply ripple affecting signal accuracy. First‑check diagnostics: verify 24 V DC input stability with a multimeter, inspect the sensor housing for debris and ensure proper grounding; then test the joystick output signals on an oscilloscope for linearity and noise, and review any diagnostic LEDs or error codes displayed by the controller.[oss-gpt-20b]