The Penny & Giles JC600‑008MOD01 is a rugged multi‑axis joystick controller used for operator input in industrial machinery, offering analog voltage or digital communication outputs and optional dead‑man switches. Common failure modes include worn potentiometer tracks causing drift or loss of resolution, Hall effect sensor failures leading to intermittent signals, and internal PCB shorts from moisture or mechanical shock that can trigger open circuits on the output channels. First‑check diagnostics: verify the unit’s power supply voltage and polarity, measure the analog output waveforms for continuity and correct range, and inspect all wiring harnesses and connector pins for corrosion or broken traces before proceeding to board‑level testing.[oss-gpt-20b]