The Hesston 700‑712‑654 Rev D Baler Control is a field‑bus controller that manages motor drives, safety interlocks, and operator interface for agricultural balers. Common failure points in this class of units include degraded power supply rails (especially the +12 V/–12 V lines), failed I/O relays or contactors, and burnt-out MOSFETs on the drive output stage; overheating can also cause capacitor leakage or PCB delamination. First‑check diagnostics: verify that all input voltages are within spec and inspect the power supply board for burn marks or swollen electrolytics; test each digital/analog I/O channel with a multimeter or oscilloscope for continuity and correct voltage levels; finally, review any stored fault codes on the controller’s diagnostic display to pinpoint a specific subsystem.[oss-gpt-20b]