The Unit Fires but Nothing Happens: A Diagnostic Tree for No-Exposure Faults
A dental X-ray unit that presses dead — no beep, no exposure light, no image — sends a whole practice into a scramble. This is a top-down diagnostic tree for the no-exposure fault: how to work the failure chain from the wall socket through the interlocks, exposure switch, control board, and high-voltage stage safely and in order, so you localize the fault instead of guessing at parts.