The Bausch & Lomb ACU‑Rite III is a high‑precision digital readout (DRO) used to provide real‑time axis position feedback on milling, lathe and grinding machines. Common failure points in this class of DROs include power supply degradation, faulty LCD backlight or display driver ICs, and loss of signal from the encoder or linear scale due to cable wear or connector corrosion. Initial diagnostics should verify that the unit receives its rated input voltage (typically 12 V DC) and check for any visible damage or loose connections on the power and signal cables; inspect the LCD panel for flicker or dead pixels, and review any error codes displayed or logged by the DRO’s internal diagnostic routine.[oss-gpt-20b]