The Magnescale LH70‑3 is a three‑axis digital readout (DRO) display used with precision measuring instruments such as the GB‑ER, SJ700A or PL20C scales; it receives signals from linear encoders and outputs calibrated displacement data via a 12 VDC power supply. Common failure modes for this unit include loss of display output due to a faulty LCD panel or backlight, drift or incorrect readings caused by encoder cable breaks or connector corrosion, and power‑supply failures (e.g., blown fuses or degraded DC regulator). Additionally, the device may exhibit intermittent “no signal” errors if the internal firmware encounters corrupted configuration data. First‑check diagnostics: verify 12 VDC supply voltage at the unit’s input terminals; inspect the encoder cable for continuity and secure connector seating; review any error codes displayed on the unit or logged by the host controller.[oss-gpt-20b]