Sony Magnescale LF‑200 is a dual‑axis digital position readout (DRO) designed for precision linear motion systems, operating on 110 V AC with a 20 VA power rating. Common failure points in this class of DROs include degraded optical encoder contacts, burnt or tripped relays on the front‑panel LED/indicator circuitry, and capacitor degradation in the power supply section; surface‑mount components may also suffer from solder joint fatigue. First‑check diagnostics should begin with a visual inspection for corrosion or physical damage to the display panel and connector pins, followed by verifying that the unit receives 110 V ±5 % with no voltage spikes, and then testing the encoder outputs against known good reference signals while monitoring the DRO’s error code register for any fault flags.[oss-gpt-20b]