Sony Magnescale SR‑2711 is a magnetic linear scale module that feeds position data to an LF‑200 digital readout; the unit contains three small PCB assemblies and a magnetic sensor strip. Common failure modes include misalignment of the magnetic track, corrosion or wear on the sensor contacts, and internal board faults such as damaged trace connections or failing ICs that cause erratic or zero output. For a first‑check diagnosis: verify proper mechanical alignment against the reference rail, inspect the PCB for cracked traces or burnt components, and confirm power supply voltage to the scale board; then read any diagnostic codes from the LF‑200 and perform a short‑circuit test on the sensor strip to isolate electrical faults.[oss-gpt-20b]