Sony Magnescale EM5101 Linear Scale is a magnetic displacement sensor used in precision positioning systems; it outputs a digital readout via a multi‑gap head that detects linear motion. Common failures on this model include loss of signal due to coil winding damage, insulation breakdown between the magnetic core and housing, and drift or offset caused by accumulated dust or corrosion on the contact pads. For troubleshooting, first verify that the supply voltage (typically 12 V DC) is within spec and check for continuity across the sensor terminals; next inspect the head assembly for visible debris or misalignment, and finally review any error codes displayed on the associated digital readout unit.[oss-gpt-20b]