The Movomatic EM261A is an industrial encoder used for high‑precision position sensing in servo drives and motion control systems. Common failure modes include loss of signal due to coil winding damage, insulation breakdown from over‑voltage or thermal stress, and mechanical wear on the magnetic sensor interface. Begin by verifying that the supply voltage matches the specified ±12 VDC (or ±24 VDC) range and checking for any visible arcing or burn marks on the board; then test the encoder output with an oscilloscope to confirm sinusoidal waveforms and proper amplitude, followed by a continuity check of the coil windings and insulation resistance measurement against ground.[oss-gpt-20b]