The Oki Electric Industry KHL49LL42A is a low‑voltage stepper motor designed for precise positioning in industrial or automotive control systems. Common failure modes for this class of motors include winding insulation breakdown, rotor detachment, and gear train wear; electrical faults often manifest as loss of torque, irregular stepping, or overheating due to overcurrent. Initial checks should verify the supplied DC voltage matches the motor’s rated value (typically 24–48 V), inspect the coil windings for continuity and resistance within spec, and examine the mechanical assembly for loose bearings or damaged gear teeth. A quick visual inspection of connectors and a review of any error codes from the drive controller will help isolate electrical versus mechanical issues.[oss-gpt-20b]