Encoders come in several types, the two most common are linear and rotary.
Each encoder type is available in absolute and incremental output. Absolute encoders provide an output signal that describes a distinct location, whereas an incremental encoder provides an output signal that is relative to a starting point. The starting point is usually reset after power loss. There are many variations in the electrical output signal used by the encoder: analog, digital, quadrature, Grey code, parallel, and others. When repairing these encoders, it is critical to test them correctly; matching the encoder type with the proper test apparatus. At Control System Labs, we have the expertise to identify the defective component, replace it, and fully test the repair to make sure the unit is working properly.