Encoders can offer a variety of challenges to repair. The problems could be electronic in nature. They can be physical in nature. Or they could just be contaminated.
Rotary Encoders have a disk that creates the pulses that generate the feedback signal to the motor control. If this disk is damaged, or has oil on it, then the pulses could be compromised. The encoder pictured here has a metalic disk with evenly spaced holes that create the pulses of the feedback signal. Often the disk is made of glass with a magnetic grid painted or embossed to it. Damage to the disk is often not repairable and the encoder must be replaced.
Sometimes the repair is just a matter of carefully cleaning the disk and testing the encoder.
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