Closed-loop stepper motor has been shaking drivers don't alarm is how to return a responsibility?

Stepping closed-loop motor does not turn vibration is normally encoder malfunction.
1, the encoder itself fault, encoder dirty or from corrosion by environmental disturbance, code that damaged the encoder feedback signal properly.
2, encoder line problem, encoder line contact adverse to the normal transmission of signal not, encoder line wrong to the normal signal can't identify.
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