Heidelberg SM52-4 problem: need help

[Anastasia]

Hey! Can anyone help us with the following problem for SM52-4:
When on idle speed, the machine starts slow down and speed up by itself.
The machine doesn't show any errors.
Have changed encoder HDM 63.101.2211, but no result..

Have anyone faced the same problem before?

 

[Ercupa]

you need to test the encoder motor. However if you have tech documentation, etc you can do it for DYF.
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