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thanks for the reply I have had the servo apart and cleaned the comm and brushes etc but I don't think it has a tacho generator fitted as it only has the 4 main brushes it is fitted with a 2500 line ...

Hi I am having problems with a hitachi seiki 3ne with fanuc 6t control. the machine suddenly started to mis position / miscount on the x axis
I thought this might be an encoder issue so I changed it...