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Fast axis anti-rotate bearing?

Posted: Tue Jan 29, 2019 7:10 am
by 3DTOPO
My 310 came with the error: "Axis excessive position error".

I replaced the timing belt, the servo, rebuilt the carriage and I still sometimes get that error.

The troubleshooting manual says one of the causes of the error is "Fast axis anti-rotate bearing missing". I would like to check the part, but I have no idea what it is referring to. Any insight would be greatly appreciated!

Also, does anyone know what a properly tensioned belt means?