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Belt is jumping on scan axis motor when the carriage is on the left

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HP Designjet 120/520
Microsoft Windows 10 (64-bit)



I have problem. When I want to change printhead, the carriage go to the left and, it seems to not detect the end of the run. 

So the motor continu to turn and it produce error : Carriage cannot move..


Strip encoder is clean and scan axis is lubrificate. 



Thank you very much for your help

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Make sure that the belt tensioner is working properly. Is the belt tight or loose?

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