hp designjet 1050c plotter makes grinding noise durring startup then gives error

Answer 1

HOw do you chnge the clutch

Answer 2

This belt / grinding noise is caused most often by the belt tensioner not engaging fully. when you replace the belt make sure the tensioner has sprung back into place fully. I have had to pry it a little with a screwdriver. These machines are getting old and the plastic parts are starting to act funny!