"I just replaced the belt in my 500. The belt is jumping teeth on the gear of the plotter causing streaks in the solid colors. Belt is installed correctly, but the spacing of the teeth seems to be off. I want to find out what can be done about the belt."
If the belt is slipping on the motor pulley, it is because the belt tensioner is clipped down in the service position or the motor pulley still has debris in the teeth from the old belt. The fix is to remove the right end cover and use a small screw driver to unclip the tensioner wedge and allow the spring to tension the belt and/or remove the left cover and clean the motor pulley with a jeweler's screwdriver and a small wire brush.