HP 220 - Manual (Page 134)

19 Remove the drive roller from the plotter. Reassembling: Ensure that the bearing
assembly at the right end of the drive
roller is seated in the right sideplate and
completely on the right side of the axial
bias plate.
Axial bias plate
Bearing assembly
Calibration: Perform the accuracy
calibration after installing the drive
roller. (Details D chapter 7.)
6Ć70 Removal and Replacement C3187Ć90000