Removal and Installation 4. Install the Carriage Cover. NOTE Make sure the cover is installed vertically, if not the Cover Retaining Pins can be broken. 5. Clip the Carriage Cover on both sides of the Carriage Assembly by pushing the clip downwards (with force if necessary). NOTE Make sure the clips are locked correctly, if not the Carriage Cover could become loose and cause major damage to the printer. NOTE You must perform the following Calibration when the Line Sensor is replaced: Scan Axis Calibration ⇒ Page 5-7 . 8-56 HP DesignJet 5000 and 5500 Series Printers Service Manual