Removal and Installation 4. Disconnect the Line Sensor Connector from the Carriage PCA. 5. Insert a flat screwdriver inside the Line Sensor clip in order to release it. 6. Once the clip is released, rotate the Line Sensor downwards so that the locating pins on both sides are also released. 8-54 HP DesignJet 5000 and 5500 Series Printers Service Manual