Installing a new ADF If the HP LaserJet 3300mfp came without an ADF, an ADF can be added. An ADF may need to be replaced if it has abnormal media jams. To install a new or If you are replacing an existing ADF, you 3 3 Install the new ADF by inserting the hinges straight down into the product. 4 Push down both tabs until they click. 4 EN Installing a new ADF 67 1 2 must first pull up both hinge tabs before lifting the ADF up out of the product. 2 On the new ADF, unfold the hinges and pull up the tab on each hinge.