HP 3390 Service Manual - Page 131

User-replaceable parts To remove and replace the all-in-one tray 2 pickup roller, the tray 2 or tray 3 separation pad, or the ADF pickup roller, see Replacing the tray 2 pickup roller on page 42, Replacing the tray 2 and optional tray 3 separation pad on page 47, or Replacing the ADF pickup-roller assembly on page 50. Required tools ● #2 Phillips screwdriver with a magnetic tip and a 152-mm (6-inch) shaft length ● Small flatblade screwdriver ● Needle-nose pliers ● ESD mat (if one is available) ● Penlight (optional) CAUTION Always use a Phillips screwdriver (callout 1). Do not use a pozidrive screwdriver (callout 2) or any motorized screwdriver. These can damage screws or screw threads. CAUTION Do not pull directly on the wires to disconnect them. Always pull on the plastic body of a connector to avoid damaging the connector wires. Figure 5-1 Phillips and pozidrive screwdriver comparison Before performing service ● Remove all media. ● Unplug the power cable and interface cable(s). ● Place the all-in-one on an ESD mat (if one is available). If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part. ● Remove the print cartridge. ● Remove the tray 2 cassette. ● Lift the all-in-one off of the optional tray 3 (if it is installed). After performing service ● Return all media to the trays. ● Plug in the power cable. ENWW Introduction 109