14 Rear (face-up) output door 15 Power connector 16 Tray 2 paper-length adjustment control Model and serial numbers The model number and serial number are listed on an identification label located underneath the top door. The label contains information about the country/region of origin and the revision level, manufacturing date, production code, and production number of the product. The label also contains power rating and regulatory information. Figure 1-1 HP Color LaserJet 2820/2830/2840 all-in-one identification labels (1 of 12) Figure 1-2 HP Color LaserJet 2820/2830/2840 all-in-one identification labels (2 of 12) ENWW Device parts 7