Table 2-1. Helpful Documentation (continued) Item Description or Use Part Number Service and Support CD-ROM for the HP LaserJet 4050 Printers An interactive training CD-ROM for printer service representatives and customer care specialists. C4251-91011 HP LaserJet 4000 and 4050 Series Printers Service Manual A combined service manual for both series of printers. C4251-91003 Parts and Supplies 2-5