HP LaserJet 4 Service Manual - Page 301

8 Parts and Diagrams How To Use the Parts Lists The figures in this chapter illustrate the major subassemblies and component parts of the HP LaserJet 4/4M, LaserJet 4 Plus/ 4M Plus, and LaserJet 5/5M/5N printers. When ordering an electrical part, pay special attention that the part chosen has the correct voltage rating for the machine under repair. Part numbers with no indicator in the Notes column are stocked and can be ordered through Hewlett-Packard's Support Materials Organization (SMO). Parts marked with an S in the Notes column are special order parts which can be ordered through SMO but may have an eight-week lead time. An alphanumeric index referencing all part numbers is included at the end of this chapter (see Parts List, page 8-40). Note Not all parts are orderable. The parts listed are the only orderable parts. Parts that have no reference designator or part number are not field-replaceable and cannot be ordered through SMO. Figures referred to in the tables are placed before the table throughout the chapter. Accessory Parts are listed on 8-33. This list includes such items as the MIO and SIMM cards. Parts and Diagrams 8-1