- Hewlett-Packard Printer User Manual

Parts and Diagrams for the Duplexer
The figures in this section illustrate the major subassemblies and
component parts of the HP LaserJet 4+/5 Duplexer.
Note
Not all duplexer 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
HP.
A -28 Duplexer