HP LaserJet 8000 Multifunction Printer series - Manual (Page 255)

Appendix A Specifications 255
Paper Specifications
requirements specified in this user guide and in the HP LaserJet Printer
Family Paper Specification Guide. (To order the guide, see page 36 .)
Always test paper before purchasing a large quantity.
CAUTION Using paper outside HP specifications may cause problems for the printer,
requiring repair. This repair is not covered by the Hewlett-Packard warranty
or service agreements.