HP LaserJet MFP Upgrade Kit for HP LaserJet 8000 and 8100 Printers - User Guide, not orderable

Appendix A Regulatory Information 83
Overview
Note Any changes or modifications to the printer that are not expressly approved
by HP could void the user’s authority to operate this equipment.
Use of a shielded interface cable is required to comply with the Class B
limits of Part 15 of FCC rules.
Note The printer without the HP Digital Copy complies with Class B limits.
For more regulatory information, see the HP LaserJet MFP Upgrade Kit online
user guide.