HP Color LaserJet Enterprise CM4540 MFP - Software Technical Reference

In the User Defined Low Threshold area, select a percentage life remaining next to the cartridge
or image transfer/fuser kit to define the low threshold alert level for that cartridge or image transfer/
fuser kit.
Click Apply Now to save the new settings.
Protect Direct Ports
In the Printer Settings section of the HP Utility, select Protect Direct Ports to disable printing over
USB and parallel ports. JetDirect, embedded network connectivity, and third-party add-on cards, such
as FireWire, will not be affected by this setting.
Figure 5-28 Protect Direct Ports screen
Click Disable Direct Ports.
160 Chapter 5 Macintosh software and utilities ENWW