HP 3900 series - Manual (Page 11)

1 Selection number label
● Printer documentation: For a list of print cartridge selection numbers, see the
reference guide that came with the printer.
● Print Cartridge Ordering Information dialog box: For a list of print cartridge
selection numbers, open the printer
Toolbox , click the Estimated Ink Levels tab,
and then click the Print Cartridge Information button.
If a print cartridge runs out of ink, the printer can operate in ink-backup mode .
For information about installing a replacement print cartridge, see the print cartridge
installation page.
Ink-backup mode
Use the ink-backup mode to operate the printer with only one print cartridge. The ink-
backup mode is initiated when a print cartridge is removed from the print cartridge
cradle.
Ink-backup mode output
Printing in ink-backup mode slows the printer and affects the quality of printouts.
Installed print cartridge Result
Black print cartridge Colors print as grayscale.
Tri-color print cartridge
Colors print but black is grayed and is
not a true black.
Exit ink-backup mode
Install two print cartridges in the printer to exit ink-backup mode.
For instructions about installing a print cartridge, see the
print cartridge installation
page.
User's guide 9