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You can find the selection number in three places:
● Selection number label: Look at the label on the print cartridge that you are replacing.
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 Level 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.
Photo print cartridge Colors print as grayscale.
Gray photo print
cartridge
Colors print as grayscale.
Note HP does not recommend using the photo print cartridge or the gray photo
print cartridge for ink-backup mode.
Chapter 3
16 HP Deskjet 6940 series