Replacing print cartridges
When buying print cartridges, look for the print cartridge selection number.
You can find the selection number in these 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.
• HP Inkjet Toolbox: Open the HP Inkjet Toolbox, and then select the Supplies
panel.
If a print cartridge runs out of ink, the printer can operate in the ink-backup mode.
For information about installing a print cartridge, see the print cartridge installation
page.
4.5 Ink-backup mode
In the ink-backup mode, the printer operates by using only one print cartridge. The
ink-backup mode is initiated when a print cartridge is removed from the print
cartridge cradle.
For instructions about removing a print cartridge, see the print cartridge
installation page.
Ink-backup mode output
Printing in ink-backup mode slows the printer and affects the quality of printouts.
HP Deskjet 3740 series printer User's Guide
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