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Ink cartridges and printheads
Ordering cartridges online is not supported in all countries/regions. However, many countries
have information on ordering by telephone, locating a local store and printing a shopping list. In
addition, you can select the How to Buy option at the top of the www.hp.com/buy/supplies page
to obtain information about purchasing HP products in your country.
Use only the replacement cartridges that have the same cartridge number as the ink cartridge
you are replacing. You can find the cartridge number in the following places:
• The ink supplies label (located inside the printer, near the ink cartridges).
• The HP SureSupply Web site (
www.hp.com/buy/supplies). For more information, see Order
printing supplies online.
• The label of the ink cartridge you are replacing.
• The HP software on your computer:
◦ Solution Center (Windows): Click Status, and then click Estimated Ink Levels. The
My Cartridges tab lists the currently installed cartridges. The All Cartridges tab lists all
supported cartridges for the device.
- Or -
Go to the Shopping tab, in the Printable Shopping List, and then click Print My
Shopping List. A page containing the list of supplies, including the replacement
numbers will be printed.
◦ Toolbox (Windows): Click the Estimated Ink Levels tab, and then click the Cartridge
Details button to view information about replacement ink cartridges.
◦ HP Printer Utility (Mac OS X): Open the Information and Support panel, and the click
Supply Info.
◦ Embedded Web server: Click the Information tab, and then click Device Information
in the left pane.
• The self-test diagnostic page. For more information, see
Understand the self-test report.
NOTE: Ink level warnings and indicators provide estimates for planning purposes only.
When you receive a low-ink warning message, consider having a replacement cartridge
available to avoid possible printing delays. You do not need to replace cartridges until
prompted to do so.
HP 940 Black/Yellow Officejet Printhead C4900A
HP 940 Magenta/Cyan Officejet Printhead C4901A
Appendix A
244
HP supplies and accessories