Make sure you purchase the right ink cartridges for your specific printer. Cartridges are not compatible between different brands, and often not within the same brand. HP recommends that you use Original HP ink cartridges. XL (Extra Large) cartridges cost more but do provide better value in the long run. They will be able to print at least double the pages of a regular cartridge. Our advice is that if you print often, go with XL. However, ink can dry up. So if you are not a frequent printer, go with the regular cartridges. HP recommends that you replace any missing cartridges as soon as possible to avoid print quality issues and possible extra ink usage or damage to the ink system. Never turn off the printer when ink cartridges are missing.Which ink cartridges do I need for my HP Officejet Pro 6230 Printer?
For your US, European and UK HP Officejet Pro 6230 you need HP 934 Black and HP 935 Cyan/Magenta/Yellow cartridges. There are also Combo Packs (4 cartridges in one pack) available, like the HP 934XL Black and 935 Tri-color (Cyan, Magenta, Yellow) Combo Pack.
Replace the cartridges
1. Make sure the printer is turned on.
a. Remove the new ink cartridge from its packaging.
! Do not touch the copper-colored electrical contacts !
b. Pull the orange tab on the wrapper straight back. Make sure that you remove the orange pull-tab completely otherwise, ink might leak from the cartridge. When you remove the plastic wrap, the paper label on the top of the cartridge tears slightly, which is necessary to properly vent the cartridge.
5. Hold the cartridge by its sides, and then twist the protective orange cap counter-clockwise to snap it off the cartridge. You might need to apply some force to move the cap. Do not touch the copper-colored contacts or the ink nozzles. Touching these parts can result in clogs, ink failure, and bad electrical connections.
7. Repeat steps 3 through 5 for each ink cartridge you are replacing.
8. Align the printhead if necessary.
The printer automatically aligns the printhead during the initial setup. However, you might want to use this feature when the printer status page shows streaking or white lines
through any of the blocks of color or if you are having print quality issues with your printouts. Load Letter or A4 unused plain white paper into the input tray first. You can align the printhead from the printer’s control panel, from the HP printer software or embedded web server (EWS).