HP Officejet Pro 251dw Printer series - Manual (Page 52)

Make sure that you insert the ink cartridge into the slot that has the same colored
letter as the color you are installing.
6. Repeat steps 3 through 5 for each ink cartridge you are replacing.
7. Close the ink cartridge access door.
Related topics
Ink cartridges and printheads
Store printing supplies
Ink cartridges can be left in the printer for extended periods of time. However, to assure
optimal ink cartridge health, be sure to turn off the printer properly. For more
information, see Turn the printer off.
Anonymous Usage Information Storage
The HP cartridges used with this printer contain a memory chip that assists in the
operation of the printer.
In addition, this memory chip stores a limited set of anonymous information about the
usage of the printer, which might include the following: the date when the cartridge was
first installed, the date when the cartridge was last used, the number of pages printed
using the cartridge, the page coverage, frequency of printing, the printing modes used,
any printing errors that might have occurred, and the printer model.
Chapter 4
48 Work with ink cartridges