HP Deskjet 450 Mobile Printer series - Manual (Page 46)

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3 Lift the print cartridge latch open and gently remove the print cartridge from
its socket at the angle shown below.
Check the number on the latch against the number on the new print
cartridge to make sure you are removing the correct print cartridge.
4 Insert the new print cartridge into its socket at the same angle at which you
removed the old print cartridge.
Check the number on the latch against the number on the print cartridge to
make sure you are inserting the correct print cartridge.
5 Close the print cartridge latch. If the cartridge is inserted correctly, closing
the latch gently pushes the cartridge into its socket. Press the latch to make
sure it is seated flat on the cartridge.
6 Close the front access cover.
7 Wait for the carriage to complete the print cartridge initialization routine and
return to the home position at the right side of the printer before using the
printer.
After the print cartridge is replaced, you need to align the print cartridges. See
Aligning the print cartridges.
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Do not open the front access cover until the print cartridge initialization is
complete.