HP 1100dtn - Manual (Page 59)

ENWW 4-9
4 Lift up the handle of the printhead and use it to pull the printhead straight up and out of
its slot.
5 Install the new printhead in the color-coded slot that matches the color of the printhead.
6 Press down firmly on the printhead to ensure proper contact after installation.
7 Close the printhead access latch firmly, ensuring the hook catches the carriage lock, and
then close the printing supplies cover. You will need to use some force to close the
printhead access latch.