HP Officejet Pro 8100 ePrinter - N811a N811d - Manual (Page 81)

Remove and reinstall the printhead
1.
Make sure that the printer is turned on.
2. Open the top cover and the ink-cartridge access door.
3. Lift the latch handle on the print carriage.
4. Remove the printhead by lifting it up and then pulling it out of the printer.
Printhead maintenance 77