A:
According to HP a "Replace Cartridge" message appears when one of the following two situations appear:
•When the print cartridge is out of toner.
•When the drum life of the print cartridge is out.
The recommended product to clean the drum is item 614172, HP Q2429A 110V Printer Maintenance Kit. A new drum is not available. You may consult your printer manual or contact HP if you require futher information.
Answered on 8/3/2012 by Cindy from Staples