A:AnswerPage 82 of the user's guide for your printer has detailed instructions for replacing the print cartridges. You can access the user's guide at the following HP website:
http://h10032.www1.hp.com/ctg/Manual/c01949965.pdf
A:AnswerSince all of the cartridges are separate, you will only need to change the cartridge that is empty. You do not need to change all of the cartridges at the same time.