Results for: c6100
If you need help replacing the cartridges on your C7280 printer, watch this video and see if it helps.
You can find the same information by going to HP's website (or Google) and searching for 'c01079583' (lowercase c does matter).
This video may apply to other printers as well. As I identify the other printers this works for, I'll update this description.
I am an HP employee but I do not represent HP on this site.