In addition to cleaning the cartridge, replacing the cartridge, cleaning the
ink "well" and rubber wiper used for wiping cartridge head, using "approved"
paper, printing in econofast mode (less ink), and setting up "transparency"
print mode (gives more time for drying), one thing is often overlooked:
|Printer and Photocopier Troubleshooting and Repair Collection : HP600C DeskJet produces too much black i..
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(From: Ralph Wade Phillips (firstname.lastname@example.org).)
Did you also clean the cartridge HOLDER? See HP's web page for more
details, but I've seen SEVERAL of the 600 family that have "dust" collected
under the cartridge holder. Since the black hits at a different angle than
the tricolor cartridge, it is more prone to hitting the dust buildup,
causing excessive smearing.
BTW, beware of flipping the entire printer over to unlatch the top - you may
get a shower of the last n years excess ink from the holding tank!