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HP 8600 B&W *copies* very faint but printing color/monochro... - HP Support Community - 7766373
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6978 printhead removal - HP Support Community - 6346612
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HP Officejet 6000 (E609a) and 6000 Wireless (E609n) Printers - Cleaning the Printhead | HP® Customer Support
HP Officejet Pro 8600 Plus has white streaks only in the "Blue" print Cartridge (I attempted cleaning the printhead). | MacRumors Forums
How to Clean an HP Printhead – Printer Guides and Tips from LD Products
6978 printhead removal - HP Support Community - 6346612
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