L7550 Poor Print Quality after 1st page

I have a L7550 All-in-one printer. It woked fine for about 11 months then the black/yellow print head went out. I replaced it and ever since, the first page I print is good and every page after that has streaks through the print and progressively gets worse. I've done every test/maintenance found in the owner's manual with no luck! Any info would be greatly appreciated!

HI,
I've seen this issue before on one of my printers, although I don't have the L7550. There is a similar document for my printer that helped me and I found this one on the Product Support page for the L7550.
I'd follow the steps in order and the resolution to yours could be down the page a bit. This isn't in the User guide.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01957673&cc=us&lc=en&dlc=en&product=3198308
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