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Solid black in a copy typically means that the scanner is partially blocked. Open the top, where you'd place a sheet to be copied, and examine the small strip that runs down the side (left, most likely). See if it's clear, or if something is covering part of it.
Most copiers don't use the full size scanning plate for copies, but use a strip that scans the paper as it moves across it. If something blocks part of it, you get the black area.
The only solution I have found to that problem was to get a new printer. You can try cleaning the heads and make sure you are using the right ink cartridge refills (some of the off brands will leak ink and totally mess up your printer). I would contact the manufacturer to see what they say.
the toners are rated for a certain number of pages based on 15% coverage on the page. print a supplies usage page from the control panel on printer if available to show you how many pages you printer and what the coverage was.
calibration does use ink, but should not be that much.
If you are using non-HP toner, this may be why you don't full life out of them. Try HP toners and see if problem remains.
NOTE: The problem occurs because of the trickle development system in the machine, making extended lengths of black and white copies / prints does not allow the black developer housing to purge itself of excess waste Toner (Dry Ink) and Developer. There are two solutions for the problem:
Make 1,000 copies / prints of a black and white job, then make 150 copies / prints of full color. Continue making 1,000 copies / prints of the black and white job, then 150 full color, and so on, until the entire black and white job is complete.
Make extended jobs in groups of 100 by making 100 copies / prints of the black and white job, then allowing the machine to cycle down (return to 'Ready') and making the next 100 copies / prints. Continue in this pattern until the entire black and white job is complete.
NOTE: The above solutions are based on jobs using 8.5 x 11 inch paper, single sided, with no more than 28% coverage.