L7590 Black Print Missing tapes project and Normal but no better way

Problems with black project and print in normal mode for L7590 model CB821A.   After the printer has been turned off for about a month and then switched back, began to have horizontal bands across the exit who did not text/image, which should have been printed in black when printing in draft or Normal print quality.  Black okay impression is better quality.  "Logically the black output appears as if printed in approximately 7/8" wide sections/blocks on the page where the last 1/16 "(bottom) of each section is missing a release which should have been printed in black.  See assessment below one hatched filled printed image print black lines - i.e. the white strips between the blocks are portions of output that was not printed (but should be).  The problem occurs for the black out in draft or normal quality: the entire image without lack of bands is printed if black best quality mode is selected the problem appears only for ink black/output.  Output color (all three color cartridges) doesn't include any missing tapes for any mode of output quality (draft, normal or best).  Except where the output on the page aligns with the missing 1/16 "areas/bands, a diagnostic page is OK, print quality running print head alignment, calibration of jump line and cleaning of the printheads (several times) has no effect (fix) the printing problem.  Also to install a new Black XL cartridge does not change/fix anything.  Any idea on what to do to solve the problem?  Oh and also when making black copies of the production of documents in the printed copy of the document is lack as the black print in bands through the page at least that the best quality copy is selected.


Hi Sunshyn2005,

Thanks for the reply.  I had already seen and tried things in the link streaks of ink, fixing faded prints and other common print quality problems without any noticeable change in the sysmptoms of the problem.  Not knowing the logic of printing in detail the process, I was hesitant to assume that the problem was due to a print head (related as good) without knowing with certainty that if she could be the cause of the problem.  I had also seen the link following re manually cleaning/replacement of the print heads, etc. to:

""http://support.hp.com/us-en/document/c01446637 " "

Given no other definitive solutions, I pulled the Black/Yellow Printhead, cleaned the mechanical contacts (even if they appear dirty) and reinstalled print head.  After that hard restart of the process, the printing problem looked pretty much the same, but I used the printer console to clean the print head, align the print head and calibrated the line break.  Note that focus 3 on the print quality Diagnostics printout showed areas in white/white near the arrows, but unprinted areas also appeared on each 7/8 "in the set/bottom of the full page and calibrations of previous line break had not changed was not clear if the blank spaces seen were really due to power problems line.

In any case, I noticed in successive test prints, that no printed space has changed a little bit stable after things after replacing the print head and of cleaning and calibrate things.   After still print tests (change in volume of ink, paint, modes of quality, margins, etc) portions of unprinted line (~7/8' down the entire page) began to shrink.  After having used the services of printer to do about cleaning printhead plus 4-5, 3-4 alignments print head, line 11 or if several calibrations break line and a lot of printing of tests between the two, non-printed portions have been reduced in height for only the width of a couple very ink drops (project or normal mode; no unprinted areas in don't best way).

Thus even if the problem persists, it has been barely perceptible.  At this point, I'll just keep feeling and see if things eventually clear up all the way.  Maybe I'll try an inexpensive refurbished printhead later if things do not completely delete (to prove it fixed / improves things before buying a new expensive).  Note that at this point sight 3 to print the print quality Diagnostics always shows a notable, but very light gap point arrows (with a magnifying glass you can see it is not completely empty, but contains scattered points of ink and the gap is only a point or two high).

So... maybe the printing problem is actually "fixed" - at least it is enough now usable for the print project routine / normal for most cases.


Tags: HP Printers

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