Have you tried the "clean print head" option in the HP Officejet Pro software on your computer? This will often fix verticle lines. But, it will use a lot of ink.
SOURCE: when printing on my HP
The HP88 printhead can dry out and cause clogging in the black part of the K/Y (black/yellow) printhead.
This has been a major problem for a few client schools of mine and for me in my attic space where air conditioning and/or hot dry air causes clogging.
You may want to consider purchasing a new printhead and an alternative black ink supplier (non HP) that uses Dyebase ink instead of pigment as this doesn't clog in the same conditions.
However, please note that if you do this it means you may lose your warranty (certainly on the printhead) and the printout won't be as clear for text as the black ink can "bleed" slightly into other colours. It has however solve the problem of clogging in one school that went through 5 printheads in two terms/semesters until we switched.
SOURCE: I have an HP Officejet Pro 7580. When printing in
Press "set up" button until number 6
Number 6 is "tools"
press OK
press forward arrow (to right of ok button)
No.2 is clean printhead
No.3 is align printer
No.4 is calibrate line feed
SOURCE: HP Officejet Pro L7680 shows "Phone off hook"
The Phone line when they installed it for the fax was "Polorized" and once that was taken off it works fine.
SOURCE: i need help removing a paper jam in the document
Hi. here is the link to HP and what they recommend. I hope it solves your problem.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00839319&lc=en&cc=us&dlc=en&product=2512009
SOURCE: how to i wirelessly connect my laptop to my hp
Download the manual for the printer from here and check pages 100, 129, and 130
http://h10032.www1.hp.com/ctg/Manual/c00863866.pdf
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