Question about HP OfficeJet Pro k550 Printer

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K550 air in ink feedlines

Air in all feedlines
one or more colors not printing at all or light print or one or more colors with streaks. I will run several printhead clean cycles and heads will start to print correctly. I will print several pages of mixed text and graphics and the problem will repeat. printhead health will change to fair on one or both printheads. KY printhead New, MC printhead used,
Ink Levels K 95%, Y 54%, M 76%, C 71%, Genuine HP Ink 88XL cartridges, from Sam's club less than 2 weeks old. Page counts as follows Tray 1 = 144, tray 2 = 699, Auto duplex = 28 total = 871.
Printhead expiration date: KY 11-26-2009, MC 4-23-2010 Ink Expiration: Bkack: 6-4-2011, Y-C-M all 7-2-2011, after several cleaning passes one or both printhead helth may return to good.

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  • Carl2020 Jan 23, 2009

    Prblem found. Ink station improperly installed (at factory?) Needles not going fully into ink cartridges so that sometimes they would pickup ink and sometimes air. Thanks for the help

  • Anonymous Apr 06, 2009

    No color prints and the black is very light. I inherited the printer so it wasn't used for 3 months, but have since replaced all cartriges and need to know how to fix.

    Thanks,
    Bruce

  • Martin Smallridge
    Martin Smallridge May 11, 2010

    The K550 is essentially a continuous ink supply (or CIS) system built into a printer and as such it's prone to the same kinds of issues.

    The black is particularly prone to issues with clogging in dry, hot environments because it's a pigment ink (which tends to clog quicker than the other dyebase inks) but your problem doesn't bear the hall marks of that issue.

    It sounds more like there is either an air leak in the system or a problem with the cleaning system. The confusing symptom is that more than one ink is being affected which is unusual.

    Could you be more specific as to which colours are being affected and if possible provide some images/scans of the sort of streaking you're seeing.


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I have had this happen a couple of times and have cured it easily. It has only happened with the black with me. It seems to be caused by air in the ink feed line. With the printer switched on open the top cover and hold the resume button for 5 seconds. The printheads should move to the left and you may be able to see air in the pipe(s). Remove the printhead of the offending colour(s) then insert a syringe with the plunger fully down into the rubber that the printhead connects to. Draw up the syringe plunger to draw ink/air through until you can see no more air in the pipe. Replace the printhead and close the cover. The printer should now do a calibration with the offending colour hopefully now working.

Posted on Mar 29, 2009

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Not sure what to do in a situation like this but I'll post this as a solution as we seem to have found it even if I didn't actually realise it was... Who knew :)

Posted on Jan 23, 2009

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