Question about HP DesignJet 750c plus InkJet Printer

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Allignement error HP 750C

I have a problem with our HP 750C. The cartridges were empty, so I replaced them. Now I get a ´allignement error´ and ´-------> continue´ on the screen.
Can anyone help me.

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One or all of the cartriges is not working. If you press continue, and do a color cartrige alignment page again, you will see what cartrige is not working properly

Posted on Feb 06, 2009

  • Rick Chadwick Jul 28, 2011

    I also had this problem and spent many days looking for the fault until I finally found it. Before this I had replaced:

    The service station
    Head carriage unit
    ribbon cables

    To fix this problem perfom the following:

    Remove the Right hand control console cover.
    Remove the drop tank (2 screws hold this in place and a clip).
    Locate the main platen gear which is interlocked with a worm drive motor.
    There are two torx screws holding the gear to the platen and these will have come loose. Tighten them and secure them with threadlock.
    It might be a good time to clean out the drop tank (mine was half full!) and regrease the platen gear and worm drive.

    Hope this helps!


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Check with Island Inkjet or a similar ink provider. The ink must be the correct mix and density.
Ink must be refilled as soon as it runs out. Contact the ink supplier on how to transport empty cartidges. DO NOT ALLOW the unit to dry out. The cartridges are the print head. If the cartridge is out of ink AT ALL, it will clog. Clogged heads mean you need a brand new cartridge.
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Your carrage belt probably needs replacing. Try and lubricate the shaft slightly with a drop of sewing machine oil. Look around either end of the belt where it goes around the motor on left side and tension pulley on left side, do you see a lot of purpleish bits/dust. If you do then the belt needs replacing.

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This normally points to a worn ribbon on the carrage. Make sure the ribbon where the cartrige makes contact is really clean, if cleaning make sure the plotter is turned off. Sometimes a build up of ink can cause problems. The bad news is that if the ribbon on the carrage is worn it firstly comes with the carrage as a unit, and secondally the carrage is no longer available from HP

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I changed the black ink cartridge as per instructions and the printer printed an alignment paper which i then placed in the printer for alignment but the alignment failed

the page should be absolutely new.and the scanner glass should be absolutely cleaned.and 1 main thing u replaced your black cartridge.but if your colour cartridge is empty it will not accept the allignment complete will show allignment failed as the particular colour is missing in your allignment sheet which is required to get the allignment complete.

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You may be need to buy a new color cart., becuase the allignment page depend on the Yellow color when it become to scan..

or you can pring any allignment page from a friend and put it in the scanner instead that one you printed out....

Hope it's work

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