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Pull out the cartridges, turn the plotter on and install the ink cartridges one at a time - making sure each one is recognized. One of them may have gotten a power surge and had the electronics burned out - - replace that cartridge with a new one.
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. See about one set of spare print cartridges so they can be rotated.
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.
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
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 thing.it will show allignment failed as the particular colour is missing in your allignment sheet which is required to get the allignment complete.
HP 750C Black cartridge quit in the middle of plotting chart. Replaced black cartridge & does not make contact with something. Cleaned contacts, turned off plotter, disconneted cables, reconnected & turned back on. Still says that black cartridge is missing. HELP!