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The bad news is that this seems to be a fatal error of the main board. The only time I have had a similar error is when the carrage motor shorted out and blew the main board. This probably did not happen in your case but something appears to have taken the board out. The main board is speculation, but I think I am correct, sorry, Dave
Your plotter driver needs to be set to either black or greyscale. The driver will overide the settings on the plotter unless you set up the plotter in manual. ie the pen thicknesses, colour etc are set in the control panel to manual. The driver takes priority always.
Look under the plotter on the control panel side. You will see a sensor with two wires comming out. This sensor is dirty. You can try and blow it clean (often works) or remove it and clean with a small brush. It clips in and out but be careful and take note of the clips etc remove it without breaking any.
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
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!