Oiled the slider rods and ensure there was no debris or damage in the printhead path.
You may also want to check the quality of the encoder strip *CAREFUL! IT IS VERY SHARP* and the belt that moves the carriage.
The encoder strip can be cleaned CAREFULLY with a lint-free cloth wetted with clean, luke warm water. Also you should clean the contact matrixes of both the carriage (where the printheads are connected) and the back of the printheads itself. Use either clean water or isopropanol. If this doesn't do the trick, a maintenance kit may be the solution - as long as it still can be supplied.
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What solution are you seeking? They are not recognized by the printer and there is nothing you can do about it. You can try to get a refund (reimbursement) from the seller on the account of false compatibility claim.
Hello. The "Check Print Head Path" error is usually a worn out carriage belt on printers more than 5 years old. Open the top cover and examine the area under the belt and look for debris that looks like pencil erasure crumbs. Other possible problems could be the tube system catching on something as the carriage moves, the encoder strip being very dirty or extreme friction between the carriage bushings and the rails they move on. If the belt needs to be replaced, a replacement kit can be purchased at: http://www.lpscomputer.com/c-790-hp-designjet-belt-replacement-kits.aspx Hope this helps. Bob
And you won't.. Because there are none as this unit is considered too OLD. Try this "work around".
Download your XP driver you wish to install. If it's in a zip/rar file then extract it to your desktop.
You should have a simple .exe file sitting on your desktop to install the drivers, as normal for XP.
Right click the .exe file and select "Properties".
Then select the tab called "Compatibility"
Now check the box next to "Run this program in compatibility mode for:"
Make sure "Windows XP Service Pack 2" is highlighted.
Now apply the settings and run the installer.
This should work for most drivers, but not all