HP Designjet T520 plotter with the display stating "There is a problem with the printer or ink system, turn off, then on, if problem persists contact HP"
This fault is usually down to either a faulty cartridge or a faulty printhead assembly, start by taking the ink cartridges out and visually inspecting them, power down the printer and one by one insert the cartridges to see if you can see which is potentially faulty, if none of the cartridges are faulty the chances are the printhead is the issue, the HP printhead replacement kit part number is HP711 (C1Q10A) these should be around £125 plus vat (Jan 2020) full instructions will come with the replacement printhead kit.
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Black ink cartirdge faulty can also be displayed
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