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HP T1530 plotter, THAT GIVES ME 79:04 ERROR after printing a few pages in addition to that it gives a line of Ink on page
I've installed a new print head after updating the firmware. and I'm still getting the same error with the ink on the page. Can you advise the way forward? Thanks 
 
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Do you mean a clearly defined line or a splotch of ink?

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It is a clearly defined line. 

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