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HP 7780 suddenly stopped printing in red. I have changed the cartridges several times. I am using brand new HP cartridges. Have cleaned the print heads, aligned several times, nothing has heled. The printer sometimes will initially print just a little red and then fades to nothing. The printer also stopped scanning to the computer despite reinstallation of the software again, several times.

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Hi Good day!!!
Maybe your print head is clooged (red)
Then most about 98% are more likely to be an ink clog which just needs to be unclogged using something like print head cleaning solution
Basically, if a print head has been left unused for some time... moisture inside the ink begins to evaporate and instead of liquid ink, a thick inky jelly begins to form inside the print head.

When this occurs white lines appear in prints and most people not realizing the problem, will replace their inks... But when that does not work. Some assume they have an electrical fault, and replace their print head, others will replace their printer !

But provided there is no obvious print head damage? In 98% of cases it simply needs a little patience and print head cleaning solution injecting directly into the print head to dissolve the dried ink trapped inside. This will dissolve the clog and allow your expensive ink to flow once again. Most will then print as new.

Thank you for using fixya

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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