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SUGAR131
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HP Recommended
hp3520
Chrome OS

I have done everything suggested as far as cleaning, changing ink (it is full). The color cartridges print fine.

I even took it apart and soaked it..lots of nasty yuck came out but still not printing black.

I saw where someone change something to gray or took the grey away, but I could not figure out what they were talking about or what they did. Anyone know what that is and have any other seuggestions?

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