03-13-2014 07:11 AM
Welcome to the HP Support forums. I understand that you are getting black vertical lines on your printed documents.
I’ve included the trouble shooting document titled Fixing Ink Streaks, Faded Prints, and Other Common Print Quality Problems. Please choose your operating system and follow the steps. If you are using Mac OS X 10.9 Mavericks please follow the steps for Mac OS X v10.6, v10.7, and v10.8.
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I work on behalf of HP