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The HP Officejet Pro 8600 Plus is identifiable by its model number: N911g. Released in 2011, the printer can be identified by its brown finish and touchscreen control panel.

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Print quality is light and with horizontal lines

Printing is light in all colors and has horizontal lines through all print

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Most likely a Bad/Clogged print head. There should be a Clean Nozzle / Print Head option under Settings - Tools.

Try that, there should also be an option for align print head. If Neither of those work the print heads are too badly clogged or have failed completely. You can try cleaning the print heads out with isopropyl alcohol too. There is a good video Here.

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