HP OfficeJet 8013 Black Printing Problem & Fixes

--- For OfficeJet 8013 when using a subscription, original standard (OEM) or 3rd party / aftermarket ink (i.e. degraded printing, or printing including print like or missing black then it is first suggested to activate the 8013 (printer&command from the printer’s menu. You may need to perform this action twice to help recover the printer. If this does not correct the print quality then it is suggested to remove the HP 916XL black cartridge (and/or all 4 cartridges from the carriage. You will want to inspect the suspect cartridge for leaks and then re-install, verifying all cartridges properly lock into carriage assembly. If an quality issue persists then it is suggested to print a heavy colored or to see if ink can be blown thru the internal printhead, and hopefully resume normal printing. Depending on which color is missing, create a document with either 100% black color blocks (or 100% Cyan, Magenta or Yellow color blocks for color / colour related issues). Print the document 2-3 times back-to-back and check for normal print output. If each subsequent print starts to look better (i.e. text becomes visible on page) then the internal printhead may be slowly recovering. However, if black/color (or is not printing, such as the black ink, then the bottom of the PRINTHEAD may be clogged with dried or built up ink. It is suggested to open the printer and remove all 4 cartridges from the carriage assembly. Obtain several paper towels and fold 3 or 4 times, dampen with water.