OfficeJet K550: Need key for the OfficeJet K550 Control Panel combinations

Hello!

I have an OfficeJet K550 - sustainable printer printer and it was, I had never (and I've had dozens of brands and sizes). It's been serve me flawlessly for years!

The problem is that the page "Troubleshooting print quality HP Officejet Pro K550 printer HP® Support issues" has disappeared from the HP Web site, it is similar to the following. And since HP Solution Center Software is not available for this printer, I can't clean the heads or carry out any other maintenance printer without the appropriate key combinations.

They were similar to the:

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