TL DR for C3180, 'scan' = 'start copy black' (presumably only when you change the black cartridge). I suggest if you are reading this that you copy and save the information, as I arrived at it by trial and error and cannot find it anywhere else on the web. Why couldn't that video go on for a further 20 seconds and actually finish the process?

The official HP video at on how to change the cartridge scores a brilliant own-goal by stopping just short of revealing the dread secret of how to scan the alignment page. Start copy black ( this is the scan button).Start scanning / reprints (doesn't work as scan button).On the top, from front to rear the buttons are:

On the front it has a button marked Photosmart Express and another with what looks like a telephone keypad. Except that the C3180 does not have a scan button. This is the advice that is given in answer to the question: you must let the test page be printed, then put the test page on the scanner and press the Scan button.

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