HP Officejet Pro 8620: Ultimately unusable

Why To Buy such a device? Because it sends it to the duplex ADF value, otherwise the ~ 30% cheaper little brother would also suffice. Or any other low-cost printers.
It is this duplex ADF but does not work or is not real integrated in the device software.
If you scan multiple-sided originals so the scanner can Ettlich pages away easily. In the resulting file - for example, a PDF - is every other page on the head, and reproducibly. And so also the originals in the chute find: Every second page is the back up and additionally the side located on the head. Since at least not boring if you only must reorder the originals after the scan again wirds one.
When copying - which actually only is indeed a scan with immediate expression - the result looks a bit different ... but unfortunately nothing better. The printer omitted to put on pages upside down. But he can always back out of pages. So it is then, for example, that the front of the original sheet 2 adorns the front of a copy on the back of that copy, but the front of the original sheet 3 is printed ... totally exciting new combinations arise that way.

I asked in the HP forum for a solution and only the default response 'Firmware Update or sending' get only was unfortunately the latest version of it.
Mag therefore be that it is a mechanical problem. Only to buy a printer to out-of-box tuned to the same must rumdoktern. Since then already ask questions: Quality Control? Constructive quality / error? Longevity? Complaints about the ADF can be found here plenty of them.

Now why only one star? A printer for> 200EUR actually prints one may assume, that should be not worth mentioning, which can also be much cheaper copies.
He brags about the term 'Office' and can pay themselves a duplex ADF addition. But this does not work exactly the printer has ultimately no raison d'être.