This next part will deal with firmware updates, Microsoft, Adobe, and PDF files. I would strongly recommend updating firmware on any printer or device released post 2012, especially devices purchased after 2015. There has been a large number of firmware releases relating to things like engine adjustments, security protocols, and the way pdf files are printed. If you have any end users that are complaining about PDF files taking too long to print, long pauses between pages, or not printing at all, here are some recent solutions that I have discovered. One common problem I have seen is with Windows 10. It will change your default PDF reader from whatever program you have selected, to use Microsoft edge instead. As it stands now, some computers are not able to print PDF's from Microsoft Edge. This will result in the PDF file failing to print and just disappearing with nothing printed, or a corrupt print job will be generating a 49 error and a failed print job that can block the print que and prevent other jobs from being sent. The fix is to just change your default PDF viewer back to something like Adobe DC Reader.