I've been searching for hours now and can't find the answer to this. I serviced this printer (replaced the fuser) because the screen said 'Maintenance'. According to the instructions that came with it, you're supposed to hold down 'Select' and 'Return' as you power it up, then press 'Go' and a Config Menu is supposed to appear. However, when holding down those two and powering it up, it prints out the 'Print Quality Test' pages that consists of 3 pages (printer info page with settings and any error codes, a grayscale page, and a solid black page). I found this:
Which is helpful, except that when I hold down 'Go' and 'Stop' it locks the menus and I can't get into anything. When I press either menu button, I get 'Menus Disabled'. Then, if I try it again, it unlocks the menu, but I still don't get any Config Menu to clear out the maintenance Count.
Any help is greatly appreciated.