Trusty Samsung ML-2010 Printer no longer loading pages need help with

Hi. I love this old Samsung ML-2010 Printer. I’ve owned it for at least 12 years now and it has been great, however, it won’t print now. When it starts to load a sheet for printing, it halts right after the first load of the page, IOW, just before printing. I’ve tried a new cartridge with no luck.

I have torn it down and it is on my work bench 1/2 taken apart (the manufacturer page could have been better, I figured out how to tear it down, finally.

I cannot find what is wrong with it, how do I begin to figure out how to fix it, I really love this printer and want to get another 6 years out of it, I cannot afford a new Laser Printer.