The printer back to normal

I took about 2-3 hours to figure out what exactly the problem to my false paper jam error. Then I borrow tools from my friend to dismantle all the component into pieces. With a little knowledge about printer, so I took a risk because I already fed up with the false paper jam error.

Before I unscrew the printer cover, I look at any possibilities a hidden screw so that I don't make damage on the printer. After that I open the cover then the component inside. I just follow my instinct when open it. I try my best to dismantle the component and remember every screw for each holes.