stuck

Accidentally pushed the drum-tray back in without the drum? The green light won't show, and the tray won't budge - all you need to do is to carefully push a tiny lever below the tray, as pictured. 

good luck

What to do if you have drum stuck in your RP 3700 that is not in the right position.

Original article: http://www.drucksalon.ch/828/how-to-remove-a-stuck-drum-from-a-riso-rp-3...