More precisely, he knows what an item does, but not the why or how. This leaves him to make some insane leaps in logic to fill in the gaps of what he knows, particularly for more modern stuff.
Ahhh, I see. Just put this like so and do that, and...That's Rinnosuke-san for you!!!I couldn't figure out that machine for an hour. How could he fix it in minutes...?I don't believe it...HoistChnk KchakThere, fixed.Right, pardon me.BeepVrriiinnnZhwrrrrrWhewWhat did you say!!?Thank you so much!Kapa!!?What are you doing!!?Aw, shucks.