What parts to bother desolder from circuit board

I've recently aquired one laser printer and one ink-jet printer/scanner that I decided to chop up for parts. Disassembling the printers was quite easy and so far I've collected:

1 DC motor 3 different stepper motors An assortment of springs, screws, cogs and belts. A couple IR-sensors (i think) 1 scanner head 1 laser + mirror 1 electro magnet 6 tactile pushbuttons

Theres also a couple of circuit boards with a alot of capacitors, resistors, USB-ports, relays and whatnot.

I've already tried to desolder some of the parts (the pushbuttons) but I quickly realized that it was quite hard to desolder. I know I wont be desoldering any resistors since they're to cheap to bother.

But are there any parts in particular that I should bothter trying to desolder? I'm new to electronics and well don't really know whats best for me ;)

If it has a nice beefy AC transformer you might scalp that out as making DC power supplies is pretty easy and something you might want to tackle as a learning project. I suspect the newer printers mostly use switching power supplies so there might not be a useful transformer to salvage.

Lefty

I have no idea as to what an switching power supply is (probably something I will read up on in the future though). But the Canon Laser printer did have a 220V mains directly connected to the printer. And a part of the circuit board is labeled transformer (secondary and primary).

You might find this thread useful if you are scavenging parts:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1236568653/0#0

And if you don't find that useful, then maybe this one: http://blog.makezine.com/archive/2007/01/heat_gun_desold.html

Best Of Luck Sam

Thanks, both links were quite useful.