I got hold of a couple of old HP printers and I’ve just started ripping them apart to get out the 3 motors. I’m assuming that they are all stepper motors. Two of them have 2 wire inputs; these were used for moving the head left and right and for pulling the paper through. The third motor has a 5 wire input and this appears to be used to bring the cleaning unit to the heads of the printer cartridges. I’ve not seen 2 wire steppers before but a quick google found some useful information about steppers (including a 2 wire setup).
Looking at the information (and from some reading of books!), it looks like I’ll need a Darlington transistor array like the ULN2003 or ULN2004 to drive the steppers. It also looks like they are all unipolar so I won’t need an H-Bridge like I would with bipolar steppers.
I need an even smaller Torx head now to get the last motor out. Size T10 for most of the screws but these must be size T5 !