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[on:]

I have a MITSUMI  M35SP-9P stepper motor which I salvaged from a printer. It has 4 wires so I assumed it was a bipolar motor.
I connected it to the arduino using a SN754410 driver board, loaded up a bit of code to run it and all I got was a few jitters.
So off to Google where I found a datasheet for it at  http://www.mitsumi.co.jp/latest/Catalog/compo/motor/m35sp9_e.html.
This describes the Excitation Method as a 2-2 Phase excitation (Unipolar driving) but no pinout. I have been searching all over Google but cannot find any clues at all.
So does anybody have any idea on how to connect this motor up?

[Reply #1 on:]

loaded up a bit of code to run it and all I got was a few jitters.

There are normally two reasons for this:-
1) You are trying to step it too fast - try slowing it down.
2) You have the coils connected in the wrong phase. Try swapping the winding of one coil.