Jumper the P3 (sync), K1 pins 2 and 3 (max), and K2 pins 2 and 3 (min) connections. I am pretty sure this is mentioned in the instructions. If not, it should be!
OK:
> Use a couple of jumpers to short the left-hand pairs of
> pins of "Max" and "Min", as in the picture.
is definitely there in the Wiki. [
www.reprap.org]
However, I didn't say "and short P3" in my quick note on this added a few days ago, and I probably should have. There's no value in adding P3 before testing if you don't use it for anything during testing (!), but that's not at all "obvious" unless you understand what is going on with the electronics fairly well already :-)
I'll edit the Wiki to add "and short P3".
Thanks,
Jonathan