I have separately emailed this problem to the support email address, but am posting here as well in the hopes that somebody may be able to offer some insight.
I have a 2133 stepper carrier, but only one driver seems to be working.
It seems the B1/B2 pair is faulty. With no motor attached, they show alternate “logic” levels (as they should - one at 12V [Vmot], the other at 0V). However, with the motor connected (coil resistance tested correct) the one is pulled to the level of the other (While A1/A2 manage to hold their levels). When stepping the motor, the motor simply bounces back on forth when A1/A2 reverse polarity, but do nothing when B1/B2 change.
Has anyone seen this before?
Any assistance/suggestions appreciated.
Edit: I leave this here as a warning to others, but the mods are welcome to delete this thread if they like.
Before posting, I did try resoldering the pins, but obviously there was still some problem. I expect a high impedance to the adjacent ground pin.
I since completely redid all three pins and the driver is working as expected.