Hello so this is my first post and I'm not really sure about how to go about this so bear with me. I am self taught and have been messing around with electro-mechanical systems since I could pick up a screw driver so I may be ignorant to some of the stuff I may need to know however, I have a set of boards that have everything I need to run two 5 phase (.72 / .36) including endstop and some kind of rotational homing setup. The motors I have are Berger lahr rdm 566/50 and 564/50. They came out of a few slm aminco uv/vis photospectrometer I think model dw2000, along with the drivers. They ran the pl600 (base unit of the assembly).

I have traced the traces and reviewed many datasheets for the ics. I get a bit confused about a couple of the logic bits. The problem I am having is finding a datasheets or service manual on the board itself. I've found what I believe to be two pins for selecting the stepper to drive, one step pin, one labeled u/d I assume is a direction pin, and a completely unidentified pin.

I have connected an Arduino nano and tried to use the unidentified pin as both a step enable pin and half step enable pin. I may be totally off on that and I was thinking it may be an oscillation signal that drove the step incrementation but im not so sure so I'm here. My results none the less for everything I did ended up being the motor I chose would go stiff and wouldn't take a step in either direction.

The board highlights might be its a two sided none multilayered board from the 1980s, mosfet h bridge style driver with a driving circuit, nothing else on board other than a 12 and 5 volt regulator circuit.
Components on board.
3X 74ls04n (hex inverter)
22X mje6044* (npn mosfet)**
2X n82s23n (256-bit ttl bipolar prom)
5X 75451n (duel hs/hc peripheral drivers)
1X sn74ls221n (monostable multivibrator)
1X 74ls00n (quad nand gate)
2X mc14510b (unsure, cmos presettable up/down counter)

* The other two boards use 2n6039s, otherwise they are the same.
** 2 mosfets drive a set of fans I believe

Any help would be appreciated, I've done what I know how to do and not sure where to go from here so thanks in advance.

 

Here is a little info
https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwi_wrDrl-fbAhWqwFkKHe74DkEQ5TV6BAgBEAs&url=https://forum.strojirenstvi.cz/download/file.php?id=24637&psig=AOvVaw0YvDCFAdsMGAAK9EY4nYC-&ust=1529753887841517

That looks like more hassle than it is worth.

 

@ DNA Robotics, I agree. Those 5 phase steppers were never that popular, and have pretty much died out since they started making "hybrid" steppers. The 5PH were a way to keep a position when not stepping, something the 2 phase hybrid motor does much simpler.

 

MC14510B BCD Up/Down Counter
http://www.datasheetlib.com/datasheet/271286/mc14510b_motorola-semiconductor.html#datasheet

I think I would power up the board and send pulses to the #15 clock pin on the MC14510B and see what happens. Cut the PCB trace to that pin if you have to.
If that works, you can set the # 10 up/down pin to change directions.

Another way would be to tie A, C, E, G & J to +12 volts and use logic level N MOSFETs on B, D, F, H & K and let your Arduino run it like a unipolar stepper. Then output a pattern like
10000
01000
00100
00010
00001 etc.

It might be tricky figuring out the sequence and polarities if the wires are not labeled.

 

See I've considered running the motor from the fets like a unipolar but the driver is complete and all on one boards plus they fit in the enclosure I want to use for the electronics. I do have a few 12 volt unipolars I'm using for a small pcb mill. I've just got 10 of these motors and three drivers that can run two motors and very little extra cash. I plan on using them on a high res 3d printer that's 3'x3'x3'. It'll be a slow printer but I'm not worried about that. The logic input scheme seems the same or similar to an easydriver, again I'm just having interfacing issues. I'll include a couple pictures of the unit. In the image of the back of the unit the gray wire and black red and white wires are all pinouts going to my nano.