my L297 L6203 doesnt work ?? :(

[lalaabdallah]

Hey everybody,im new member here in this great site,i became so interrested in the cnc field and after Effort of self- i understand how it works with these beautifull machines,idecieded to build my own router cnc 3axes using L297 L6203 chips (4A) for the motor driver ,and with easy interface (itook it from * Geoff Williams, "CNC Robotics: Build Your Own Workshop Bot"

my power is three pc power supply parallel connection In order to ensure 34V 7A
my motor bipolair NEMA23 4wires current per phase (3A 4,2V),impédance 1,4ohm

After i put my DB interface and the driver card under power (5V) i switch on for the 34V , iturned the variable résistance (2,2k) but nothing move i tested the step pin it was fixed on 3,87 V and the direction pin it was variable but around 2,2 V,i tested also the A- A+ ,B- B+ but its 0 volts.

Im not Professional in electronics i'm just Amateur and i need help because i spent money and time to realize my machine ,for more information in test points in my driver card im ready to do.

I feel upset after my Failure but i'm sure the professionals here will helps me

i attached the interface card and the driver card Schemes.

thx