Re: SI-7300A or SLA7024M CIRCUITS

--- In CAD_CAM_EDM_DRO@yahoogroups.com, tad borowiecki
<t_bendigo@y...> wrote:

> HI,
> I have obtained some stepper control chips off HP
> laserjet 2 and a Fujistu printers. Both chips look
> quite capable of handling a reasonable amount of
> current.
>
> Has anyone had a go at using either of these to create
> a stepper motor driver circuit. It seems a shame not
> to make use of these bits as the motors they control
> are worth trying in a mill.
>
> Thanks.
>
> Tad.

have you been in my basement ? I got a round NEMA23, double stack
from a HPLJ2 last week. only problem is that the shaft has direct cut
spiral gears.

I too saved the chips as it appears the two driver boards from the
printer are ready to go ! just hack step and direction and power and
you're off to the races.

One board is all driver chip with a couple (3) ribbon connectors, but
there are only 7 lines to the 24M side of the board. plus the 6 out
for the uni-polar motor, and 4 in that I think are end switches.

so, 2 for power, 2 for step and direction, that leaves 3 unknowns.


me, I wanna figure out how to use the LCD, that is a nice unit as
well.


Dave