Re: [CAD_CAM_EDM_DRO] SI-7300A or SLA7024M CIRCUITS

Hi Alan,

Thanks for replying to my message.

The SI-7300a in the HP LJ2 is conatined within a
module that plugs into a main board. Unfortunately I
have been unable to get the data for this chip as its
probably obsolete now so I can not track the leads
thru to see where they go.

The Fujitsu printer has several surface mount ICs on
satellite board connected to the main board which I am
unable to identify.

Both driver boards to these units contain the ICs I
listed as well as power supplies but both are switch
mode and I am reluctant to fiddle with these as they
would be at line potential. I would prefer to be able
to isolate the PS from the drivers for safe operation.

Thanks again.
Tad.
--- Alan Marconett KM6VV <KM6VV@...> wrote: > Hi
Tad,

>
> The chips are ALREADY in driver circuits! And a
> power supply along with
> them! Why not just interface at the 4-phase lines
> coming from the
> processor, and driver 'em that way?
>
> Alan KM6VV
>
> tad borowiecki 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.
> >
>
>
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