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

Hi Tad,

I'm attaching a PDF data sheet for the SI7300A chip (attachments won't
show up on the list).

Do some searching on this site, I believe I found some doc's for my HP's
here.

http://www.hp.com/cposupport/nonjsnav/ljpr.html

Alan KM6VV


tad borowiecki wrote:

>
> 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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