Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

Just a thought

Have you tried changing the 1489, 1488, 751XX RS-232 interface chips that
service the serial port.

Could also be the 40 pin UART chip.

They might have been damaged by static / misswired cable etc. These two
chips are the connection to the outside world from the plotter.

The chip numbers listed above are from the schematic for my HP 7585B plotter
probably common to all HP plotters of that era.

Sounds like scope and logic probe time.

Hugh

----- Original Message -----
From: "Russ Waters" <mycncworld@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, October 20, 2005 11:51 AM
Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's


> Hi... I just seen your post, and if it helps, it is a "null" cable that
you will need. I have on that I used to use to plot my drawings, but now is
just collecting dust on the shelf! I do have manuals and if you need any
specific information, just let me know and I will do my best to pass them
on.
>
> Russ
>
> "Victor A. Estes" <emc3zach@...> wrote:
> Alan (KM6VV), Tom H., Dave M., and anyone else I may have missed,
>
> First off, thanks for all of the help in trying to solve my plotter
> problem. I still have not been able to get it to respond to any commands
> from the computer in DOS, or Basic, or Windows. Even though the plotter
> will power up and perform it's demo plot with no problem. And still have
> the blinking error light that will not reset. The manual talks about
> getting error information from the plotter using ESC commands, but I have
> not been able to figure that one out. It says that ESC.E should report
back
> what the error is causing the blinking light. But I am too inept to get it
> to work I guess.
>
> So will keep trying and probably scrap it for the servo's for a future
> eggbot project. In the meantime I picked up several steppers that I will
> initially use in my eggbot project. Vinyl cutting will have to come later,
> or use the cutter on my mill.
>
> Which brings me to the cutter. I have pics and a description of the
> cutter for you guy's and anyone else who would like to see it. But as luck
> would have it, I wanted to upload the photo's on the group site, but I
> cannot find a link to create an album and upload the photo's. So if
someone
> would tell me how to do it I will, or provide your direct email addresses
> and I will email to you directly.
>
> I would like to see if this cutter works, there is no reason that it
> should not, but it still would be nice to see it actually work.
>
> Let me know guys, and sorry about the delay, I am also a procrastinator.
>
> Sincerely,
>
> Victor A. Estes
> emc3zach@...
> ----- Original Message -----
> From: "Alan Marconett"
> To:
> Sent: Thursday, September 29, 2005 10:30 AM
> Subject: RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
>
> > Hi Vector,
> >
> > It could very well be a NULL modem cable that's required. I was hoping
to
> > find my manual last night, but failed.
> >
> > I still have it cabled up to one of my older computers and a serial
> > switch,
> > so that would be a way to verify what is needed. And the dip switches
> > will
> > be set up, probably 9600 baud for me.
> >
> > If the LED is blinking, then it didn't like one of your commands. You
> > might
> > route the plot commands to a file (still 7475 format), and see what they
> > look like. First char for initialization is an ESC (which doesn't print
> > very well in a text file), then two more characters, like I copied in my
> > email. Then possibly one or two more initialization codes, and then plot
> > commands.
> >
> > From DOS, you can "copy" a valid PLT file to the plotter, and that is a
> > basic test. Baud rate must be set up, of course.
> >
> > I'd be curious how you made a drag cutter out of a 7475 pen.
> >
> > Alan KM6VV
> >
> >
> >> -----Original Message-----
> >> From: CAD_CAM_EDM_DRO@yahoogroups.com
> >> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Victor A. Estes
> >> Sent: Thursday, September 29, 2005 6:20 AM
> >> To: CAD_CAM_EDM_DRO@yahoogroups.com
> >> Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
> >>
> >> Alan,
> >>
> >> According to everything I have read on the plotter a NULL Modem cable
> >> is
> >> required. So I went out and bought a new serial cable with a null modem
> >> adaptor. Still does not work. This was after I tried making my own
> >> cable
> >> based on the pin outs that I had read would work, no joy. I set the
baud
> >> rate, parity, stop bits, and everything on the dip switches just as I
had
> >> read was the thing to do from several different web sites on turning a
> >> 7475
> >> into a vinyl cutter. I'm running windows xp and the driver for it is a
> >> HPGL/2 driver which I understand will not work. Has to be a straight
> >> HPGL
> >> driver, windows 3.1, 95, and 98 have it. But I thought I would try
> >> anyway
> >> to see if I could get any response fro the plotter. When I failed to
get
> >> it
> >> to respond out of windows xp I switch to the DOS window and tried to
the
> >> direct commands by activating the COM1 port, still no joy. So I am
still
> >> at
> >> a loss here. In my original post I did not mention that I made a real
> >> neat
> >> drag knife holder for the plotter out of one of the original pins. I
> >> want
> >> to try vinyl cutting with it. If I cannot get that to work then I want
> >> to
> >> take it apart and make the eggbot.
> >>
> >> Victor
> >> ----- Original Message -----
> >> From: "Alan Marconett"
> >> To:
> >> Sent: Wednesday, September 28, 2005 6:01 PM
> >> Subject: RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
> >>
> >>
> >> > Hi Victor,
> >> >
> >> > Are you sure a NULL MODEM cable is required? I have a 7475A plotter.
> >> > I
> >> > probably haven't plotted with it for 10 years. There is also a switch
> >> for
> >> > baud rate, as I recall. Insure that you are talking the proper baud
> >> rate,
> >> > parity, stop bits, etc. (which I'm sure you've already checked).
> >> >
> >> > I wouldn't mind finding a 7475 plotter that I could experiment with
as
> >> you
> >> > describe! I even started an EGGBOT project a few years ago.
> >> >
> >> > Alan KM6VV
> >> >
> >
> >
> >
> >
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sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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