Re: Hp 7475 Plotter Servo's

I have not tried changing the chips. I'll have a look at that,
maybe try and do some logic probe testing on them. I would like to
know what the problem is. Thanks

Victor A. Estes

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Hugh Prescott"
<hugh345@a...> wrote:

>
> 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@y...>
> 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@h...> 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@h...
> > ----- 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
> > >> >
> > >
> > >
> > >
> > >
> > > Addresses:
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there, for OT

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reach it if

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> >
> > 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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