Re: Hp 7475 Plotter Servo's

Test page ?

I offered that checking for the 'simple' mechanical things. "Bug" is
supposed to be from an actual inset shorting on a PC board....

dust can invalidate a switch and so on.

But.... if you can print a test page, then you should safely assume
that things like paper out and pen open are working.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "caedave" <caedave@b...> wrote:
> You can't as such, it's a case of find the fault, correct it and
> the error goes away.
>
> Unfortunately I/O errors can be a nightmare to fix.
>
> Turbo's (the other Dave) message has some pointers but
> start out by checking the pin outs and Dip settings, if they
> are correct then it's time to get the meter and scope out
> so you can check continuity, pulse timings and levels.
>
> Try to also check these within the plotter so that you know
> the plugs are making good connections (been caught by this).
>
> Make up a plug with the correct crossover connections for
> the comms status. With this plugged into the plotter if you
> still get the error then at least you know the fault is something
> to do with the plotter.
>
> Dave M.
>
> ----- Original Message -----
> From: "Victor A. Estes" <emc3zach@h...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Sunday, October 02, 2005 7:47 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
>
> > Dave,
> > Thanks, it's has to be the I/O error. Any idea how to reset a I/O
error.
> >
> > Victor
> >
> >
> >>From: "caedave" <caedave@b...>
> >>Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
> >>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >>Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
> >>Date: Fri, 30 Sep 2005 12:01:18 +0100
> >>
> >>Took a look on HP's site (Not the best to navigate around) and
> >>did eventually find some info on the 7475's including full pin out
> >>listings, Dip switch positions, test procedures and setting up.
> >>
> >>Limited amount on the error codes (lights) listed below.
> >>
> >>1. Error light dim, slow blink :-
> >> Plotter not active but performing power management.
> >>
> >>2. Error light on steady :-
> >> View Button pressed or plotter in paper load mode
> >> (Pinch wheel lever Up)
> >>
> >>3. Error Light fast blink :-
> >> I/O error, Paper jamb error, HP-GL error.
> >> For these it then references certain sections of the manual.
> >>
> >>Dave M.
> >>
> >>----- Original Message -----
> >>From: "Tom Harrison" <TomH-CNC@T...>
> >>Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
> >>
> >>
> >> > Don't forget: It also flips data receive and transmit (pins 2
and 3).
> >> >
> >> > Try this: using a digital voltmeter, measure the voltage at
pins 2 and
> >> > 3
> >> > using pin 7 as a reference. The one with an active negative voltage
> >> > (between -5 and -15 volts) is the pin the device is using to
send data
> >>out
> >> > to the world. On your plotter and on your computer (use a 9-pin to
> >>25-pin
> >> > convertor if necessary), they must be on different pins to
communicate.
> >> > Then apply jumpering if necessary, to satisfy the RTS/CTS and
> >>DSR/DTR/DCD
> >> > requirements of each end.
> >> >
> >> > Realize also that some interfaces actually USE the other control
> >> > signals
> >> > to
> >> > throttle data flow so as to not overwhelm buffers. Not all use the
> >> > character-based throttling, like XON/XOFF and the like.
> >> >
> >> > More details if you need....
> >> >
> >> > Tom Harrison
> >>
> >>
> >>
> >>--
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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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