[Coco] Cross Post from the Facebook Page about the RGB2VGA Board

[John B]

That makes sense.  I am on a much smaller scale.  LOL  Where do you get
your solder from?  Could you send me a link to what you use?

On Fri, Jul 10, 2015 at 11:27 PM, Zippster <zippster278 at gmail.com> wrote:

> If you were applying it a little at a time I guess I could see that,
> but submerging boards in an inch or two of iso works perfectly for me.
> I do go through a lot, but it’s cheap.
>
> I use a high rosin flux leaded solder (3.3% flux) as well as plenty of
> Amtech 4300 (syringes) when called for, so the boards are well fluxed when
> finished.  :)
>
> I’m doing tens or dozens of boards at a time, so a plastic bin and a
> serious bath is my method.
>
> - Ed
>
>
> > On Jul 10, 2015, at 10:11 PM, John B <trymyz at gmail.com> wrote:
> >
> > Ed,
> >
> > I have some flux and electronics cleaner I use.  Alcohol works good but
> > takes way to much to clean rosin flux.  Even my flux cleaner takes some
> > effort.  Its the cheap stuff from the local electronics store.  I should
> > probably invest in the more expensive flux cleaner.
> >
> > On Fri, Jul 10, 2015 at 11:05 PM, Zippster <zippster278 at gmail.com>
> wrote:
> >
> >> I’m following this thread with interest, as I’m going to be finishing up
> >> theRGB2VGA boards that people had ordered from Kip
> >> to get that project successfully completed.
> >>
> >> It is true that different monitors are more or less tolerant to certain
> >> differences in signals, that could explain
> >> some of what is being seen here.
> >>
> >> Regarding cleaning boards, 91% isopropyl alcohol works wonderfully.
> What
> >> I do is submerge the boards in the iso in a small
> >> tupperware type container, soak for 10 minutes or so, brush them with a
> >> toothbrush while in the bath, then rinse with fresh iso and air dry.
> >> Be sure to use the 91%, the lower concentrations have too much water in
> >> them.  It’s available at drug stores, walmart, etc.
> >>
> >> - Ed
> >>
> >>
> >>> On Jul 10, 2015, at 9:39 PM, Steve Batson <steve at batsonphotography.com
> >
> >> wrote:
> >>>
> >>> John,
> >>>
> >>> Have you changed the resistors yet, or are you using the resistors
> >> recommended for the design? I was seeing jitter, where the entire screen
> >> would jerk and occasional waves going through it mostly noticeable on
> the
> >> edges. Also, it didn't seem consistent, sometimes it was worse than
> others.
> >> Based on what Roger had found, it sounded like there were a number of
> >> issues being caused by the original resistor values. Voltage Levels were
> >> not what they should be. Also there was issues with the HSYNC and VSYNC
> >> again caused by original resistor values. Luis and posted on the FB
> page a
> >> response to one of my questions that some CoCo's are noisier than others
> >> and this may very well be true, but I'd guess symptoms could be worse on
> >> some systems then others which could be the combination of the CoCo and
> >> Monitor. From discussions with Roger about this and how he fixed it, I'm
> >> going to go out on a limb here and suggest that with his suggested
> resistor
> >> values, the video will most likely be crisp, clean and jitter free on
> most
> >> any CoCo and VGA monitor unless they have problems of their own.
> >>>
> >>> It was a bit of a pain in the butt pulling a bunch of resistors out and
> >> replacing them with Rogers suggested values, but I'd highly recommend
> it if
> >> you haven't done so already. It was totally worth it! If you have
> already
> >> replaced the resistors with the new values and are still having issues,
> I'd
> >> suggest the following:
> >>>
> >>> 1) Inspect your board and make sure you have no possible shorts. Clean
> >> it real good with alcohol or other good electronic board cleaner and
> >> thoroughly dry.
> >>> 2) Check all the cables including power going to the board and make
> sure
> >> all is well
> >>> 3) Make sure the ribbon cable isn't right next to a transformer
> >> including the CoCo power power supply (thought I am not having issues
> even
> >> if set the board right on top of the CoCo above the transformer). This
> >> probably is NOT an issue.
> >>> 4) Remove wire I mentioned that was a ground fix.
> >>>
> >>> Anyway, let me know if you have changed the resistors yet or not. I'm
> >> very curious to see where you are at.
> >>>
> >>>
> >>
> >>
> >> --
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> >> Coco at maltedmedia.com
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> >>
> >
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>
>
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