RE: 6100 Wavey Letters

Ripple refers to poorly filtered liner (or maybe some switching) power
supplies. Often the result of either bad primary filter caps OR bad ground
connections it shows up on raster games as a black bar moving across the
screen, and on Vector games as ripple in the image. There are several
supplies on vector games that need to be checked, the +5VDC, and the
secondary +15 and -15VDC supplies for the op-amps and DACs. Best examined
with a scope, and I like to hook a single ground wire from the scope to the
monitor chassis when on a ripple hunt. This will show you signals relative
to the monitor and as such should give you a good idea about sources of
ripple. On any of the regulated supplies there should be 0.00VAC ripple on
the regulated output. Almost any 'scope will do for these tests, and you
can also monitor the HV output to the screen of the tube to see if that
might have any ripple.

60Hz ripple should look like waves on the lines, switching supply or HV
ripple is usually tiny little jags on the lines. Someone should take
pictures and post them up on Spies or somewhere for reference. I don't have
any monitors or XY games running to demo this on...

John :-#)#

At 04:02 AM 10/17/00, Bret Pehrson wrote:
>You mention ripple, and I've heard it several times before. Would you mind
>detailing the method(s) that you use to measure ripple?
>
>My assumptions for measuring ripple are: use a DMM on the AC scale. The
>registered voltage is the ripple on that DC line currently being tested (?).
>
>Is a DMM the best thing to use to measure ripple (presuming 60 Hz)? I have
>a Tek scope, but I'm far from an expert on it...
>
>Thanks for any info,
>
>Bret
>
>
> > -----Original Message-----
> > From: owner-vectorlist@synthcom.com
> > [mailto:owner-vectorlist@synthcom.com]On Behalf Of John Robertson
> > Sent: Sunday, October 15, 2000 6:36 PM
> > To: vectorlist@synthcom.com; vectorlist@synthcom.com
> > Subject: RE: VECTOR: 6100 Wavey Letters
> >
> >
> > I assume that your +5VDC supply to the game board has a very good ground
> > connection? And the monitor is well grounded? Any ripple on the +5VDC
> > supply? How about a picture posted up somewhere for us to pick apart?
> >
> > John :-#)#
> >
> > At 03:21 AM 10/17/00, Steven Gregory wrote:
> > >On Mon, 16 Oct 2000 10:01:37 +1000, John Robertson wrote:
> > >
> > > >Have you replaced the filter caps in the HV cage? Those can
> > lead to trouble
> > > >and try and use the 105C caps, some of the 'cap kits' are not very good
> > > >with respect to special caps (low ESR or high temp) they just
> > go for the
> > > >cheapest...
> > >
> > >I totally rebuilt the cage. I swapped another deflection board and the
> > >problem
> > >went away, so its somewhere on the deflection pcb.
> > >
> > > >
> > > >We stock a number of high temp caps for vertical deflection on the
> > > >Electrohome rasters, and the HV cage on the WG XY's...
> > > >
> > > >Oh, and as we are a shop, perhaps I will charge you $0.00 for
> > the advice
> > > >;-) let's not go there...
> > > >
> > > >John :-#)#
> > > >
> > > >At 09:07 AM 10/16/00, Steven Gregory wrote:
> > > >>The cover is on the cage. The area around the high score
> > > >>has a slight wave and broken letters and the rest of the screen
> > > >>has somewhat broken letters all over. I can say the problem
> > > >>is definitely on the deflection board.
> > > >>
> > > >>
> > > >>
> > > >>On Sun, 15 Oct 2000 01:39:47 -0400, Chris Loggans wrote:
> > > >>
> > > >> >Is the cage on the HV box? Without the cage/cover there is a lot of
> > > >> >electromagnetic interference that will cause distorted letters.
> > > >> >
> > > >> >Good luck,
> > > >> >-Chris
> > > >> >
> > > >> >
> > > >> >-----Original Message-----
> > > >> >From: Steven Gregory
> > > >> >To: vectorlist@synthcom.com
> > > >> >Sent: 10/14/00 11:19 PM
> > > >> >Subject: Re: VECTOR: 6100 Wavey Letters
> > > >> >
> > > >> >My waves where much worse than shown in your pic. After
> > > >> >removing both, the problem is like what you were experiencing.
> > > >> >
> > > >> >
> > > >> >On Sat, 14 Oct 2000 22:56:25 -0400, chumblespuzz wrote:
> > > >> >
> > > >> >>Steve,
> > > >> >>
> > > >> >>As Jon Raiford stated in his reply to my original post,
> > simply removing
> > > >> >C703
> > > >> >>and C603 from the deflection board solved this problem.
> > > >> >>
> > > >> >>-roy-
> > > >> >>
> > > >> >>----- Original Message -----
> > > >> >>From: "Steven Gregory" <sgregory@arcadeshop.com>
> > > >> >>To: <vectorlist@synthcom.com>
> > > >> >>Sent: Saturday, October 14, 2000 10:31 PM
> > > >> >>Subject: Re: VECTOR: 6100 Wavey Letters
> > > >> >>
> > > >> >>
> > > >> >>> I have this same problem with a WG XY. Any help would
> > > >> >>> be appreciated.
> > > >> >>>
> > > >> >>>
> > > >> >>> On Tue, 10 Oct 2000 00:30:25 -0400, chumblespuzz wrote:
> > > >> >>>
> > > >> >>> >Hi All,
> > > >> >>> >
> > > >> >>> >Me again, still working on the Tempest.
> > > >> >>> >
> > > >> >>> >My 6100 has a strange wave to it. Check out:
> > > >> >>> >http://members.home.net/chumblespuzz/images/6100_wave1.jpg
> > > >> >>> >
> > > >> >>> >Look at the "S" in scores and the angled line on the
> > "R". See how
> > > >> >they
> > > >> >>are
> > > >> >>> >wavey? Note that the "O" and the "E" are not, as well
> > as the 0101s
> > > >> >below.
> > > >> >>> >
> > > >> >>> >Also note similar issues in the bottom image. This only
> > occurs on
> > > >> >the
> > > >> >>right
> > > >> >>> >side (bottom when horizontal).
> > > >> >>> >
> > > >> >>> >Any thoughts to why? It's not the game board as it
> > test's fine in
> > > >> >another
> > > >> >>> >machine. The monitor was just capped.
> > > >> >>> >
> > > >> >>> >Thanks!
> > > >> >>> >-roy-
> > > >> >>> >
> > > >> >>> >
> > > >> >>>
> > > >>
> > >>>----------------------------------------------------------------------
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> > > >> >>> >
> > > >> >>>
> > > >> >>>
> > > >> >>>
> > > >> >>>
> > > >> >>> Steven Gregory
> > > >> >>> ArcadeShop Amusements
> > > >> >>> sgregory@arcadeshop.com
> > > >> >>> http://www.arcadeshop.com
> > > >> >>>
> > > >> >>>
> > > >> >>>
> > > >>
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> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >Steven Gregory
> > > >> >ArcadeShop Amusements
> > > >> >sgregory@arcadeshop.com
> > > >> >http://www.arcadeshop.com
> > > >> >
> > > >> >
> > > >>
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> > > >>
> > > >>
> > > >>
> > > >>
> > > >>Steven Gregory
> > > >>ArcadeShop Amusements
> > > >>sgregory@arcadeshop.com
> > > >>http://www.arcadeshop.com
> > > >>
> > > >>
> > >
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> > > >
> > > >
> > > > John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> > > > Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
> > > > http://www.flippers.com
> > > > "Old pinballers never die, they just flip out."
> > > >
> > >
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> > >
> > >
> > >
> > >
> > >Steven Gregory
> > >ArcadeShop Amusements
> > >sgregory@arcadeshop.com
> > >http://www.arcadeshop.com
> > >
> > >
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> >
> >
> > John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> > Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
> > http://www.flippers.com
> > "Old pinballers never die, they just flip out."
> >
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>---------------------------------------------------------------------------
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  John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
  Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
  http://www.flippers.com
         "Old pinballers never die, they just flip out."

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Received on Mon Oct 16 14:32:14 2000