Re: WG6100 jitters

Jon:

Did you ever try replacing the capacitors in question, or was it just a removal?

tm

Jon Raiford wrote:

> Are the jitters all over the screen? Or are they isolated in a particular
> region? If you search the archives, i have posted in the past about some
> boxy capacitors that when removed, got rid of my Tempest jitters. They
> were pulled by Wells Gardner for no apparent reason between the second and
> third revision of the monitors and were not documented in Woodcock's
> article (although he knows about them and plans to add them to the next
> revision of the doc). With that said, I don't know the locations off the
> top of my head.. Maybe someone can look it up for you.
>
> Fwiw, my problem consisted of jitters just right of center. It was a
> isolated to about 3 inches.
>
> Jon
>
> At 10:14 PM 5/13/2000 +0200, you wrote:
> >Hello Crew,
> >
> >I am having a small problem with my WG6100 Tempest monitor: the screen jitters
> >in the X direction (mounted in the cabinet this becomes the y direction).
> >
> >The trusty o'scope shows a DC negative offset of about 2 volts at the
> >output of
> >the X amplifier. On this level a high frequency noise is added which shows
> >up as
> >jerky vectors like this:
> >
> >_____/\__/\____ (should be _____________ )
> >
> >This effect shows op on both negative and positive side of the amplifier. (the
> >screen jitters both at the most upper as lower side, but it is always positive
> >going as in the example (ie. it is really DC offset noise, the amplitude is
> >always constant).
> >
> >-I have resoldered the whole X amp (actually the whole defl. board)
> >-I have made sure the power supply outputs are nice and flat
> >-I think there are no wirewound resistors because they are the same at the
> >Y amp
> >(and shouldn't that cause amplitude noise?)
> >
> >Can anybody give me a clue here, like which parts can cause the DC offset
> >of the
> >amplifier to behave like this?
> >
> >any help is greatly appreciated because my analog knowledge seizes here... :(
> >
> >Cya !
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Received on Sun May 14 22:26:28 2000