Re: Amplifone problem

  that is is purpose of the spot killer circuit, to turn off the beam
when it is at rest in the center of the screen between vector
routines.... so, I would start to look at the circuit that senses the
X/Y levels and affects the brightness of the beam... much like a
'blanking' signal.

See page 8 on the manual...

http://arcarc.xmission.com/PDF_Monitors/Atari%20Monitor%20TM-239%201st%20Printing%20Amplifone%2019in%20and%2025in%20Color%20XY.pdf

jess

On 7/12/2011 10:15 PM, John Huie wrote:
> What is the Z-signal and where would I find it to check the
> connection? Is it carried on one of the pins on the wiring harness?
>
> Turning the brightness down and then adjusting the colors up doesn't
> seem to help
>
> Thanks guys.
>
> --- On *Tue, 7/12/11, Matt Quirk /<quirk.matt@gmail.com>/* wrote:
>
>
> From: Matt Quirk <quirk.matt@gmail.com>
> Subject: Re: VECTOR: Amplifone problem
> To: vectorlist@vectorlist.org
> Date: Tuesday, July 12, 2011, 6:42 PM
>
> I had this same problem on my omega race it ended up being a loose
> connection on the Z - signal.
>
> On Jul 12, 2011 9:30 PM, "John Huie" <jehuie@sbcglobal.net
> </mc/compose?to=jehuie@sbcglobal.net>> wrote:
> > Yes, I've done that. But if I turn it down enough to kill the
> spot then I can't see any of the other graphics.
> >
> > --- On Tue, 7/12/11, Andre Sinclair <livnfree_can@yahoo.com
> </mc/compose?to=livnfree_can@yahoo.com>> wrote:
> >
> > From: Andre Sinclair <livnfree_can@yahoo.com
> </mc/compose?to=livnfree_can@yahoo.com>>
> > Subject: Re: VECTOR: Amplifone problem
> > To: vectorlist@vectorlist.org
> </mc/compose?to=vectorlist@vectorlist.org>
> > Date: Tuesday, July 12, 2011, 6:16 PM
> >
> > Turn the brightness down on the flyback.
> >
> > Sent from my Samsung Captivate(tm) on Rogers
> >
> > John Huie <jehuie@sbcglobal.net
> </mc/compose?to=jehuie@sbcglobal.net>> wrote:
> >
> >>Hey guys,
> >>
> >>I'm new to Amplifone monitors and not all that technical anyway
> but I ordered most of the parts from Bob Roberts and rebuilt one
> that was completely dead.Β Now it's working....mostly.
> >>
> >>The problem is that it has a bright spot right in the middle at
> all times.Β I don't dare turn the brightness up because I don't
> want to burn the screen.Β But the rest of the graphics are there
> and working fine.Β I've just got that blasted extra bright dot in
> the middle.
> >>
> >>I set the voltage using a HV probe early on and I don't think
> it's changed.Β I'll have to borrow a probe to check that.Β But
> the B+ is hovering at +185.Β I tried adjusting the color drive
> pots and it didn't affect the bright spot at all.
> >>
> >>Any more ideas or tips?Β Thanks!
> >
> R{.nΗ+·¬Ή»�&ή’»β{ayͺά+ή±«aΆΪ�0½η-’Ήb²Ϊ+ω^jΗ·ΆazΊ�zΛb’{’iΫ(�θnW¦²ΪΈ¬Αλ-λ\’
>

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Received on Wed Jul 13 19:53:18 2011