Re: Amplifone problem

I had this problem on a battlezone and it had to do with the 'window circuit' The circuit was bad and what the game pcb was doing was turning off the beam everywhere because it thought it was trying to draw outside the 'game window' (in the score areas).

  ----- Original Message -----
  From: Jess Askey
  To: vectorlist@vectorlist.org
  Sent: Wednesday, July 13, 2011 6:53 PM
  Subject: Re: VECTOR: 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> 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> wrote:
>
> From: Andre Sinclair <livnfree_can@yahoo.com>
> Subject: Re: VECTOR: Amplifone problem
> 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> 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 22:31:20 2011