Alrighty then, let's take a crack at this.
Check the voltage on the tabs of the 3 neck board transistors. If less than
(pick a number---how about 50 volts?) check the Video B+ from the HV board
to the neck board. (It's just rude of Atari not to put HOW MUCH voltage
there should be there on the schematic, let's just take a wild-ass guess of
100.)
Voltages low? C24 on neck board could be open or shorted (or leaky or put
in backwards) or CR3 on HV could be bad (or the wrong part).
Voltages look OK? Well, that would be a whole different article.
On Sun, Jun 20, 2010 at 9:00 PM, Kevin Moore <talon.k@gmail.com> wrote:
> So I've been digging around for the past couple days with this Amplifone
> monitor with little luck.
>
> All the colors are on at the same time, and I'm getting retrace lines.
>
> I am able to adjust the colors intensity individually.
>
> I can adjust screen, and brightness.
>
> Looking at the schematics, it seem the blanking and Z control are one in
> the same? I'm still not 100% up on vector monitors.
>
> Basically what I have is white lines for everything, including the retrace
> lines.
>
> I've checked the RGB transistors on the neck board for possible shorting,
> causing all the guns to come on all the time, I've replaced all the
> transistors in the input protection circuit, and the spot killer circuit..
>
> I'm at a loss for the moment.
>
> Kevin
>
>
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Received on Sun Jun 20 23:51:24 2010
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