TECH: Capcom BBB lights "pulsing"

I'm working on a Big Bang Bar right now with a strange lighting
problem. All of the lights seem to pulse, for lack of a better word.
In test, when all of the lights are supposed to be on solid, they
quickly pulse from normal brightness to dim, almost like the lamp
matrix is being swept through, but at too slow of a rate. Another
strange thing is that even when all lights should be turned off, the
filament on every one of them can be seen VERY faintly pulsing.

I started by checking the +20V lines for the matrix, and everything is
fine (ripple is ~40mV). I also disconnected all lamps from the matrix
and hooked up a single bulb directly to the headers and it still
pulsed. I'm thinking that I have some kind of logic problem that is
inadvertently enabling the lamp matrix. I believe that I have the
skills and tools to troubleshoot this, but I don't have a schematic,
which is really holding me back.

If anybody has any ideas, or better yet a schematic, I would love to
hear from you!
Thanks!
-Jason Richard
.

Relevant Pages

  • Re: TECH: Capcom BBB lights "pulsing"
    ... Jason Richard wrote: ... All of the lights seem to pulse, for lack of a better word. ... inadvertently enabling the lamp matrix. ...
    (rec.games.pinball)
  • Re: TECH: Capcom BBB lights "pulsing"
    ...  All of the lights seem to pulse, for lack of a better word. ... In test, when all of the lights are supposed to be on solid, they ... inadvertently enabling the lamp matrix. ... All my Capcom pins do this, ...
    (rec.games.pinball)
  • Re: TECH: Capcom BBB lights "pulsing"
    ... All of the lights seem to pulse, for lack of a better word. ... quickly pulse from normal brightness to dim, ... inadvertently enabling the lamp matrix. ...
    (rec.games.pinball)
  • Re: TECH: Capcom BBB lights "pulsing"
    ... All of the lights seem to pulse, for lack of a better word. ... filament on every one of them can be seen VERY faintly pulsing. ... inadvertently enabling the lamp matrix. ...
    (rec.games.pinball)
  • Re: i got trapped in Wales because
    ... 'one frequency' LEDs. ... The 'high efficiency bulb' in my reading lamp has three distinct ... lights have triggered seizures in people ...
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