Re: Omega Race Question

I have not got that schematic in front of me, but I have found that
sometimes the output op amps, even though they look good on the scope, have
a problem and when replaced the picture returns to normal. This has
happened in Asteroids, and I suspect that similar output stage is present
in Omega Race. The CMOS output switch has also given weird results...

John :-#)#

At 06:38 PM 9/11/1999 -0600, you wrote:
>Dan Todd wrote:
> >
> > If you are missing the left half of the picture it sounds like one of the
> > chassis transistors on the monitor.
>
>But since he has the same pic on his scope, that points to the game PCB.
>
>If you can trace the bad X signal all the way back to the DAC, first check the
>DAC inputs to see if any of them are constantly High/Low. Especially the high
>bit, it is the one that deflects the beam either positive or negative. If
>it is
>getting data and not stuck high or low, then I would susupect the DAC. Also,
>make sure any power supplies going into the DAC are correct, these can
>make big
>changes in the signal.
>
>
>
>
> >
> > Dan
> > On Sat, 11 Sep 1999 00:04:36 -0700 (PDT), you wrote:
> >
> > >3) I'm getting a full Y output on my *scope* but I can't figure out why
> > >the left (X half) of the screen is missing. The TL08x op amps on the x
> > >side are getting proper voltages and the inputs and outputs look like
> > >they've got a good signal. As I go further back into the circuit I'm not
> > >seeing anything that stands out as a bad signals. Is there anything I
> > >should be suspicious of when the left have is missing?

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Received on Sun Sep 12 23:00:02 1999