Re: Omega Race Question

Yup - I think that was the answer. I found an input that was stuck low.
I pulled out the chip and one of the pins had been cut off and I didn't
see it.

The weird thing is, now I've lost my -15 volts. I guess it's back to the
schematics. ...grumble...

Thanks...

Matt
    

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On Sat, 11 Sep 1999, Jess Askey 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?
>
>
Received on Sat Sep 11 23:26:17 1999