Re: Still having trouble with Red Baron display

Thanks Chris,
I do have a scope, but I've never used it. (It's an old Heath/Schlumberger
my dad got years ago, and it's never been out of the box. No docs or
instructions....)

I'm thinking that somewhere in the Y circuit I'm losing voltages to an IC or
ICs. I thought it would be one of the ICs, and I could solve it by shotgun
replacement. Maybe it's a cap or resistor shorted to ground. I guess I'll
make sure that each of these ICs is getting +/- 15 and +/- 5 where it
should. Maybe I'll go ahead and replace the DAC08 and the LS273 while I'm at
it.

Lewis

----- Original Message -----
From: "Christopher X. Candreva" <chris@westnet.com>
To: <vectorlist@synthcom.com>
Sent: Friday, October 05, 2001 7:38 PM
Subject: Re: VECTOR: Still having trouble with Red Baron display

> On Fri, 5 Oct 2001, Lewis Mills wrote:
>
> > Hi all,
> > I'm working on a Red Baron board set that only displays in the bottom
half
> > of the monitor (on a monitor and in a cabinet that both work fine with a
> > good Battlezone boardset).
>
> I'm guessing you don't have a O-scope since you are swapping parts out.
> However, a scope makes it easy. In a nutshell, check the testpoints.
> Picture still bad ? Take the schematic and start tracing the path
> backwards, from the outputs of the DACS, through the op-amps, until you
find
> where it is bad.
>
> I had an Asteroids bard that was bad like this, was a bad op-amp (tl082 I
> think it was, which you said you replaced already.)
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 967-7816
> WestNet Internet Services of Westchester
> http://www.westnet.com/
>
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Received on Fri Oct 5 19:52:08 2001