Re: Battlezone X Bip

Thought about the opamp as well. No luck.

So after going completely through the analog section, I decided there had to be something wrong with the digital input. What I've noticed in the past on my scope is that when you probe from DV?12-03 the # of peaks, or ticks decreases with each. So upon further inspection, I noticed that DVX3 didn't seem to follow that rule. DVY3 did. I compared it to another BZ. Sure enough there was a difference. DVX3 was bad. So I piggybacked onto A5 ls194 and sure enough it came back in.

Here's some pictures of the wave form, and the Diamond pattern with the X bip as far negative as it will go.

https://picasaweb.google.com/lh/photo/ss8KnfYLJuevAjWW0Mwuy81rTWPmGZl4M7h06yPvqFg?feat=directlink
Screen shot

https://picasaweb.google.com/lh/photo/Klgn_DEuu_AtDkWTVuKZkc1rTWPmGZl4M7h06yPvqFg?feat=directlink
Bad DVX3 signal

https://picasaweb.google.com/lh/photo/zcXtheC-5h6JhMj2oNgtGs1rTWPmGZl4M7h06yPvqFg?feat=directlink
Good DVX3 signal.

Problem solved.

Thanks for the input.

Kevin

On Wed, Aug 29, 2012 at 1:29 PM, <wboucher6@cogeco.ca> wrote:

Maybe a leak at opamp input A10.6, or through C59 or B10.10 ?

Bill Boucher
http://www.biltronix.com

>
>
> Well R82 and 83 are checked good, and the 6012 I had swapped this morning
> thinking that may be it. But no luck.
> I have replaced C44 and C105 those were my first suspects.
>
> It's rather an odd problem, that only affects X Bip.
>
> Kevin
>
>
> On Wed, Aug 29, 2012 at 9:06 AM, Douglas Gauck <douglas@gauck.com> wrote:
>
> > I was going to suggest reference voltages but that would affect Y BIP
> > also. You already replaced the caps (including C44 and C105 off the XREF)?
> > Maybe R82 or R83 or your 6012 is unhappy?
> >
> > On Aug 28, 2012, at 10:03 AM, Kevin Moore wrote:
> >
> > > What would be causes for the X bip not to be centered. I've checked all
> > the 1% resistors, and pot. It's not that it doesn't have good range of
> > adjust me, it's just that it's center is off, not allowing me to align it.
> > Even with the bip pot at a dead short. Also the caps in the x circuit have
> > been replaced as well. No change.
> > >
> > > I'm assuming Bip is all Analog..
> > >
> > > Kevin
> > >
> >
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> >
>
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