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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> > > chris@westnet.com
> > >
> >
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Received on Wed Aug 29 14:59:23 2012