Re: Tempest lines fading

Have you checked the output waveforms on an scope (Both XY and normal mode)?
I think you should be able to tell what's going wrong then.
The pics can't tell me exactly what your problem is, actually...

----- Original Message -----
From: "Joe" <jb@joesarcade.com>
To: <vectorlist@vectorlist.org>
Sent: Friday, August 29, 2003 11:46 PM
Subject: RE: VECTOR: Tempest lines fading

> Anyone have any thoughts on this? Or are the pics not good enough?
>
> Thanks,
> Joe
>
> -----Original Message-----
> From: Joe
> Sent: Tuesday, August 26, 2003 10:01 PM
> To: vectorlist@vectorlist.org
> Subject: RE: VECTOR: Tempest lines fading
>
> Here's 2 short movies I took of it.. It is not the monitor. I connected
> this to my 25" amp to take the movie.
>
> www.joesarcade.com/temp1.mov
> www.joesarcade.com/temp2.mov
>
> Any suggestions are welcomed.
>
> Thanks,
> JB
>
> -----Original Message-----
> From: Joe
> Sent: Tuesday, August 26, 2003 8:32 PM
> To: vectorlist@vectorlist.org
> Subject: RE: VECTOR: Tempest lines fading
>
> Yes. This is not the monitor. SEVERAL other boards work just fine with
> this monitor... This is just a problem with one or two boards.... I'll
> try to get some pics...
>
> JB
>
> -----Original Message-----
> From: Andy Welburn [mailto:andy@andys-arcade.com]
> Sent: Tuesday, August 26, 2003 7:02 PM
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: Tempest lines fading
>
> I'm maybe not up to speed on this one, have you tried the pcb with a
> different monitor or vice versa ?
>
> I have come across temperamental blanking Z circuits in G05's and 6100's
> before, usually its down to a transistor breaking down under load in the
> Z
> section on the monitor... very hard to spot as the transistors checked
> good
> out of circuit on my meter (fluke 12 that can spot leakage).
>
> I also had a similar problem with a battlezone pcb that would trip the Z
> circuit on the G05 infrequently.. I didn't suspect the pcb until i got
> another G05 which did the same thing and realised it was the pcb not the
> monitor... the battlezone AVG section 'crops' the picture so that it
> doesn't
> display a super widescreen version, and instead makes it 4:3 for the
> monitor
> (yes thats a simplified rendition of what it actually does).. what was
> happening in my case was the picture wasn't being cropped, so even
> though
> the game played perfectly, it was displaying the mountains way off the
> side
> of the tube, therefore giving the Z section on the monitor a headache as
> it
> wasn't sure if it should kill the beam or not. This probably doesn't
> apply
> to tempest as there are no conceivably huge landscapes involved....
>
> Maybe that doesn't help, but try shotgunning the Z on the monitor, a
> handful
> of 2n3906's and some MPSA56's i think should do the trick. It just
> sounds
> odd that it would be the same problem on 2 pcbs...
>
> Andy Welburn
> www.andys-arcade.com
>
> ----- Original Message -----
> From: "Joe" <jb@joesarcade.com>
> To: <vectorlist@vectorlist.org>
> Sent: Tuesday, August 26, 2003 4:02 PM
> Subject: VECTOR: Tempest lines fading
>
>
> > I have two Tempest boards here in which the vectors fade in and out.
> On
> > the one board, I notice it most on the horizontal vectors. They start
> > off as a normal width, but will change to about half the width. When
> > faded, zeros on the screen look more like ones. Do, a high score of
> > 1010101 would look like ||||||||||, but with VERY faint lines
> connecting
> > the tops and bottoms.
> >
> > I've been concentrating on the DAC-08 area, but I feel I may be
> chasing
> > a red herring here... I know this is not related to the aux board. Any
> > suggestions?
> >
> > Thanks,
> > JB
> >
> >
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Received on Mon Sep 1 16:43:41 2003