Re: Asteroids Deluxe with WG19V2000 problems

Josh Wirth wrote:
>
> If there is a black level adjustment on the WG, I'd love to know about it!

The contrast should do about the same thing as a Black Level control. I have seen monitors
where a dried out cap in the black level/contrast area have caused syptoms similar to
this.
  Using a scope you should be able to start at the Z out on the PCB and make sure you have
some good variablity (full range swing) of the signal . Follow it through the monitor and
see where the signal compresses/expands into being on all the time. Is that cryptic
enough? ;-)
  jess

> ----- Original Message -----
> From: Jess Askey <jess@magenta.com>
> To: <vectorlist@lists.cc.utexas.edu>
> Sent: Thursday, December 09, 1999 5:25 PM
> Subject: Re: Asteroids Deluxe with WG19V2000 problems
>
> > Isn't there a 'black level' adjustment somewhere on those G-05's
> somewhere. It sounds like
> > this may fix it OR there is a problem on the biasing of the input levels
> somewhere along
> > the way.
> > jess
> >
> > Josh Wirth wrote:
> > >
> > > This has got to be fixable... doesn't it? Besides, if I turn the
> > > brightness up to see the expected vectors, I get retrace vectors as
> well.
> > > That's not going to fly :). Thanks, though.
> > > ----- Original Message -----
> > > From: Mark Jenison <jenison@cig.mot.com>
> > > To: <vectorlist@lists.cc.utexas.edu>
> > > Sent: Thursday, December 09, 1999 4:43 PM
> > > Subject: Re: Asteroids Deluxe with WG19V2000 problems
> > >
> > > > Hi,
> > > >
> > > > I've had two B&W vector monitors with the same problem over the years,
> and
> > > > asked about how to fix this very same problem. After finding nothing
> > > which
> > > > helped, I just chalked it up to "the monitor is getting old", and
> lived
> > > with
> > > > the dot in the middle of the screen. Fortunately for me, there was a
> hole
> > > > burned in the phospher at the center of the tube, so I positioned it
> such
> > > that
> > > > the dot landed right in that hole, and viola! No more dot! :-)
> > > >
> > > > Mark Jenison
> > > > Always looking for the simple man's answer
> > > >
> > > > On Dec 9, 12:16pm, Josh Wirth wrote:
> > > > > Subject: Re: Asteroids Deluxe with WG19V2000 problems
> > > > > If I turn down the brightness to the point where the white dot is
> gone,
> > > I
> > > > > see only the dot intersections. If I turn it up to the point where
> the
> > > > > expected lines are visible, I see the retrace lines, also. I am
> > > thinking
> > > > > that maybe the HV cage and the tube are fine (I swapped out another
> > > tube.)
> > > > > I am going to borrow an oscilloscope and check the signal coming
> off. I
> > > am
> > > > > assuming the the best place to check this is on the Z OUT tab. My
> > > schematic
> > > > > shows pin M on the edge connector as Z OUT but I have placed it on
> K(?).
> > > I
> > > > > shorted pins 9&10 on the 12 pin connector at one time and blew the
> two
> > > 3.3
> > > > > ohm resistors there (I am not looking at the board.) Could this
> have
> > > hosed
> > > > > something else down the line?
> > > >
> >
Received on Thu Dec 9 16:46:56 1999