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?
----- Original Message -----
From: Joel Rosenzweig <Joel_Rosenzweig@Agilent.com>
To: <vectorlist@lists.cc.utexas.edu>
Sent: Thursday, December 09, 1999 9:39 AM
Subject: Re: Asteroids Deluxe with WG19V2000 problems

> >I seem to be getting the Z-out signal pulsing... what is the best way to
> >check? I used a volt-meter and it seems to be pulsing. (It is hanging
>
>
> The best way is to use an oscilloscope to look at the waveform. You'll
see
> the signal swing from ground to +5V. The use of a multimeter is OK, but
not
> as good since you can't verify that the signal is swinging from end to
end.
> But, as long as you read neither +5V nor 0V, that means that your signal
is
> most likely fluctuating.
>
> >around 1.6 V but moving.) Could something on the deflector board be
> hosing?
> >High voltage? Thanks.
>
>
> Do you see the other retrace lines, or does the display look normal except
> for "the white dot?" Did you mean this was one white dot in the center of
> the screen, or do you see white dots all over the screen where vectors
> intersect? If you are seeing white dots all over the screen, you may just
> have a contrast/intensity adjustment to make.
>
> Joel-
>
>
> >----- Original Message -----
>
From: Joel Rosenzweig <Joel_Rosenzweig@Agilent.com>
> >To: <vectorlist@lists.cc.utexas.edu>
> >Sent: Wednesday, December 08, 1999 3:12 PM
> >Subject: Re: Asteroids Deluxe with WG19V2000 problems
> >
> >
> >> You might verify that the Z-out signal from the game board is actually
> >> changing state. The monitor might be completely fine, but if the game
is
> >> not triggering the blanking circuit, you'll get video as you describe.
I
> >> don't remember if the Z-out is positive or negative logic, but either
> way,
> >> if it's stuck in one state, that's no good.
> >>
> >> Joel-
> >>
> >>
> >> -----Original Message-----
> >> From: Josh Wirth <jwirth@gru.net>
> >> To: vectorlist@lists.cc.utexas.edu <vectorlist@lists.cc.utexas.edu>
> >> Date: Wednesday, December 08, 1999 3:01 PM
> >> Subject: Asteroids Deluxe with WG19V2000 problems
> >>
> >>
> >> >Hey all... long time since I have been here (although I never said
much
> >> >before anyway...)
> >> >
> >> >I have an AD with WG monitor and I cannot get the white-dot to
disappear
> >> >unless the vectors are nearly invisible themselves. I have it at a
> point
> >> >where the intersection of vectors is clearly visible but the vectors
> >pretty
> >> >dim. I have the HV adjusted so the proper voltages are on Q900. The
> >> >deflection board seems to work just fine. There is very little
burn-in
> >on
> >> >the monitor (so I am guessing the tube is probably OK.) Any clues as
to
> >> >what I might need to do to get this thing up? Should I change the
high
> >> >voltage rectifier coming out of the flyback? If so, the schematics
list
> >it
> >> >as a H1809... something I haven't been able to cross-reference. Could
> >> there
> >> >be a problem with the vector generator on the main board? Any help
> would
> >> be
> >> >greatly appreciated.
> >> >
> >> >Thanks,
> >> > Josh
> >> >
> >> >
> >>
> >
> >
>
Received on Thu Dec 9 11:16:28 1999