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 08:37:56 1999