RE: Major Havoc Screen problems

 Hi Jon,
     
     It does not appear to be the HV unit. I took that over to my friend's
house and plopped it right into his and presto no problem. Also, my MH was
not exhibiting blooming as I understand it. I didn't *really* see any
magnifying glass look, rather it had looked like I took my x and Y size pots
and adjusted them such that my game now displayed information well off the
screen. There was no distortion in the images. Rather it was just like
someone had scaled my picture up in size and I was only seeing some of the
game on the screen. No mater how much I tried to reduce the screen size,
there was a limit and text, scores etc were off the screen.

   Any ideas as to what is wrong with my MH board? Could this be caused by
the deflection board? I am gonna try to replace this one as well to see if
I get the same symptoms, but I don't know that my monitor would display
these types of symptoms if it was a monitor problem.

   Anyhow, if anyone has any information that might help me, I would
appreciate it.

   Since I am on the subject of Major Havoc, I have another boardset that is
giving me different problems. This one seems to have stopped working on
me... sort of. It was working fine and then it stopped working, or rather
started working interemittedly. At first I thought it may be a connector
problem or a trace problem, but the connector worked fine for my other MH
boardset no matter how many times I connected or disconnected it. THis
*bad* boardset would sometimes not work and I would disconnect, re-connect
the connector many times plug it in, unplug, move the board around...
sometimes this worked other times no go. There really didn't seem to be any
correlation between me connecting/moving the board to when it would work vs
not work. I cannot figure it out. Could it be a questionable capacitor
somewhere or transistor? Also, while this board was actually working, I
would jiggle the connector or press the board in various places (with a
piece of wood) and it did not cause the game to stop, reset or do anything
funny. It was on for the long haul which makes me also believe that it was
not a connector or bad trace issue.

  ANy help on this one would also be appreciated.

Thanks Folks

-----Original Message-----
From: Jon Raiford
To: vectorlist@synthcom.com
Sent: 05/09/00 10:08 AM
Subject: Re: VECTOR: Major Havoc Screen problems

This could be blooming caused by low high voltage. What kind of monitor
are you using? If its a WG6100, you should be able to check for 180vdc
on pin 5 of the HV cage. If you are using an Amplifone, you should be
able to check one of the secondary windings on the HV transformer (it
isn't red, is it?). Btw, if anyone cares, you can also set the HV on a
G05 by either using the 90V (B+? - I don't have my schems on me) and the
400V (focus).

This could also be a problem with the HV diode. This is a very common
problem with G05's.

Jon

At 09:44 AM 9/5/2000 -0400, you wrote:

>Hello Folks,
>
> I was going through the test modes adjusting MH pots to the
screen patterns as outline in the MH docs. There were screens with
colour patterns and cross-hatches etc and I followed the instructions
for making adjustments.
>
> At one point there is a screen with a red box around the
screen and then a white box just within and then another box (looked
green although manual said it should be white) that starts outside and
shrinks smoothly in the middle, till it disappears and then starts
again. Anyhow I saw all that, made adjustments and started to play the
game. While I was playing (about 15mins), all of a sudden the picture
expanded on the screen such that objects were way off the screen that I
would normally see (almost like I zoomed in on a part of the game - or
as if I had adjusted the x & y size pots. Anyhow, it was like this and
I rebooted back to test mode to re-adjust and could not shrink the
screen back to the correct size (it was still way to stretched). I also
lost the red border around the tests screens as well and the nice smooth
shrinking box no longer is smooth.. it skips sizes and just disappears
and appears as a smaller box like it is in jerky movement mode.
>
> Anyhow, I am assuming that my pot(s) blew or something is
fishy with them. These are the ones I was adjusting:
>
>XBIP: R80 Pot - 200?
>YBIP: R81 Pot - 200?
>
>XSIZE: R34 Pot - 10K
>YSIZE: R48 Pot - 10K
>
>XCENT: R39 Pot - 10K
>YCENT: R55 Pot - 10K
>
>XLIN: R38 Pot - 2K
>YLIN: R50 Pot - 2K
>
> Anyway, can anyone confirm that I need new pots (perhaps the
x-size/y-size ones) or does anyone know if it could be something else.
Any help is appreciated.
>
>Thanks
>/\A\n\d\y/
>
>Andrew Evrovski
>Development Director
>Cyberplex Atlantic, Halifax, NS
>(TSE:CX)

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