Re: WG6100 Problems (Please Help).

It all depends what you mean by "back-to-back zeners". You
should have one lead of each (either both cathodes or both anodes)
connected together (NOT to the board) and the remaining leads
connected from the input to ground.

If you have both leads of both parts connected to the board there
isn't going to be enough signal left to do very much.

jwelser@ccwf.cc.utexas.edu wrote:

> On Sun, 17 Oct 1999, John Robertson wrote:
>
> > Have you installed the over-deflection safety circuit? This is the zener
> > diodes on the inputs to the monitor and are designed to limit the beam
> > deflection to the maximum the transistors can handle. This info is about
> > 1/8th of the way down, titled:
> >
> > Atari Color X-Y Display Deflection PCB
> >
> > This might save the monitor from further blow-ups caused by the logic board.
> >
> > John :-#)#
>
> I asked this question of the list a month or so ago, and didn't
> get an answer, but John's message has prompted me to ask again....
>
> Has anybody gotten this to work, in practice? In theory, I know
> that the back-to-back Zeners on the inputs should work, but in practice (I
> have tried installing this on 3 or 4 different monitors -- Wells Gardner
> and Amplifone) all this "upgrade" gives me is a solid spot-killer LED on
> an otherwise working deflection board. If I remove the back-to-back
> Zeners everything works fine again. Putting the Zeners on either channel
> causes the problem.
>
> Am I missing something? Beofre someone suggests it, yes, I did
> put the zeners together correctly...
>
> Joe
Received on Tue Oct 19 05:51:11 1999