RE: WG6100 help, still struggling

www.arcadehelp.com/manual/monitor/wells/K6100_Manual_3rd.pdf

JB

-----Original Message-----
From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Robb Gonyer
Sent: Saturday, March 06, 2004 6:51 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: WG6100 help, still struggling

>
> On Sat, 6 Mar 2004 21:00:35 +0100, "MyPearl" <mypearl@dds.nl> wrote:
>
> >These problems often occur in the differential amlifiers, but since
you
> have
> >a problem on both axes, I would look for a common source. Have you
> checked
> >the power supply rails?
> >
> >It could also be VERY well that the input protection is kicking in
too
> >early. Try to lower the size on the game PCB and see what happens.
>
> I was going to suggest the same thing. I've had problems with the Rev
3
> input
> protection circuit in the past. I usually disable it since it doesn't
> provide
> much protection as is, and keeps you from running earlier versions of
> Tempest.
>
> *If* this is a Rev 3 deflection board you can try unsoldering and
lifting
> one
> leg on each of the diodes 805 - 808 (I think that's right, check the
> schematic
> to be sure). If it's not a Rev 3 board, these diodes won't exist, and
the
> new
> protection circuit is obviously not your problem.
>
> -Zonn

That turned out to be it! I lifted one side of D805 - D808, two of them
tested a little funny. So I left them lifted, hooked it up, and it
looks absolutely perfect.

Thank you everyone for all the help, I really appreciate it. Now, when
I get a few minutes I'll post about troublemaking monitor number two. :)

By the way, does anyone have an electronic copy of the third printing of
the WG6100 manual? I just dug through all my paper copies, all I have
is 1st and 2nd printings. Id like to get the schematics that show those
diodes so I can understand what was going on, as well as replace them
with the proper parts.

Thanks again
Robb

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