Re: Sega monitor questions

"Off course"? That is the certainly the case when using a linear supply, to
get "on course" <;-)>, I do recommend the use of the switcher on
Electrohome/Sega vector games. I do believe that the monitors failed from
ground reference problems caused by the linear supply having burnt ground
connectors. Saw a lot of this with Gottlieb Pinball games burning out the
driver transistors because the ground reference on the power supply would
drift with respect to the ground of the driver transistors due to the
ground point of the regulator board overheating and allowing a fractional
volt difference between the regulator and the main cabinet ground. Once you
would get a difference of 0.7VDC the transistors would start to turn on,
blowing them slowly...

As for the relay, does Digi-Key or Radio Crap not carry these? I guess you
could use a 12VDC relay and run off one of the spare 12VDC outputs of the
switcher, but I thought hooking it to the actual +5 supply would give a
safer drop-out response.

John :-#)#

At 04:28 AM 11/28/00, Kev wrote:
>Off course I'm using the original supply! I did hardwire the 5 VDC line in
>(removing the molex connector on the power supply). Does the connector on
>the cage also burn?
>
>The assumption here is the XY generator is effected by the ripple in the
>+5VDC & not from the monitor right?
>
>The spot killer idea sound good and I'll probably look into that.
>
>I may place a SPS in there once I get closer to installing Atari games.
>
>Thanks,
>Kev
>
>Oh, where did you get that relay?
>
> > I hope you are NOT using the original +5VDC power supply! Sounds like
> > ripple to me. Plus they have a bad tendency to burn the ground connectors
> > and this will cause a ground fault (ground voltage reference) that can fry
> > the monitor. I REALLY recommend that you wire in a computer switching
>power
> > supply to this game, plus hook up a 6VDC relay across the +5VDC supply and
> > wire it so if the +5VDC fails then power is cut off to the monitor. 4PDT
> > relay with ten amp contacts would work very well here.
> >
> > John :-#)#
>
>
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Received on Mon Nov 27 14:03:21 2000