mjenison wrote:
> On Apr 21, 1:26 am, John Robertson <s...@[EMAIL PROTECTED]
> wrote:
>> ZFcamaro wrote:
>>> Looking for a complete and working set, ready to plug and play. Also
>>> need a working power supply for this and another sega vector game.
>>> Ready to buy, name your price.
>> Do NOT power your Sega vector game from the original power supply
unless
>> you like blowing up GO8 monitors. Much better to adapt a switching
power
>> supply and add good grounds between the power supply, boards and
>> monitor. This will give long life to teh monitor.
>>
>> Find an audio amp module to replace the amp in the old power supply...
>>
>> John :-#)#
>
> I don't know how many times I've seen this response from you, John :-)
>
> While I don't disagree that upgrading to a switching power supply
> would be a good thing, I often cringe thinking about this, because the
> power supply does incase the audio amp ****tion. And you get a fairly
> good rats nest going on when you try to integrate the existing wiring
> harness with a switching power supply (if you can find one that
> supplies the needed -12VDC as well) and also feed wires off of that to
> integrate whatever sound amp solution you come up with. It can be
> done neatly, but it's a lot of work to do it the right way (I've done
> this once; I used an old Bally/Midway audio amp from a Tron game).
>
> I've personally had good luck with just replacing the transistors that
> fail and cleaning up the connections; the flaky connections often
> being the root of all evil.
>
> The ideal solution would be if some enterprising individual could come
> up with an ArcadeShop style powersupply conversion kit with integrated
> audio amp that could be a drop in replacement...
>
> --
> Mark Jenison
If you want to save the original power supply then the most im****tant
step is to make sure there is a very good common/ground connection
between the power supply, logic boards, and the monitor. IF the
common/ground is well taken care of then there is a much less chance of
a problem with the monitor. I found in most cases the problem was a bad
common/ground at the power supply and this would allow the board and
monitor commons to drift apart - biasing the monitor into no-mans-land
electically speaking and blowing the outputs.
You see the monitor runs on a signal from the logic board that is
assumed to have common as the, well, common point (0 Volts). What
happens is if the common connection at the power supply deteriorates,
but the common to the monitor does not, then you have a situation where
monitor and logic board no longer share the same reference point (0VDC).
This leads to the monitor being overdriven on the horizontal or vertical
(or both) axis and rapid failure (the FIRE problem noted elsewhere on
the 'net). This is true of ALL XY monitors and is common on Atari games
that have cooked edge connectors for the common terminals. Atari does
have solid common/ground connections that tie everything to the chassis,
and if this is not defeated the monitors usually have a better survival
rate than Sega.
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
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