Re: G08 power supply

Hi Mark!

I really recommend that you bypass the +5VDC supply that came with these
games. Get a nice switching supply (computer grade is best) and hook it
into the +5VDC lines (and the grounds too...)
The original supply was a large part of the problem with the Electrohome
monitors blowing up, the +5 would drift, the output signals would go
snakey and the monitor would do a fast/slow burn...

If you don't know how to bypass the +5 supply post back to the list.

John :-#)#

Mark Jenison wrote:
>
> Hi again all,
>
> Well, thanks to Rick Schieve for giving me a spare G08 vector tube, and a
> replacement G08 HV unit from Tom Wisonski, now have a working vector monitor
> for my Tac/Scan.
>
> However, the only thing keeping me from playing it is the infamous G08 power
> supply. All voltages read fine until I plug it into the game cage, at which
> point the +5VDC drops to nearly 0VDC. The board cage is fine (tested it in my
> Eliminator), so it's not being shorted out by the boardset. Apparently the
> +5VDC is failing on becoming loaded. I had a previous power supply with the
> same problem, but found a replacement so I didn't have to deal with it. Well,
> now I'd like to repair them. Any ideas? Both have the TIP141 replaced, which
> leaves only diodes, filter caps, an LM723, and a 2N4403 transistors and some
> resistors and caps. The diodes check out.
>
> Anyone have any ideas on which part is most likely to be causing the symptom
> I'm seeing?
>
> Anyone happen to have a spare working G08 power supply (from a raster or vector
> game)?
>
> I know, I know; I should put in a switching supply, but damnit, I'm a sucker
> for dedicated hardware :-)
>
> Any help would be appreciated.
>
> ----------------------------------------------------------------------
> Mark Jenison E-mail address: jenison@cig.mot.com
> Cellular Infrastructure Group Motorola--Arlington Heights, IL
> ----------------------------------------------------------------------

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