Re: My Ast. Deluxe is on the fritz

On Sun, 15 Apr 2007, Bob Langelius wrote:

> One of the x or y seems to be fluctuating around 1-3v the other y or x is
> steady at around -9v
>
> Any idea what I should be looking at? I'd like to try and fix this pcb as
> all the numbers in the machine match and it has the original roms.

First make sure all power supply voltages are correct.

I usually trouble shoot these with a scope. If the picture is bad at the
test points, start at the outpouts of the DACs, if it's good there, work
forward until you find where it goes bad.

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Chris Candreva -- chris@westnet.com -- (914) 948-3162
WestNet Internet Services of Westchester
http://www.westnet.com/
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Received on Mon Apr 16 14:26:26 2007