OBERHEIM SYNTH

I wish you both the best of luck.  Let me know when you decide to 
sell it as parts. 
--- In oberheim@yahoogroups.com, "Paul J. White" <pjwhite@...> wrote:
>
> At 11:14 AM 2/17/09, you wrote:
> 
> >Did some work over the weekend.Here's what I found.The "D3" line 
is 
> >loaded down to about 2 volts.All the other Data lines are reading 
> >4.8- 5 volts.Pulled the PROMS, didn't make any difference.How 
many, 
> >and what I.C.s can I remove in what sequence without damaging the 
> >components to isolate the problem?
> 
> Remove any and all ICs that have a connection to D3 one at a time 
> until the loading goes away.  You shouldn't damage anything if you 
> turn off the power between each part removal.  You've already 
tried 
> the EPROMs -- try removing the RAM chips, latches and buffers 
> connected to D3 (A29 through A34, A102 through A105, A110 through 
> A115 and as a last resort, try replacing the Z80.
> 
> Removing voice cards won't help, as this signal doesn't go 
directly 
> to the any voices.
> 
> -- Paul White
> http://www.electrongate.com/dmxfiles
>