OBERHEIM SYNTH

Don't pull out ICs - pull out the voice cards.  If you have an 8 voice 
machine, on the right half of the keyboard (high notes) there will be a 
hinged shelve with 4 cards on it.  You take off two or three nuts from 
the far right side of this shelve, and then you swing the shelve up and 
you will see 4 more voice cards below it.  You have to remove all of 
these cards.  They are held in by about 5 screws each.  Make sure you 
get these all out first. 

Please take this as a constructive comment, not an insult, but if you 
don't know what the voice cards are, this project is likely way too 
complicated for you to attempt to do yourself.  An OB-X is worth big 
$$$( at least $1k) and it would be better to simply sell it on e-bat as 
is, than to start pulling things out and doing damage that cannot be 
repaired. 

I have not had any CPU related problems with my board, it has always 
been power supply, voice/mother board capacitor problems, 4053 gate 
problems, and some other mic ICs.  It sounds like you understand data 
transfer and CPUs, but this is much more about capacitors and voltage 
regulators...are you sure you are willing to put this board at risk???



-
-- In oberheim@yahoogroups.com, jim finch <jahg88@...> 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?
>