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

>