--- On Wed, 2/18/09, jim finch <jahg88@...> wrote:

From: jim finch <jahg88@...>
Subject: [oberheim] Re: OB-x Troubleshooting
To: oberheim@yahoogroups.com
Date: Wednesday, February 18, 2009, 10:23 AM

I know that it's not power supply related.I have replaced some of the tantalum caps that fried on one of the voice cards.Yes, I know what the voice cards are :).I have a four voice model.It is the D3 data line thats causing the problem.There' s only about seven or eight chips that use the data buss.From experience,usually buss latchs,74244, 245 or 373 tend to fail first.There is a tantalum cap used in the reset for the proceesor but reset timing looks good via O-scope.
Yeah ,I know they are worth alot-less than 1000 were made.I do have extensive digital troubleshooing experience,just not with stuff quite this old.I have to dust off what I learned 20 yrs ago to fix this one.
Object is to get it up and running 100%,then sell to the highest bidder.I have an OB-8,along with 14 other keyboards,mostly old analog stuff.Wife says I have to sell some of it.Little does she know I'm going to spend it all on Ebay!