If the chips are socketed rather than soldered, with the machine unplugged very very carefully lever them out a little bit and push them back in a few times this will clean the contacts and might help.
It's happens a lot with old socket chips as they oxidize over time and get bad contacts.

Best Regards

Neil Hester
www.pro-tools-pc.com

On 23 May 2015 02:25, "Bob Grieb bobgrieb@... [oberheim]" < oberheim@yahoogroups.com > wrote:

 

If you search for Linn 9000 schematic, you will find it quickly.

I just downloaded it.   Unfortunately, the scan of the processor page is

pretty bad.    That's where you would want to start if it's not coming up.

If you have blocks on the display, it's not getting initialized, so the CPU
is probably not running correctly.   Could be bit rot in the EPROMs,

or a bad chip.   Or a power supply cap that's failed.   Lots of things.

If you don't have a scope, I would say don't bother.

      Bob

---

From: " richtrix@... [oberheim]" < oberheim@yahoogroups.com >
To: oberheim@yahoogroups.com
Sent: Friday, May 22, 2015 6:32 PM
Subject: Re: [oberheim] Anyone here know anything about the Linn 9000

Thanks Denny,

Yeah I know they are around still. They will cost an arm and a leg though I'm sure. I am surprised I can't even find a service manual online (Forat has them for sale). I am ok with dealing with electronics and would like to give it a stab. Just seeing if there is anyone out there in the ether that knows anything about these. 

Sincerely,

Rich Clarke