SuperBrain QD

Hi, this my first message here on the list and so I may say "Hello, It is nice to be able to join so uncomplicated to this list and to be able to exchange itself with you over the miraculous computers of the past millennium." Some of my systems are shown at www.8bit-matrix.net <http://www.8bit-matrix.net/> . If you would like then do not hesitate to have a look at you them there. But now my actual problem. I have a SuperBrain in my collection which has an electronically problem. So I need the schematics for repair. I found some on the net but these are really unreadable because they are scanned in very low resolution an quality. When I have gotten the system the keyboard decoder chip (KR3600-XXX) was death. After I have installed a replacement the SB becomes running. After few minutes this chip was broken again and the screen driver was possibly gone with it. I have some experience and equipment to figure out electronically problems for repair. But without a readable schematics it would cost to much time. So I'm full of hope that someone here supports me to getting back this system to a proper and running state. By the way, is there a replacement (self-made GAL-XXX eg.) or source to get one original KR3600-XXX chip? Regards Juergen