Dear Kevin: I've been browsing the web for a schematic for the Heathkit ET-1000 digital trainer and I saw your posting. The unit has been fully repaired, but I'm still worried about future repairs. By any chance or design, do you have a schematic you could fax or email me? It would even be helpful (and perhaps sufficient) if you could identify the DIP chip on the Main Board (not the Power Supply board) that is labeled "2206CP 8271". Might it be a function generator chip? NTE and other sources do not list what this chip is or what it does. Anyway, if you still have data on the ET-1000 help would be very much appreciated! Thanks, Dave (DFoster(a)aol.com)