all schematics for sunfire equipment is monopolised and kept in top secret by carveraudiorepair.com company in gresham or. either you can ship it to them or try to troubleshoot yourself with no schematics -- good luck. they were never actually available to public and bob made a good job making sure that no other outside eye can take a look at that so copying of his designs won't reach anyone's success as opposed to nelson pass for example.