This individual contacted me via my email. According to Sound Tech support which is not the original company any more, physically relocated some time ago and lost or misplaced and never recovered the majority of their service manuals, schematics, and bulletins so nothing available for ST164. Google search as of 3/4/18 only provides the owner’s manual and a schematic of the power supply. The rest of my docs are pictures and notes I created during my troubleshoot. Given to me, my ST164 was a traveling band console mess. Major faults created during its transport. I still have some of those docs. I never heard what happened WayneV8's troubleshoot. Hope he did well. I've heard from some several others over the years, mainly non USA tech and owners. I would have liked more collaboration in order to add to the accumulation of data for others to acquire. If you run across one, good luck. Tektrax
