Vintage Simmons Drums (UK) Users Group

Just picked up a faulty SDS2000 (want to revisit my soldering / 
faultfinding skills and fill up some empty evenings) just wondering if 
anyone has or can point me in the direction of service guides or 
schematics? Apparently it all buzzes and the lights work but no sound 
out...keeping my mind open until I can do some experimentation myself, 
being a computer service engineer Ive learnt not to take other peoples 
explanation of the symptoms too seriously