these are the roland TB-303 service notes: roland.TR-303.schem-1.gif 43k specifications, knob/ case part no. roland.TR-303.schem-2.gif 40k IC pinouts roland.TR-303.schem-3.gif 57k block diagram roland.TR-303.schem-4.gif 105k digital schematic roland.TR-303.schem-5.gif 145k analogue schematic roland.TR-303.schem-6.gif 83k adjustment, view from component side roland.TR-303.schem-7.gif 69k adjustment, view from foil side roland.TR-303.schem-8.gif 47k vcf envelope modulation, parts list additional higher resolution scans of pages 6 and 7 are split into left and right pages. scans by robin whittle (http://www.firstpr.com.au) roland.TB-303.schem-6-left-150dpi.jpg roland.TB-303.schem-6-right-150dpi.jpg roland.TB-303.schem-7-left-150dpi.jpg roland.TB-303.schem-7-right-150dpi.jpg