Here are the schematics and service docs for the ARP sequencer model 1601. All pages are 8.5" x 11" at 100dpi, except for 14, 15, and 16 which are at 200dpi. Sorry for the grainy quality of the non-schematic pages, but dload speed is sometimes more important than smooth text. Note: I'm missing pages 17 and 18. If you got 'em, I'd like 'em. ARP 1601 Cover ARP 1601 Index ARP 1601 Page  2  [introduction] ARP 1601 Page  3  [function description] ARP 1601 Page  4  [theory of operation] ARP 1601 Page  5  [circuit descriptions] ARP 1601 Page  6  [continued] ARP 1601 Page  7  [continued] ARP 1601 Page  8  [test points] ARP 1601 Page  9  [continued] ARP 1601 Page 10  [calibrations] ARP 1601 Page 11  [assembly/disassembly] ARP 1601 Page 12  [block diagram] ARP 1601 Page 13  [cmos ics] ARP 1601 Page 14a [schematic 1a] ARP 1601 Page 14b [schematic 1b] ARP 1601 Page 15a [schematic 2a] ARP 1601 Page 15b [schematic 2b] ARP 1601 Page 16a [schematic 3a] ARP 1601 Page 16b [schematic 3b] ARP 1601 Page 19  [jack boards assembly] ARP 1601 Page 20  [power supply layout] ARP 1601 Page 21  [power supply schematic] ARP 1601 Page 22  [parts list]