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sm R V IC m M A N U A L DSX DIGITAし POしYPHONIC SEQUENCER SERVICE MANUAL FEBRUARY 1982 TABLE OF CONTENTS TECHNICAし NOTES 一 Improvements and Additions — February 1982 — Functional Test and Calibration — Operation of Cassette Interface 一 Operation o-f Sync—To—Tape Circuit — Computer Interi ace Description - DSX So-ftware History - February 1982 一 DSX Connectors - Parts しist SCHEMATICS 一 Processor Board (3 Sheets) — Early Sync. Circuit — Swi tch Board — Rear Panel External Keyboard PARTS しAYOUT DIAGRAMS 一 Processor Board - Swi tch Board PRINTED CIRCUIT COMPOSITE DIAGRAMS — Processor Board — Switch Board ENGINEERING CHANGE ORDERS (ECCTs> - ECO # 201 - ECO 轉 202 - EOC 轉 203 CORRECTION NOTICE 《Business Reply しetter> OBERHEIM ELECTRONICS， INC. 2250 So. Barrington Ave. しos Angeles, CA 90064 IMPROVEMENTS AND ADDITIONS FEBRUARY 1982 E匚0 #201s This change has been made to keep the battery back—up •from -failing. It changes diode DIO from a IN斗148 to a IN4002• ECO #202: This change allows for extra storage o-f program software by changing a 2716 EPROM to a 2732 EPROM. This modifica— ti on requi. res 2 cuts, 3 jumpers, and the removal of one existing jumper on the back of the DSX control board-…