AVATAR SERVICE MANUAL ocr

RE — r aa _ =: ELLE = SURF 74 PS: =. 7 | tooo CC CS OO Os —û—Û—Û@0—— — — — —— ar == waa San iS aa | as. = = —— —— | | ARP INSTRUMENTS, INC | | 5 Hartwell Avenue | | Lexington, MA 02173 | | (617) 861 - 600 | | Document Number 9002: | © January, 1978 | | © January, 1978 | P INSTRUMENTS. INC | | ARP INSTRUMENTS, INC. | | THE INFORMATION CONTAINED HEREIN IS CONFIDENTIAL AND PROPRIETARY TO ARP INSTRUMENTS, INC: IT IS | | DISCLOSED TO YOU SOLELY FOR PURPOSES OF INSTRUCTION AS TO OPERATION OF THE EQUIPMENT AND | MAINTENANCE AS APPROPRIATE. IT iS NOT TO BE USED BY YOU FOR ANY OTHER PURPOSE, NOR IS IT TO BI | JISCLOSED TO OTHERS WITHOUT THE E SS PERMISSION OF ARP INSTRUMENTS, INC | | | DISCLOSED T RS WITHOUT THE ESS. SION E | L EE L = ns | ACER En ae a= L J SECTION 1 General Inform ation................................................................... 1 SECTION 2 Theory of Operation..........

ARP INSTRUMENTS, INC. 45 Hartwell Avenue Lexington, MA 02173 (617) 861 6000 Document Number 90024 © January, 1978 ARP INSTRUMENTS, INC. CONTENTS SECTION 1 General Inform ation................................................................... 1 SECTION 2 Theory of Operation...................................................................4 SECTION 3 Circuit Descriptions.....................................................................7 SECTION 4 Test Points................................................................................ 15 SECTION 5 Trim Procedures....................................................................... 22 SECTION 6 Schematics & Assemblies.......................................................... 26 SECTION 7 Parts List.................................................................................... 44 SECTION 1 GENERAL INFORMATION 1.1 Introduction Warm-up Drift: 1/30 semitone from turn-on max. Pulse Width: 50% to 5% The AVATAR is divided into two sections: The Pulse Width Modulation: ADSR, + 45%; LFO, + 15% Synthesizer and Pitch Extractor/CV Generator. Voltage Controlled Response: 1 V/Octave Maximum Freq. Shifts: LFO sine wave, + Vi oct.; The…