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Digital Processor / Digital Mixer SERVICE MANUAL Models: IQ-USM 810 Some models may be exported under the name Amcron.® ©2000 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Trademark Notice: Distributed IntelligenceTM and IQ for WindowsTM are trademarks and Crown ®, IQ®, and IQ System ® are registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners. 130447-1 04-00 Rev. A IQ-USM 810 Service Manual 130447-1 Rev. A The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact the Crown Technical Support Group. Mail: P.O. Box 1000 Elkhart IN 46515-1000 Shipping: Plant 2 SW 1718 W. Mishawaka Road Elkhart IN 46517 Phone: (800) 342-6939 / (219) 294-8200 FAX: (219) 294-8301 CAUTION TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFORE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH. AVIS А PRЙVENIR LE CHOC ЙLECTRIQUE N'ENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES А L'INTЙRIEUR. DЙBRANCHER LA BORNE AVANT D'OUVRIR LA MODULE EN ARRIИRE. WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE! The lightning bolt triangle is used to alert the user to the risk of electric shock. The exclamation point triangle is used to alert the user to important operating or maintenance instructions. II ©2000 Crown International, Inc. 130447-1 Rev. A IQ-USM 810 Service Manual Revision History Revision Number Rev. A Date 04-2000 Comments Initial Printing ©2000 Crown International, Inc. III IQ-USM 810 Service Manual 130447-1 Rev. A This page intentionally left blank IV ©2000 Crown International, Inc. 130447-1 Rev. A IQ-USM 810 Service Manual Table of Contents 1 Introduction ... 1-1 1.1 Introduction ... 1-1 1.2 The IQ-USM 810 ... 1-1 1.3 Warranty ... 1-1 2 Specifications ... 2-1 3 Circuit Theory ... 3-1 3.1 Overview ... 3-1 3.2 Power Supply ... 3-1 3.3 Input ...