U.S.A.Yorkville Sound Inc.4625 Witmer Industrial EstateNiagara Falls, New York14305 USAVoice: (716) 297-2920Fax: (716) 297-3689WORLD HEADQUARTERSWEB ACCESS: http://www.yorkville.comCANADAYorkville Sound550 Granite CourtPickering, OntarioL1W-3Y8 CANADAVoice: (905) 837-8481Fax: (905) 837-8746Quality and Innovation Since 1963Printed in Canadas-mm4-1v1.pdf 09/05/00SERVICE MANUAL1. Parts List (Current Model)2. M500 Input Board• M500 Schematic• M500 PCB Layout3. M1098 Power Amp Board• M1098 Schematic• M1098 PCB Layout4. M520 Power Amp Board (older version)• M520 Schematic• M520 PCB Layout5. M478 Power Amp Board (older version)• M478 Schematic• M478 PCB Layout6. Contact Information

YORKVILLE MM4 Service Manual