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File name Yamaha RX-485_485RDS.pdf

STEREO RECEIVER RX-485/ RX-485RDS SERVICE MANUAL IMPORTANT NOTICE This manual has been provided for the use of authorized YAMAHA Retailers and their selVice personnel. It has been assumed that basic selVice procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated. WARNING: Failure to follow appropriate selVice and safety procedures when selVicing this product may result in personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any selVice required should be perfonned by an authorized YAMAHA Retailer or the appointed selVice representative. The presentation or sale of this manual to any individual or firm does not constitute authorization, cenification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form. IMPORTANT: The data provided is believed to be accurate and applicable to the unites) indicated on the cover. The reseach, engineering, and selVice depanments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's SelVice Division. WARNING: IMPORTANT: Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). Tum the unit OFF during disassembly and pan replacement. Recheck all work before you apply power to the unit. · CONTENTS TO SERVICE PERSONNEL FRONT PANELS REAR PANELS SPECIFICATIONS INTERNAL VIEW DISASSEMBLY PROCEDURES AMP ADJUSTMENTS TEST MODE TUNER ADJUSTMENTS RX-485 BLOCK DIAGRAM RX-485RDS BLOCK DIAGRAM 1 1 2 2 3 4 5 5 6 6 7 8 11 12 13 14 15 RX-485 ~-COM DATA RX-485RDS ~-COM DATA RX·485 DISPLAY DATA RX·485RDS DISPLAY DATA FRONT END PACK TEST POINT WAVEFORMS PRINTED CIRCUIT BOARD SCHEMATIC DIAGRAM PARTS LIST REMOTE CONTROL TRANSMITTER 16-17 18-19 20 21 22 23 24-33 34-39 40-48 49 YAMAHA YAMAHA CORPORATION P.O.Box1,Hamamatsu,Japan 2.95K-223 IQl ® Printed in Japan '94.4 RX-485/RX-485RDS · TO SERVICE PERSONNEL 1. Critical Components Information. Components having special characteristics are marked and must be replaced with parts having specifications equal to those originally installed. 2. Leakage Current Measurement (For 120V Models Only). When service has been completed. it is imperative to verify that all exposed conductive surfaces are properly insulated from supply circuits. · · · Meter impedance should be equivalent to 1500 ohm shunted by 0.15J.lF. Leakage current must not exceed 0.5mA. Be sure to test for leakage with the AC plug in both polarities. WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTE