Sony str de 845 service manual
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Extracted text from sony str de 845 service manual (Ocr-read)
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Table of Contents 1. Introduction..................................... 1 Purpose ............................................................ 1 Receiver ........................................................... 1 Layout .............................................................. 1 2. Sound Fields .................................... 2 What is a Sound Field? .................................... 2 Sound Field T ypes ............................................ 2 Virtual ............................................................... 3 Cinema Studio .................................................. 6 Semi Cinema Studio ......................................... 6 Theater ............................................................. 6 Music ................................................................ 6 Active Speaker Chart ....................................... 7 Table 2-1 - Input Software Format .................... 9 3. Digital Board Inputs ....................... 10 Analog Inputs .................................................. 10 Digital Inputs .................................................... 10 Software Formats Illustrated ........................... 12 4. Control Signal Block ...................... 14 Input/Output Select ICs Control Signal Block ........................................ 14 Digital Processing ICs Control Signal Block ........................................ 15 5. Analog signal Block ....................... 19 Circuit Description ........................................... 21 6. Digital Signal Block ........................ 23 7. Mute Signal Block .......................... 25 8. Troubleshooting Block .................. 26 9. DAV-C700 Switching Type Power Su pply ...................................... 28 Safety for You and the Circuit .......................... 28 Power Supply Operation ................................. 28 Regulation ....................................................... 32 How to Troubleshoot the Power Supply .......... 33 Testing the Power Supply Unloaded ............... 35 Troubleshooting Shortcut s .............................. 36 10. Hi-Fi Output Troubleshooting Overview............................................. 37 11. Troubleshooting Driver Amplifier & Bias Network Circuits .... 39 Protection light will not go off after replacing Output transistors ............................................ 39 Excessive Current Draw .................................. 40 12. Troubleshooting Audio Protection Circuits ............................. 43 (+/-) Offset Protection Circuit ........................... 44 Over Current Protection Circuit ....................... 45 13. Super Audio CD ............................ 46 Overview......................................................... 46 The New Format for the Age of Digital Pure Audio ............................................ 46 The DSD Format: No Data Decimination or Interpolation R equired ................................. 48 Delta Signal Modulation and A/D Converter .... 49 Disc Features and Watermark Technology ..... 53 Appendix: Individual IC Functional Description ....................... i IC1201 System Control.................................... i IC1101 Digital Audio I/F Receiver (DIR) ........... i IC1301 Digital Audio Decoder (DAD) ............... i IC1401 Audio DSP ........................................... i IC1503 Audio Codec ........................................ i IC1403 SRAM (St atic RAM) ............................. i
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1 1. Introduction Introduction Purpose The focus of this book is on the digital board operation in the sample receiver (STR-DE845) and covers the following subjects: -A working understanding of sound fields and what type of movie or music software should be used with each sound field for optimal performance. -Proper use of the digital board inputs. -Which speakers receive actual audio while in various sound field modes. -Simplified circuit diagram and operation of the digital board for troubleshooting. To properly troubleshoot the Digital board, a good understanding of what sound fields are and how they affect the input is essential. Once a good working knowledge of sound fields is obtained, the receiver can be better set up to process the movie or music software for the best quality audio output. The information in this book will also help the technician determine whether a customers problem is a receiver setup or an actual circuit defect. Receiver The main receiver used for demonstration throughout this book is the STR-DE845. The STR-V444ES digital board will also be covered, showing the DSP circuit changes as compared to the STR-DE845 only. The overall operation of the digital board in both models is the same. Layout Chapter 2 covers the theory and functional description of the various sound fields. Chapter 3 illustrates the proper use of the receiver (digital board) inputs on the rear panel. Chapters 4, 5, 6 and 7 provide the technician with block diagram descriptions of the four main systems found on the digital board. Chapter 8 describes a very practical troubleshooting method for determining a defective component on the digital board. There is also an appendix at the end of the manual that provides a brief description of the function of the main ICs on the digital board.