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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.
