1 2005 Pioneer Home Audio Seminar VSX49TX Pioneer Electronic
Service, Inc. 2005 Slide 2 2 Welcome one and all! Your
instructorDave Kraus Slide 3 3 Introduction Why the VSX49TX? The
VSX49TX is not current product, however it tends to be the most
difficult to repair! What will be covered? The receiver in general;
more specifically 1.DSP circuitry 2.Display & System Micro
3.Amplifier and Protection circuit. 4.Power Supply 5.Trouble
Shooting Tips Slide 4 4 This seminar will be specifically about
troubleshooting techniques, no operation instructions, no theory!
Slide 5 5 What will you get out of this? What will you get out of
this? You will learn the most successful troubleshooting methods
designed to get the unit on and off your bench as quickly as
possible. You will learn more accurate repair techniques and avoid
having to replace costly boards on out-of-warranty units. Replacing
expensive boards can sometimes mean the difference between getting
the repair or having the customer walk! Slide 6 6 Bright Idea In an
effort to keep you awake, we will break for minimum of 10 minutes
every other hour of training! Slide 7 7 Topics we will cover Minor
disassembly DSP circuitry Amplifier & Protection circuits
System Microprocessor Display Microprocessor Power Supply
Additional resources Slide 8 8 Disassembly Remove no more than you
have to! Use caution when removing the back panel screws. They are
different ! You are using your ESD wrist strap arent you? Sorry
folks. ESD precautions are a fact of life! Why do your work over
and over again due to static damaged components! Slide 9 9 To start
1. Place unit as pictured and remove top, bottom and side covers.
2. Prop up unit as pictured for easy access. 3. Remove all screws
holding the DSP boards, as well as any attached connectors or wire
ties. Slide 10 10 Remove only the screws necessary as shown below.
Why spend more time than you have to? Slide 11 11 Use caution when
removing screws. There are 3 different types ! Slide 12 12 Keep
track of the screw types. Correct place for screw with integral
flat and attached star washer. Slide 13 13 With the screws removed,
gently pull back on the back panel, while extracting the DSP and
DSP3 assemblies. Slide 14 14 DSP boards removed Slide 15 15 Digital
Signal Processing The DSP circuit consists of 3 boards 1. AWK7719
DSP ASSY 2. AWK7727 DSP3 ASSY 3. AWK7725 DAC10 ASSY Slide 16 16 DSP
assemblies DAC10 ASSY #3 DSP3 ASSY #2 DSP ASSY #1 Slide 17 17 DSP
ASSY Slide 18 18 DSP3 ASSY Slide 19 19 DAC10 ASSY Slide 20 20 Setup
DVD Digital Input either Coaxial or Optical Speaker setup 5.1 or 5
channel(without Subwoofer) Must use DVD with Surround information
{Be sure to look at front panel display} For the purpose of this
seminar, we will follow the left surround channel only. Indicators
must illuminate for all channels driven. No illumination, no
audio!
