STR-DG820 - Sony Audio Service Manual (repair manual). Page 3

  .............................................   3

  ..................................................................   5

3-1.   Disassembly Flow  ..........................................................   9
3-2.   Case .................................................................................   9
3-3.   Front Panel Block ...........................................................   10
3-4.   Back Panel Block  ...........................................................   10
3-5.   Main Block .....................................................................   11
3-6.   MAIN Board ...................................................................   11

TEST  MODE 

 ............................................................   12

ELECTRICAL  CHECK 

 .........................................   13

6-1.  Block Diagram - MAIN Section - ...................................   14
6-2.  Block Diagram - HDMI Section - ...................................   15
6-3.  Block Diagram - DSP/XM Section - ..............................   16
6-4.  Block Diagram - AUDIO Section - .................................   17
6-5.  Block Diagram - POWER SUPPLY Section - ................   18
6-6.  Printed Wiring Board - MAIN Board - ...........................   20
6-7.  Schematic Diagram - MAIN Board (1/3) - .....................   21
6-8.  Schematic Diagram - MAIN Board (2/3) - .....................   22
6-9.  Schematic Diagram - MAIN Board (3/3) - .....................   23
6-10. Printed Wiring Board 
 

- HDMI Board (Component Side) - ................................   24

6-11. Printed Wiring Board 
 

- HDMI Board (Conductor Side) - ..................................   25

6-12.  Schematic Diagram - HDMI Board (1/2) - .....................   26
6-13.  Schematic Diagram - HDMI Board (2/2) - .....................   27
6-14. Printed Wiring Board 
 

- XM Board (US, Canadian models) - ............................   28

6-15. Schematic Diagram 
 

- XM Board (US, Canadian models) - ............................   29

6-16.  Printed Wiring Board - DSP Board - ..............................   30
6-17.  Schematic Diagram - DSP Board - .................................   31
6-18. Printed Wiring Boards 
 

- DIGITAL AUDIO Section (1/2) - .................................   32

6-19. Printed Wiring Board 
 

- DIGITAL AUDIO Section (2/2) - .................................   33

6-20. Schematic Diagram 
 

- DIGITAL AUDIO Section (1/2) - .................................   34

6-21. Schematic Diagram 
 

- DIGITAL AUDIO Section (2/2) - .................................   35

6-22.  Printed Wiring Board - MICOM Board - ........................   36
6-23.  Schematic Diagram - MICOM Board - ..........................   37
6-24.  Printed Wiring Board - DISPLAY Board - .....................   38
6-25.  Schematic Diagram - DISPLAY Board - ........................   39
6-26.  Printed Wiring Board - VIDEO Board - .........................   40
6-27.  Schematic Diagram - VIDEO Board - ............................   41
6-28.  Printed Wiring Boards - PANEL Section - .....................   42
6-29.  Schematic Diagram - PANEL Section - ..........................   43
6-30.  Printed Wiring Board - SPEAKER Board - ....................   44
6-31.  Schematic Diagram - SPEAKER Board - .......................   44
6-32.  Printed Wiring Board - DCDC Board - ..........................   45
6-33.  Schematic Diagram - DCDC Board - .............................   45
6-34.  Printed Wiring Boards - POWER Section - ....................   46
6-35.  Schematic Diagram - POWER Section - ........................   47

7-1. Case 

Section 

....................................................................  70

7-2.  Front Panel Section .........................................................   71
7-3.  Back Panel Section .........................................................   72
7-4. Chassis 

Section 

...............................................................  73

  ..............................   74

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•   Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution:  The printed pattern (copper foil) may peel away if the 

heated tip is applied for too long, so be careful!

•   Strong viscosity
 

Unleaded solder is more viscou-s (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

•   Usable with ordinary solder
 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

NOTE  OF  REPLACING  THE  IC3506  AND  IC3508  ON  
THE  HDMI  BOARD
IC3506 and IC3508 on the HDMI board cannot exchange with sin-
gle. When IC3506 and IC3508 on the HDMI board are damaged, 
exchange the entire mounted board.

NOTE  OF  REPLACING  THE  IC5021  ON  THE  DSP  
BOARD
IC5021 on the DSP board cannot exchange with single. When 
IC5021 on the DSP board is damaged, exchange the entire mount-
ed board.

NOTE  OF  REPLACING  THE  IC7005  ON  THE  MICOM 
BOARD
IC7005 on the MICOM board cannot exchange with single. When 
IC7005 on the MICOM board is damaged, exchange the entire 
mounted board.

Note: Refer to supplement-1 for the HDMI and DSP boards of print-

ed wiring boards, schematic diagram and electrical parts list 
of Chilean, Peruvian, Korean, Taiwan and Australian models.