Sony STR-DB840 Service Manual

4
TABLE OF CONTENTS
1. GENERAL ................................................................... 5
2. DISASSEMBLY ......................................................... 7
3. TEST MODE.............................................................. 10
4. DIAGRAMS
4-1. Block Diagram – MAIN Section (1/2) – ........................ 11
4-2. Block Diagram – MAIN Section (2/2) – ........................ 12
4-3. Block Diagram
– DISPLAY/POWER SUPPLY Section – ...................... 13
4-4. Note for Printed Wiring Boards and
Schematic Diagrams ...................................................... 14
4-5. Schematic Diagram – DIGITAL Board (1/3) – .............. 15
4-6. Schematic Diagram – DIGITAL Board (2/3) – .............. 16
4-7. Schematic Diagram – DIGITAL Board (3/3) – .............. 17
4-8. Printed Wiring Board
– DIGITAL Board (Component Side) – ......................... 18
4-9. Printed Wiring Board
– DIGITAL Board (Conductor Side) – ........................... 19
4-10. Printed Wiring Boards
– VIDEO/JOINT (1) (Q) Boards (DB840) –.................. 20
4-11. Schematic Diagram
– VIDEO/JOINT (1) (Q) Boards (DB840) –.................. 21
4-12. Printed Wiring Boards
– OSD/JOINT (2) (Q) Boards (DB940) – ...................... 22
4-13. Schematic Diagram
– OSD/JOINT (2) (Q) Boards (DB940) – ...................... 23
4-14. Printed Wiring Board – AU SW Board – ....................... 24
4-15. Schematic Diagram – AU SW Board – .......................... 25
4-16. Printed Wiring Board – S-VIDEO Board –.................... 26
4-17. Schematic Diagram – S-VIDEO Board –....................... 27
4-18. Printed Wiring Board –DISPLAY Board – .................... 28
4-19. Schematic Diagram – DISPLAY Board – ...................... 29
4-20. Printed Wiring Board – MAIN Board – ......................... 30
4-21. Schematic Diagram – MAIN Board (1/3) – ................... 31
4-22. Schematic Diagram – MAIN Board (2/3) – ................... 32
4-23. Schematic Diagram – MAIN Board (3/3) – ................... 33
4-24. Printed Wiring Boards – H.P/MUTING/POWER/SW/
VOL/VIDEO 3 Boards –................................................. 34
4-25. Schematic Diagram – H.P/MUTING/POWER/SW/
VOL/VIDEO 3 Boards –................................................. 35
4-26. Printed Wiring Boards – 5.1 IN/BIAS (C)/BIAS (L)/
BIAS (LS)/BIAS (R)/BIAS (RS) Boards – .................... 36
4-27. Schematic Diagram – 5.1 IN/BIAS (C)/BIAS (L)/
BIAS (LS)/BIAS (R)/BIAS (RS) Boards – .................... 37
4-28. Printed Wiring Boards –DC (1)/DC (2) Boards – .......... 38
4-29. Schematic Diagram –DC (1)/DC (2) Boards – .............. 39
4-30. Printed Wiring Boards –AC/SP Boards –....................... 40
4-31. Schematic Diagram – AC/SP Boards – .......................... 41
4-32. IC Pin Function Description ........................................... 48
5. EXPLODED VIEWS ................................................ 59
6. ELECTRICAL PARTS LIST ............................... 63

Sony STR-DB840 Specifications

General

Digital inputs	2 Optical, 1 Coaxial
Power output	100 watts per channel into 8Ω (stereo)
Frequency response	10Hz to 100kHz
Total harmonic distortion	0.09%
Input sensitivity	2.5mV (MM), 200mV (line)
Speaker load impedance	8 ohms
Dimensions	430 x 157mm
Tuning range	FM, MW
Video Connections	composite