STR-DB900 - Sony Audio Service Manual (repair manual)

str-db900 service manual
Model
STR-DB900
Pages
62
Size
4.15 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
str-db900.pdf
Date

Read Sony STR-DB900 Service Manual online

STR-DB900
AEP Model
UK Model
E Model
SERVICE MANUAL
FM STEREO FM/AM RECEIVER
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
9-879-123-01
2004H0278-1
© 2004.08
SPECIFICATIONS
Ver 1.0  2004.08
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
“DTS” and “DTS Digital Surround” are trademarks of Digital
Theater Systems, Inc.
Amplifier section
POWER OUTPUT
Rated power output in stereo mode
(8 ohms, 1 kHz, DIN)
120 W + 120 W
Reference power output
(8 ohms, 20 Hz – 20 kHz, THD 0.7%)
FRONT*: 100 W + 100 W
CENTER*: 100 W
SURROUND*:100 W + 100 W
SURROUND BACK*:100 W
* Depending on the sound field settings and source being used, there
   may be no sound output.
Inputs (Analog)
Sensitivity: 500 mV
Impedance:
50 kilohms
Inputs (Digital)
DVD (Coaxial)
Impedance: 75 ohms
Outputs
LINE (subwoofer)
Voltage: 2 V
Impedance: 1 kilohm
FM tuner section
Tuning range
87.5 – 108.0 MHz
Antenna terminals
75 ohms, unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
531 – 1,602 kHz
Antenna
Loop antenna
Intermediate frequency
450 kHz
General
Receiver
Power requirements
230 V AC, 50/60 Hz
Power consumption
130 W
Dimensions (w/h/d)
430 
×
 85 
×
 400 mm
including projecting parts and
controls
Mass (approx.)
6.2 kg
Remote control
Remote control system
Infrared control
Power requirements
3 V DC with two R6 (size-AA)
batteries
Dimensions
210 
×
 49 
×
 25 mm
Mass (approx.)
85 g excluding batteries
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Remote commander (1)
R6 (size AA) batteries (2)
Design and specifications are subject to change without notice.
STR-DB900
2
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.)
 : LEAD FREE MARK
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!
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
0
  OR DOTTED LINE
WITH MARK 
0
 ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART NUM-
BERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY.
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
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.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TABLE OF CONTENTS
1.
SERVICING NOTES
1-1.
AMP Board, DIGITAL Board Service Position ..............
3
1-2.
Note on Checking AMP Board or DIGITAL Board
While Turning on Electricity ...........................................
3
1-3.
Note on AMP Board Removal .........................................
4
1-4.
Note on Heat Sink Installation ........................................
4
1-5.
Note on Checking POWER Board While Turning on
Electricity 1 .....................................................................
5
1-6.
Note on Checking POWER Board While Turning on
Electricity 2 .....................................................................
5
2.
GENERAL
...................................................................
6
3.
TEST MODE
...............................................................
7
4.
DIAGRAMS
4-1.
Block Diagram  — INPUT/TUNER Section — ............. 13
4-2.
Block Diagram  — AUDIO DSP Section — ................... 14
4-3.
Block Diagram  — DAMP Section — ............................ 15
4-4.
Block Diagram  — DISPLAY Section — ....................... 16
4-5.
Schematic Diagram — DIGITAL Section (1/3) — ........ 17
4-6.
Schematic Diagram — DIGITAL Section (2/3) — ........ 18
4-7.
Schematic Diagram — DIGITAL Section (3/3) — ........ 19
4-8.
Printed Wiring Board — DIGITAL Board (Side A) — .. 20
4-9.
Printed Wiring Board — DIGITAL Board (Side B) — .. 21
4-10. Printed Wiring Board — AMP Board (Side A) — ......... 22
4-11. Printed Wiring Board — AMP Board (Side B) — ......... 23
4-12. Schematic Diagram — AMP Board (1/4) — ................. 24
4-13. Schematic Diagram — AMP Board (2/4) — ................. 25
4-14. Schematic Diagram — AMP Board (3/4) — ................. 26
4-14. Schematic Diagram — AMP Board (4/4) — ................. 27
4-15. Printed Wiring Board
— VIDEO, ANALOG IN Board — ................................ 28
4-16. Schematic Diagram
— VIDEO, ANALOG IN Board — ................................ 29
4-17. Printed Wiring Board — DISPLAY Section — ............. 30
4-18. Schematic Diagram — DISPLAY Section — ................ 31
4-19. Printed Wiring Board — POWER Section — ................ 32
4-20. Schematic Diagram — POWER Section — .................. 33
5.
EXPLODED VIEWS
5-1.
Case Section .................................................................... 43
5-2.
Front Panel Section ......................................................... 44
5-3.
Chassis Section ................................................................ 45
6.
ELECTRICAL PARTS LIST
.................................. 46
3
STR-DB900
SECTION 1
SERVICING NOTES
1-1. AMP BOARD, DIGITAL BOARD SERVICE POSITION
In case of checking AMP board or DIGITAL board from bottom side, please remove those with back panel.
1-2. NOTE ON CHECKING AMP BOARD OR DIGITAL BOARD WHILE TURNING ON ELECTRICITY
In case of checking AMP board or DIGITAL board while turning on electricity, please connect with an crocodile clip connector between back
panel and chassis.
AMP board
back panel
DIGITAL board 
insulating sheet
AMP board
DIGITAL board
chassis 
back panel
crocodile clip connector
4
STR-DB900
1-3. NOTE ON AMP BOARD REMOVAL
1-4. NOTE ON HEAT SINK INSTALLATION
Be sure to install it in the direction as shown in the figure.
AMP board
In case of removing AMP board, 
remove these 6 screws first, it is 
easy to remove it.
heat sink
AMP board
insulating sheet
Page of 62
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Download Sony STR-DB900 Service Manual (Repair Manual)

Here you can read online and download Sony STR-DB900 Service Manual in PDF. STR-DB900 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony STR-DB900 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.