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STR-DB725/DB825
SERVICE MANUAL AEP Model
UK Model
Photo: STR-DB825
SPECIFICATIONS
-- Continued on next page --
FM STEREO/FM-AM RECEIVER
MICROFILM
1
TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 3
2. GENERAL .......................................................................... 4
3. DIAGRAMS
3-1. Circuit Boards Location ........................................................ 5
3-2. Block Diagrams
· Main Section ....................................................................... 7
· Power Section ..................................................................... 9
3-3. Schematic Diagram Video Input Section ...................... 13
3-4. Printed Wiring Board Video Input Section ................... 15
3-5. Schematic Diagram Input Section ................................ 17
3-6. Printed Wiring Board Input Section .............................. 19
3-7. Schematic Diagram S-Video Section ............................ 21
3-8. Printed Wiring Board S-Video Section ......................... 23
3-9. Schematic Diagram Speaker Section ............................ 25
3-10. Printed Wiring Board Speaker Section ...................... 27
3-11. Printed Wiring Board Display Section ....................... 29
3-12. Schematic Diagram Display Section ......................... 31
3-13. Schematic Diagram Front Panel Section ................... 33
3-14. Printed Wiring Board Front Panel Section ................. 35
3-15. Schematic Diagram Power AMP Section .................. 37
3-16. Printed Wiring Board Power AMP Section ................ 39
3-17. Schematic Diagram Trans Section ............................ 41
3-18. Printed Wiring Board Trans Section ........................... 42
3-19. IC Block Diagrams ........................................................... 43
3-20. IC Pin Functions ............................................................... 46
4. EXPLODED VIEWS
4-1. Case and Back Panel Section .............................................. 48
4-2. Front Panel Section ............................................................. 49
4-3. Chassis Section ................................................................... 50
5. ELECTRICAL PARTS LIST ........................................ 51
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
MODEL IDENTIFICATION
-- BACK PANEL --
Parts No.
PARTS No. MODEL
4-900-493-0 DB725
4-900-493-1 DB825
2
SECTION 1
SERVICING NOTE
FACTORY SET
Mode which sets the preset settings of the unit to that at shipment.
Procedure:
While pressing the < button and BASS BOOST button together, press the 1/u button to turn on the power.
"FACTORY" will be displayed and factory settings executed.
INITIALIZATION
Mode which erases all the preset settings of the unit.
Use this mode when returning the unit to the customer.
Procedure:
While pressing the MEMORY button and MUTING button together, press the 1/u button to turn on the power.
"ALL CLEAR" will be displayed and initialization executed.
FLUORESCENT INDICATOR TUBE AND LED LIGHTING CHECK
Mode which lights up the whole fluorescent indicator tube or partially.
Procedure:
While pressing the button and BASS BOOST button together, press the 1/u button to turn on the power.
The whole fluorescent display tube lights up.
The fluorescent display tube and LED light up in the following sequence each time the FUNCTION knob is rotated.
The fluorescent display tube: All light up
LED: VIDEO 1 , VIDEO 3 , TAPE/MD ,
5.1/DVD INPUT , MASTER VOLUME
and SURROUND light
Turn the FUNCTION knob
The fluorescent display tube: Light up partially (1)
LED: TV/LED , CD , PHONO ,
TONE , BASS/TREBLE and
MASTER VOLUME light
Turn the FUNCTION knob
The fluorescent display tube: Light up partially (2)
LED: VIDEO 2 , TUNER , BASS BOOST ,
INDEX , MASTER VOLUME and
MUTING light
Turn the FUNCTION knob
The fluorescent display tube: All lights out
LED: All lights out
Turn the FUNCTION knob
KEY CHECK
Mode for checking key input.
Procedure:
Turn on the power by pressing the 1/u button while pressing the button and the BASS BOOST button. "REST 25 KEY" is displayed.
The count decreases each time the button is pressed.
Buttons counted once will not be couned again.
"REST 00 KEY" is displayed when all the buttons are pressed.
3
SECTION 2
GENERAL
Front Panel Descriptions
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15
45
16
44
43
36 35 34 33 30 29 28 27 26 22 21 20 19 18 17
42 41
40 39 38 37 32 31 25 24 23
LOCATION OF PARTS AND CONTROLS
1 1/u (power) switch 23 BASS BOOST button
2 DISPLAY button 24 TONE ON/OFF button
3 FM/AM button 25 5.1/DVD INPUT button
4 VIDEO 1 indicator 26 BASS/TREBLE indicator
5 VIDEO 2 indicator 27 INDEX indicator
6 VIDEO 3 indicator 28 SET UP button
7 TV/LD indicator 29 Digital Processing Controls
8 TAPE/MD indicator 30 CURSOR MODE button
9 Display window 31 RDS EON button
10 CD indicator 32 RDS PTY button
11 SURROUND indicator 33 VIDEO 3 INPUT AUDIO R connecot
12 TUNER indicator 34 VIDEO 3 INPUT AUDIO L connecot
13 PHONO indicator 35 VIDEO 3 INPUT VIDEO connecot
14 5.1/DVD INPUT indicator 36 VIDEO 3 INPUT S-VIDEO connecot
TONE indicator 37 TUNING + button
BASS BOOST indicator 38 TUNING button
15 MASTER VOLUME knob 39 FM MODE button
16 MUTING button and indicator 40 MEMORY button
17 FUNCTION knob 41 PRESET TUNING + button
18 MODE switch 42 PRESET TUNING button
19 BALANCE knob 43 SHIFT button
20 SOUND FIELD ON/OFF button 44 PHONES jack
21 SOUND FIELD MODE button 45 SPEAKERS selector switch
22 SOUND FIELD GENRE button
4
SECTION 3
DIAGRAMS
3-1. CIRCUIT BOARDS LOCATION
SP board
S VIDEO board
H.P board
VIDEO board
VIDEO (3) board SURR board
BALANCE board
VOLUME board
STANDBY board STANDBY (2) board
AMP board
REAR AMP board
DISPLAY board
CONNECTOR board
SP SWITCH
board
SW board INPUT board
FUNCTION board
5
STR-DB725/DB825
3-2. BLOCK DIAGRAMS
MAIN SECTION
DOLBY PROLOGIC SURROUND
TUNER UNIT IS SUPPLIED AS THE ASSEMBLED BLOCK AUDIO SELECT MATRIX DECODER PROCESSOR SELECTOR
IC302 IC401 IC400 IC403
LINE AMP L.P.F
TUNER UNIT IC404 L OUT L OUT IC306
FM 3 1 3
75 FM L OUT 3 4 9 41 11 22 30 28 1 RY301
2 BALANCE VOLUME
S OUT
20k 5k/7k VOL/ SL OUT 29 MUTE RV402 RV401
AM AM R OUT R CH 2 39 13 ADM 20
STEREO
L.P.F L.P.F MUTE Q300
TMUTE
ASTOP
RDS 27 25
DATA
CLK
DO
CE
1 C OUT L
DEC 26 IC304
38
3 1
10 11 24 22
AUTO STOP
CLK
S DATA
EN
RDS DATA
DI
S CLK
CONTROL C
S LAT
RDS CLK
STEREO
RDS SM
23
TMUTE
MUTE
AUDIO OUT 9 3 2 4
Q304
DO
CONTROL
DATA
CLK
EN
J201 EQ AMP
6 8 A
S DATA
S CLK
D LAT
IC303 46 47 45
CLK
POWER
LAT
3 1
DI
PHONO L CONTROL W SECTION
MUTE
14 15 13
Q305
S DATA
IC305
S CLK
D LAT
CLK
5 7
CE
DI
CD L
S DATA
S CLK
S LAT
14 15 13 SL
MUTE
J202 LINE AMP Q302
IC301
IN L
S DATA
3 1
S CLK
S LAT
TONE CONTROL
TAPE/MD
IC502 UP
REC OUT L
BASS 3 M
AUDIO SELECT DOWN
IC300
J300 RDS DECODER 2
IC452 4
TV/LD AUDIO IN L 1 4
RDS DATA 5 · RCH is omitted
2
AUDIO IN L 7 · Signal Path
4 RDS CLK TREBLE 6
VIDEO2
16 : FM
AUDIO OUT L 6 8 MUTE SW
LEVEL SHIFT
13 14 Q411
: PHONO
J301
CLK
STB
DI
Q414
AUDIO IN L 10 11 X450 BOOST : CD
9 8 10
VIDEO1 4.43MHz +5V DET
AUDIO OUT L 9 Q501,502
: VIDEO
S DATA
S CLK
T LAT
CONTROL
CLK
CE
DI
D136
LED SW LED SW
14 15 13
Q108 Q143
S DATA