Sony STR-DB840,STR-DB940 Service Manual
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
US Model
Canadian Model
AEP Model
UK Model
STR-DB840/DB940
E Model
Australian Model
Chinese Model
STR-DB940
SPECIFICATIONS
STR-DB840/DB940
Photo: STR-DB940 (AEP and UK models) (Black type)
– Continued on next page –
Manufactured under license from Dolby laboratories. “Dolby”, “AC3”, “Pro Logic” and the doub le-D symbol ; are trademarks of Dolby
Laboratories.
Manufactured under license from Digital Theater Systems, Inc. US
Pat. No. 5,451,942 and other worldwide patents issued and pending.
“DTS” an d “DTS Digital Surround” are trademarks of Digital Theater
Systems, Inc.
2
• Abbreviation
AU : Australian model
CA : Canadian model
CED: AEP and UK models
CN : Chinese model
SP : E model
U : US model
3
MODEL IDENTIFICATION
– Rear View –
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.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering or
unsoldering.
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15 µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leaka ge tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.
2. A battery-operated A C milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated A C voltmeter . The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V A C range are suitable. (See Fig. A)
Par t No.
Model
DB940: US model
DB940: Canadian model
E model
Chinese model
Australian model
DB940: AEP and UK models
DB840: US model
DB840: AEP and UK models
DB840: Canadian model
Par t No.
4-227-151-0s
4-227-151-1s
4-227-151-2s
4-227-151-3s
4-227-151-4s
4-227-151-5s
4-227-151-7s
4-227-151-8s
4-227-151-9s
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
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
5
SECTION 1
GENERAL
FRONT PANEL PARTS DESCRIPTION
1
2
345
5
0
1
3
9
7
46
2
8
10
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
PHONES
SPEAKERS
A
OFF
A
+
B
B
MASTER VOLUME
DIMMER
DISPLAY
VIDEO 3 INPUT
RLVIDEOS-VIDEO AUDIO
FM MODE
–
BASS BOOST
MEMORY
MULTI CHANNEL DECODING
+
–
•
•
•
•
ENTER
DOOR OPEN FUNCTION MUTING
– + C 2 CH ANLG DIRECT 5.1CH INPUTFM/ AM
PRESET
TUNING
CINEMA STUDIO EX.
MODE–+SHIFT AB A.F.D.
INPUT
MODE
SET UP
NAME
LEVEL
EQ
+
EQUALIZER
SUR
MODE
?/1
5
0
1
3
9
7
46
2
8
10
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
PHONES
SPEAKERS
A
OFF
A
+
B
B
MASTER VOLUME
DIMMER
DISPLAY
VIDEO 3 INPUT
RLVIDEOS-VIDEO AUDIO
FM MODE
–
BASS BOOST
MEMORY
MULTI CHANNEL DECODING
+
–
•
•
•
•
ENTER
DOOR OPEN FUNCTION MUTING
– + C 2 CH ANLG DIRECT 5.1CH INPUTFM/ AM
PRESET
TUNING
CINEMA STUDIO EX.
MODE– +SHIFT AB A.F.D.
INPUT
MODE
SET UP
NAME
LEVEL
EQ
+
EQUALIZER
SUR
MODE
?/1
6
qfqg
7
8
9
q; qa
qs
qd
qh
qj
qk
ql
w;
wa
ws
wdwf
wg
whwj
1 I/1 switch
2 MASTER VOLUME control
3 MUTING button
6 DIMMER button
7 DISPLAY button
8 FM/AM button
SHIFT button
PRESET TUNING +/– buttons
9 CINEMA STUDIO EX. A~C buttons
q; MULTI CHANNEL DECODING
indicator
qa A.F.D. button/indicator
2CH button/indicator
MODE +/– buttons/indicator
qs ANLG DIRECT button
qd 5.1CH INPUT button
qf DOOR OPEN button
qg ENTER button
qh Cursor buttons (</>)
qj Jog dial
qk LEVEL button
ql EQ button
w; SUR button
wa SET UP button
ws NAME button
wd EQUALIZER button
wf TUNING/PTY SELECT +/– buttons
(AEP and UK models)
TUNING +/– buttons
(Except AEP and UK models)
4 FUNCTION control
MODE button
5 INPUT MODE button
wg RDS EON button
(AEP and UK models)
RDS PTY button
(AEP and UK models)
TEST TONE button
(Except AEP and UK models)
SLEEP button
(Except AEP and UK models)
wh MEMORY button
FM MODE button
wj SPEAKERS selector
PHONES jack
6
BACK PANEL PARTS DESCRIPTION
1 2 3 4
8q;qaqsqdqfqgqhqjqk 7
5
ql 9
6
4 Ω 8 Ω
BA
RLRL
–
IN
L
R
L
R
OUT
SIGNAL
GND
COAXIAL
AM
U
U
ANTENNA
TAPE
IMPEDANCE
SELECTOR
IN
PHONOINCD
REARFRONT CENTER
MONITOR
IN
OUT
MD/DAT
AUDIO
IN
IN
VIDEO
CTRL S
OUT
OUT
VIDEO
CTRL S
OUT
CTRL S
STATUS IN
CTRL S
IN
AUDIO
OUT
VIDEO 1
AUDIO
IN
TV/SAT
AUDIO
IN
DVD/LD
AUDIO
IN
AUDIO
OUT
VIDEO 2
FM
75Ω
AC OUTLET
FRONT
DVD/LD
OPTICAL
IN
DVD/LD
COAXIAL
IN
TV/SAT
OPTICAL
IN
MD/DAT
OPTICAL
IN
MD/DAT
OPTICAL
OUT
DIGITAL
L
R
REAR
FRONT
CENTER
SUB
WOOFER
5.1CH INPUT
VIDEO
S-VIDEO
IN
VIDEO
S-VIDEO
IN
2ND AUDIO OUT
CONTROL A1
VIDEO
S-VIDEO
IN
VIDEO
S-VIDEO
OUT
VIDEO
S-VIDEO
OUT
SPEAKERS IMPEDANCE USE 4 – 16Ω
RL
+
L
R
PRE OUT
REAR
SUB WOOFER
CENTER
1 ANTENNA terminal
2 5.1CH INPUT jack
3 DIGITAL jack
4 SPEAKERS terminal
5 PRE OUT jack
6 IMPEDANCE SELECTOR switch
7 AC OUTLET connector
8 AC power cord
9 CONTROL A1II jack
q; 2ND AUDIO OUT jack (STR-DB940)
qa VIDEO 1 jack
qs VIDEO 2 jack
qd DVD/LD jack
qf TV/SAT jack
qg TAPE jack (STR-DB940)
qh MD/DAT jack (STR-DB940)
MD/TAPE jack (STR-DB840)
qj CD jack
qk PHONO jack
ql MONITOR jack
7
CASE
5.1 IN BOARD, AU SW BOARD, TUNER
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
1 two screws
(flat head)
1 two screws
(flat head)
3 case ass'y
2
2
1 two screws
(flat head)
1 two screw
s
(flat head)
3 four screws
(BV3 × 8)
1 wire (flat type) (15 core)
(CN1)
4 tuner
(TM301)
5 5.1 IN board,
AU SW board
2 connector
(CNP10)
8
VIDEO/OSD/JOINT (1) (Q)/JOINT (2) (Q)/S-VIDEO/
DIGITAL BOARDS
HEAT SINK
1 wire (flat type) (15 core
)
(CN51)
5 bracket (digital)
1 wire (flat type) (21 core)
(CN55)
4 DIGITAL board
8 VIDEO board (DB840)/OSD board (DB940),
JOINT (1) (Q) board (DB840)/
JOINT (2) (Q) board (DB940)
S-VIDEO board
3 two screws
(BVTP3 × 8)
2 three screws
(BV3 × 8)
7 seven screws
(BV3 × 8)
6 connector
(CNS213)
1 five connectors
(CNP511, 611, 561, 711, 761)
3 two screws
(BVTP3 × 6)
4 two screws
(BVTP3 × 8)
4 two screws
(BVTP3 × 8)
2 ten screws
5 heat sink
9
MAIN BOARD
3 six screw
s
(BV3 × 8)
4 three screws
(BVTP3 × 8)
2 connector
(CNS305)
5 MAIN board
1 wire (flat type) (23 core)
(CNS111)
10
SECTION 3
TEST MODE
Fluorescent Indicator Tube Test Mode
All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
Procedure:
1. While depressing, the [A.F.D.] and the [DIMMER] buttons si-
multaneously, press the po wer `/1 button to turn on the main
power.
2. All segments turn on at the same time, then each segment turns
on press the [A.F.D.] button.
Factory Set Mode
All preset contents are reset to the default setting.
Procedure:
1. While depressing the [SET UP], and the [DIMMER] buttons
simultaneously, press the power `/1 button to turn on the
main power. The message Factry Set appears and the present
contents are reset to the default values.
All Clear Mode
All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
Procedure:
1. While depressing the [SET UP] button simultaneously, press
the power `/1 button to turn on the main power. The machine enters the DEMO mode.
DEMO mode: Wait a while, then the demonstration starts. If
the power `/1 button is pr essed often the demonstration has
started, the power is turned off, and the demonstration resumes
if the power
`/1 button is pressed again.
ALL CLEAR mode; Press the [A.F.D.], [MODE +], and `/1
buttons.
Sound Field Clear Mode
The preset sound field is cleared when this mode is activ ated. Use
this mode before returning the product to clients upon completion
of repair.
Procedure:
1. While depressing the [MODE +] button, press the po wer `/1
button to turn on the main power. The message S.F Initialize
appears and initialization is performed.
AM Channel Step 9 kHz/10 kHz
Selection Mode (US and Canadian Models)
Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
Procedure:
1. Set the FUNCTION to AM. Turn off the main power.
2. While depressing the [TUNING -] button or the [PRESET
TUNING +] button, press the power `/1 button to turn on the
main power.
3. Either the message AM 9kHz Step or AM 10kHz Step appears.
Select the desired step.
DSP Test Mode
It tests whether the DSP works correctly or not. When the DSP
test is activated, the test data is output from the DSP (IC1401:
CXD2712R) of the DIGITAL board and is written in the RAM
(IC1402: IDT71V016S). When the test data is read from the RAM
by the DSP , the data output must be equi valent to the original data.
If they disagree, an error is triggered. Errors can be caused by the
broken data line or defective soldering.
Procedure:
1. While pressing the [MODE +] and [DIMMER] buttons, press
the `/1 button to enter the DSP test mode.
2. The message DSP TEST MODE appears. When an error occurs, the message DSP2 ERROR is displayed. When there is
no error, the message DSP2 NO ERROR appears and the 1
kHz signal is output to all channels.
3. Use the [MUTING] button, when selecting the SINE WAVE,
THROUGH, or IMPLUSE mode.
Version Mode
When this mode is used, the microprocessor version number is
displayed.
Procedure:
1. Press the `/1 button while pressing the [MUTING], and
[DIMMER] buttons to turn on the power. The microprocessor
version number appears as follows.
1111
STR-DB840/DB940
L
DATA
FM
AM
FM
75Ω
AM
DO
TUNED
MUTING
STEREO
DATA
CLOCK
CE
L OUT
R OUT
TM301
TUNER UNIT
FM DET OUT
RSD SIGNAL
DO
TUNED
MUTING
STEREO
S DATA
S CLK
S LAT
R CH
PHONO IN
(DB940)(DB840)
(DB940)
(DB840)
LCD IN
J301
LIN
LRECOUT
J302
J1001
DAT/MDMD/TAPE
M OUT
J201
MONITOR
J202
J203
VIDEO 1
V1 IN
V1 OUT
V2 IN
V2 OUT
TV
LD
VEE
VCC
SW1
SW2
SW3
SW4
VIDEO SELECT
IC201
+5V
–5V
D202
D201
D204
D205
CE
CLK
DI
AUDIO SELECT
IC301
MUTE
Q1502
S LAT
S CLK
S DATA
S LAT
S CLK
S DATA
EQ AMP
IC302
MUTE
Q1505
IC1508
MUTE
Q1506
VIDEO
(SW1)
SYSTEM
CONTROLLER
IC1201 (1/2)
VIDEO
(SW2)
VIDEO
(SW3)
VIDEO
(SW4)
AUTO STOP
STEREO
TUNER MUTE
S DATA
S CLK
S LAT
DO
TUNED
STEREO
TMUTE
DATA
CLOCK
LATCH
J810-1
LAUDIOVIDEO 3 INPUT
SELECTOR
IC303
L
TAPE
IN
L
Y
V1 0
LD
M 0
Y SWITCH
IC252
VIDEO 1
S-VIDEO OUT
MONITOR
S-VIDEO OUT
Y
C
C
C SWITCH
IC251
C
Y
J251
J253-2
J252-1
05
J303
V1 0
V1 I
M 0
V1 I
C
Y
J253-1
C
Y
LD
TV
TV
TM301
(ANTENNA)
IR LINK
DET
IC001
DVD/LD IN
IR LINK
DET
IC002
TV/SAT IN
IR LINK
DET
IC003
DAT/MD IN
IR LINK
DET
IC004
MD/DAT OUT
DVD/LD INCOAX
IC007
SW1
SW2
SW3
SW4
SW5
SW5
SW1
SW2
SW3
SW4
VIDEO OUT
SELECT
SWITCH
IC1005
B
A
B
A
DI
DIG IN A
DIG IN B
A
B
CL
CE
DO
DIGITAL AUDIO
I/F RECEIVER
IC1101
D IN
DI
CLK
CE
DATA
CK OUT
BCK
12.288M
ERROR
DO
X3501
12.288MHz
IC1404
IC1404
XI
SDIA0
SDIA1
SDWCK0
DOLBY
DIGITAL AUDIO DECODER
IC1301
AU
DATA0
AU
DATA1
AU
DATA2
SCK
SCCLK
SICSIC
SICSIC
SO
SO
D1202
ANALOG/DIG
ERROR
SRAM
IC1402
SIA
SIB
SIC
XWE
XOE
XHDWR
HA0
AUDIO DSP
IC1401
XHDWR
XHDCS
XRST
XHDCS
HRDY
XRST
HRDY
SOD
SOD
S MUTE
IC1202
IC1202
Q1201
Q1202
CDTI
CCLK
CS
PD
SOA
LRCK1
LRCK0
BCK1
SOB
SOC
L OUT1
LIN-
AUDIO CODEC
IC1503
S MUTE
CDTI
CCLKCSPD
SDTO
MCLK1
BCLK
LRCK
SDTI 1
SDTI 2
SDTI 3
LIN+
IC1504 IC1504
L OUT3
IC1508
IC1509
MUTE
Q1503
IC1510
R OUT3
L OUT2
IC1507
IC1505
IC1505
IC1506
MUTE
DRIVE
Q1507
Q1204
Q1203
U DATA
DISP DATA
DISP CLK
DISP MR
SREQ
SOTO
SINO
MD2
MD0
RESET
U CLOCK
U MREQ
U SREQ
SOT0
SIN1
MD2
MD0
U REST
RY POWER
RY POWER
AC MUTE
PROTECT
RY HP
RY FRONT A
RY FRONT B
RY CENTER
RY WOOFER
RY REAR
AC MUTE
PROTECTOR
HP RY
SP/A RY
SP/B RY
RY CENTER
RY WOOFER
REAR SP RY
PRE RY
XOXI
X1201
16MHz
STOP
STOP
IC11404
TUNER
CD
MD
TAPE
COM
COM
COM
S LAT
S CLK
S DATA
SELECTOR
IC330
SW5
S DATA
S CLK
S LAT
EV DATA
EV CLK
EV STB
IC309
AUTO
LRCK
SDBCK0
IC1403
IC1403
IC1403
BCK0
IC1403
IC1403
DFS
CLKI
CLKO
X1401
10MHz
RELAY
DRIVE
Q301
SELECTOR
IC1502
2CH L
CDL
S.1-L
S.1-LS
S.1-C
S.1-C
L
C
W
LS
L OUT
C OUT
W OUT
LS OUT
S LAT
S CLK
S DATA
RY301
J306
2ND
AUDIO
OUT
L
R
R CH
L
C
W
SL
DATA
CLK
LAT
XMODE
XSTATE
XMODE
XSTATE
AUTO
S MUTE
RESET
D1201
D1212
IC304
96kHZ
D SIG
1321315144
10
12
FM DET OUT
FM IF OUT
9
6
(DB940)
RECOUT
LINPUT
LINPUT
J305
LOUTPUT
TV/SAT
DVD/LD
VIDEO2
VIDEO OUT
VIDEO IN
VIDEO 1
VIDEO 2
VIDEO OUT
VIDEO IN
VIDEO IN
VIDEO IN
TV/SAT
S-VIDEO IN
TV/SAT
S-VIDEO IN
S-VIDEO IN
DVD/LD
DVD/LD
(DB940)
CONTROL
CE
CLK
DI
LINPUT
LOUTPUT
J304
LINPUT
VIDEO1
CONTROL
D1101
6
2
1
7
5
3
2
4
67
3
5
53
ı
69
76
ı
94
ED16 – 31
EA0 – 15
25
ı
31
39
ı
45
D0 – 7
D0 – 7
24 – 17
HD0 – HD7
HA0
10118
9
5
5
5
3
7
7
7
1
SUB WOOFER
5.1CH INPUT
(DB840)
CENTER
REAR L
FRONT L
J307
B
C
D
• SIGNAL PATH
: FM
: PHONO
: DVD
: CD
J252-2
26
27
25
26
27
25
23
3
4
2
8
7
6
11 12
14 16
3
36
38
37
15
10
15 14 16
5
7
10
11
12
2
14
4
6
3
4
9
72
75
76
77
1
13
15
16
8
14
10
4
6
2
5
3
15
14
10
4
6
2
1
15
2
14
10
4
6
1
13
5
3
13
9
11
3
5
58 59 60 84 112 110 111 109 11856 57 55 47 48 46 116 113 114 106 85 6
32
48 17
35
34
22 8
82
83
24
23
22
113
114
115
116
117
74
70
15
9 14 26
2
3
4
99
5
13
100
2
27
19
18
20
23
26
3
21
17
25
4
22
27
2
24
15 14 16
23
24
25
5
4
39
9
29
30
3
4
118
119
83
84
85
15
14
13
16
1 2 4 5
69 68 66 62
3 25 13 16 26 27 15 31 30 29 28 32 35
82
66
51
90
105
69
10
9
87
89
9293
104
99
100
101
103
102
50
RY PRE
98
52
49
3 43 42 41 17 11
108 107
27
26
25
27
26
25 17
14 1615
14
12
13
11
(Page 13)
(Page 13)
E
(Page 12)
(AEP, UK)
(Page 13)
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM – MAIN Section (1/2) –
1212
STR-DB840/DB940
4-2. BLOCK DIAGRAM – MAIN Section (2/2) –
VIDEO SELECT
IC2005
Y SWITCH
IC252
C SWITCH
IC251
VIDEO BUFFER
IC2002
X2002
14MHz
CLOCK
IC2001
05
J810-2
(DB940)
J2003
J2002
VCC
VEE
+5V
–5V
SW1
16
8
14
V1 OUT
15
3
TV
7
V3
5
LD
13
V1 IN1M OUT
6
SW4
4
SW3
10
SW2
14
SW1
Y
C
V1 OUT
15
3
TV
5
LD
13
V1 IN1M OUT
6
SW4
4
SW3
10
SW2
14
SW1
C IN
10 9 811
4
Y IN
2
V IN
3
6
C OUT
8
Y OUT
7
V OUT
VBLK
6
26
C OUT
27
Y OUT
25
V OUT
8
10
EXS
HSYNC
VSYNC
TEST
SW2
SW3
SW4
D2003 D2004
VIDEO (SW1)
SYSTEM CONTROLLER
IC1201 (2/2)
VIDEO (SW2)
VIDEO (SW3)
VIDEO (SW4)
10
4 75
76
77
72
6
SW5
M OUT
V3
TV
LD
V2 OUT
V2 IN
V1 OUT
V1 IN3
2
1
7
3
5
11
9
15
13
VIDEO IN
VIDEO IN
VIDEO OUT
VIDEO IN
VIDEO OUT
VIDEO IN
VIDEO
VIDEO 3
INPUT
TV/SAT
S-VIDEO IN
TV/SAT
DVD/LD
J2001
VIDEO OUT
MONITOR
VIDEO 1
VIDEO 2
Y
C
Y
J253-1
Y
C
S-VIDEO
VIDEO 3
INPUT
J809
S-VIDEO IN
DVD/LD
J253-2
S-VIDEO IN
VIDEO 1
J252-1
C
Y
C
S-VIDEO OUT
VIDEO 1
J252-2
SCLK
22
SIN
23
CS
24
OSD VBLK
56
OSD CLK
26
OSD DOUT
28
OSD VSYNC
P/N
55
54532
16
46
57 13 14
OSD LAT
DISPLAY
CONTROLLER
IC102 (2/2)
100
YIN
1
VIN
3
CIN
2
EXHSYN
CNP253
(FOR CHECK)
12
IN
VSYNC
D2002
D2005
IC2008
SYNC
IC2006
SYNC
Q2001, 2002
HSYNC
2
1
4
Y
C
S-VIDEO OUT
MONITOR
J251
OSD DRIVER
IC2004
11 21
IN
VSYNC
HSYNC
2
1
4
X2001
17.34MHz
CLOCK
IC2001
12 1 2
8
9
10
13
COMPARATOR
IC2003
7
V3
LPF
LPF
(US,CND)
(EXCEPT US, CND)
3
1
2
6
5
4
FI2001
FI2003
RDS DATA
RDS CLOCK
RDAT
X1
4.332MHz
RCLK
RDS
SIGNAL INPUT
4MUX
RDS DECODER
IC1
(AEP, UK)
RDS SIGNAL
FM DET OUT
(Page 11)
E
XI XO
1313
STR-DB840/DB940
4-3. BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
B
C
D
3
9
8
10
3
2
13
14
15
8
1
13
14
15
6
1
3
5
2
11
9
12
2
15
2
14
9
8
10
3
9
8
10
VEE
VCC
IN
MUT
+VE
NF
–VE
VCC
POWER AMP (L)
IC501
+B
–B
13
14
15
8
1
49
95 96 93 94 18
9
13
6
4
1032
7
8
51 20 19 61 62 60 59 88 87 89 90 82 83 98 99
5 14
15 16
33
2
12
11
1358 75 76 1 2 3 4 5
11
9
12
VEE
VCC
IN
MUT
+VE
NF
–VE
VCC
POWER AMP (SL)
IC701
+B
–B
BOOSTER
Q506
BOOSTER
Q507
CUR DET
Q508
POWER
PROTECTOR
Q509,510
Q511
VEE
IN
+VE
NF
–VE
VCC
POWER AMP (C/W)
IC601
+B
–B
MUT
BOOSTER
Q606
BOOSTER
Q607
CUR DET
Q608
POWER
PROTECTOR
Q609,610
Q611
BOOSTER
Q706
BOOSTER
Q707
CUR DET
Q708, Q798
RY602
RY501
RY502
RY601
RY681
RY901
JJ101
C
S (L)
S (R)
R-CH
CENTER
REAR
SUB WOOFER
J701
TM701
FRONT
TM501
R CH
R CH
RESET
IC1206
D801
PROTECTOR
Q547-549
F2
F1
F801
F802
D802-805
+B
–B
84
S801
F901
D901-904
CNP901
AC IN
L
R
VCC
F803
F804
+24V
CNJ901
T902
DISPLAY
CONTROLLER
IC102 (1/2)
STOP
AC MUTE
PROTECTOR
RESET
POWER KEY
F2
F1
05
JW925
STOP
RESET
TV/SAT
CTRL S
STATUS IN
MONITOR
CTRL S
IN
VIDEO 1
CTRL S
OUT
DVD/LD
CTRL S
OUT
J204: DB840
J2004: DB940
J256
J255
J258
J257
CONTROL S
I/O
IC253
11
10
+5V
REG
IC404
–15V
+15V
+5V
+32V
Q801
F805
T901
F903
(US, Canadian)
LED CLR
HP RY
SP/A RY
SP/B RY
RY CENTER
RY WOOFER
REAR SP RY
PRE RY
ABUS A1 IN
ABUS OUT
FL101
FLOURESCENT
INDICATOR TUBE
LAT
CLK
CLR
DIN
FL CLK
FL LAT
FL CLEAR
FL DATA
SPEAKER B
SPEAKER A
AD KEY6
AD KEY1
AD KEY2
AD KEY3
AD KEY4
AD KEY5
MD0
LED CE
LED CLK
LED DATA
SUR
EQ
D111 – 115
SETUP
NAME
LEVEL
MBUS DVD
SIRCS IN
MBUS VIDEO 1
MBUS STA OUT
MBUS TV
UP
DOWN
MOTOR
DRIVE
IC105
MD2
FLASH DATA IN
FLASH DATA OUT
UDATA
UCLOCK
UMREQ
URESET
URESET
UMREQ
UCLOCK
UDATA
SOTO
SIN1
MD2
MD0
XO
XO
XI
XI
CARR OUT
IC106
SIRCS
CTL
I/O
IC11
QQ11
+B
Q129,130
SIRCS IN
CA1 I
RESET
CA1 O
IC103
FL DRIVE
RY POWER
IC408
VOLUME
RV401
L
C
W
SL
IN
DATA
CLK
LAT
OUT
DATA
CLK
LAT
IN
DATA
CLK
LAT
OUT
DATA
CLK
LAT
IN
OUT
IC409
(1/2)
IC409
(2/2)
IN
DATA
CLK
LAT
OUT
DATA
CLK
LAT
IC410
VOL CONT
IC414
VOL CONT
IC415
VOL CONT
IC416
DATA
CLK
LAT
USREQ
USREQ
POWER
PROTECTOR
Q709,710
A
B
R
L
EXCEPT US,
Canadian
D806-809
D1208
D1211
POWER RY
RESET
LAT
LAT
D1209
X101
16MHz
X11
7.82MHz
(DB940)
BUFFER
Q201, 202
(US, Canadian)
JOG DOWN
JOG UP
RV102
79 78
FUNCTION UP
FUNCTION
DOWN
RV101
LED DRIVER
IC108
MUTING
Q604, Q605
BIAS
Q505
BIAS
Q704, Q705
BIAS
DIGITAL +5V
CONT µCOM ETC
DISP µCOM+5.6V
TUNER +5V
IR LINK +5V
31
31
31
57
RY701
RELAY
DRIVE
Q601
RELAY
DRIVE
Q546
RELAY
DRIVE
Q596
RELAY
DRIVE
Q645
RELAY
DRIVE
Q681
RELAY
DRIVE
Q745
JJ102
CENTER
REAR
FRONT
PHONES
SPEAKERS
RY671
RELAY
DRIVE
Q671
MUTE DRIVE
Q501, 503
MM
38 39 40 41 43 44 7 64 65 66 21 24 25 22
30 31 32 28
67
5V CHECK
12
47
77
63
IN1
1
2
1
IN3
7
2
2
OUT1
1 – 7 9 – 15 20 – 29
D121,
D136 – 140, 141
D147 – 157
LED
DRIVE
SIRCS DET
IMPEDANCE
SELECTOR
31
–5V
REG
IC405
–5V
R-CH
23
+15V
REG
IC401
13
–15V
REG
IC402
23
+5V
REG
IC1208
13
+15V
REG
IC1207
13
+3.3V
REG
IC1203
13
+5V
REG
IC1204
13
+6.2V
REG
IC1205
13
3
6
8 5
+32V
REG
SWITCH
Q613
RESET
Q103
+6.2
REG
Q1205
RELAY
DRIVE
Q901
CONTROL A1 II
FUNCTION
KEY
S111 – 118
FUNCTION
KEY
S121 – 128
FUNCTION
KEY
S131 – 133,
141 – 145
FUNCTION
KEY
S151 – 153,
161, 162
FUNCTION
KEY
S134, 135
FUNCTION
KEY
S163, 164
SPEAKERS
S102
I/O
BUFFER
5V
CHECK
Q104
Q102
D123
MUTING
S101
(POWER)
I/1
D103
+5V
1 3
IC101
REMOTE
CONTROL
RECEIVER
B+ (5V)
• SIGNAL PATH
: FM
: CD
(Page 11)
(Page 11)
(Page 11)
L
R
L
R
PRE OUT
D812
D811
1414
• Circuit Boards Location
4-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•f: internal component.
• 2 : nonflammable resistor.
• C : panel designation.
• U : B+ Line.
• V : B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
∗
: Impossible to measure
• Voltages are taken with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : FM
J : CD
I : PHONO
• Abbreviation
AUS : Australian model
CH : Chinese model
CND : Canadian model
Note:
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
C
B
These are omitted.
E
Q
B
These are omitted.
CE
Q
B
These are omitted.
CE
Q
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•a: Through hole.
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Indication of transistor
SP board DC (2) board
AC board
DIGITAL board
5.1 IN board
AU SW board
MUTING board
SW board
DISPLAY board
POWER board
DC (1) board
VIDEO 3 board
BIAS (C) board
BIAS (R) board
BIAS (RS) board
BIAS (LS) board
BIAS (L) board
S-VIDEO board
VIDEO board (DB840)/
OSD board (DB940)
JOINT (1) (Q) board (DB840)/
JOINT (2) (Q) board (DB940)
MAIN board
VOL board
H.P board
• Abbreviation
AUS : Australian model
CH : Chinese model
CND : Canadian model
1515
STR-DB840/DB940
4-5. SCHEMATIC DIAGRAM – DIGITAL Board (1/3) – • See page 42 for Waveforms. • See page 42 for IC Block Diagrams.
(Page 16)
(Page 17)
(Page 27)
(Page 29)
(Page 29)
(Page 39)
(Page 32)
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 0 sont
critiques pour la sécurité. Ne les remplacer que
par une pièce portant le numéro spécifié.
1616
STR-DB840/DB940
4-6. SCHEMATIC DIAGRAM – DIGITAL Board (2/3) –• See page 42 for Waveform. • See page 42 for IC Block Diagrams.
(Page 15)
(Page 17)
1717
STR-DB840/DB940
4-7. SCHEMATIC DIAGRAM – DIGITAL Board (3/3) –• See page 42 for Waveform. • See page 42 for IC Block Diagrams.
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 0 sont
critiques pour la sécurité. Ne les remplacer que
par une pièce portant le numéro spécifié.
(Page 16)
(Page 15)
(Page 25)
1818
STR-DB840/DB940
4-8. PRINTED WIRING BOARD – DIGITAL Board (Component Side) –• See page 14 for Circuit Boards Location.
D1212 B-1
IC1 B-7
IC1005 I-2
IC1007 I-1
IC1101 H-3
IC1201 D-4
IC1202 F-5
IC1301 H-5
IC1401 G-8
IC1402 I-8
Ref. No. LocationRef. No. Location
D1001 I-2
D1101 F-3
D1201 B-3
D1202 D-2
D1203 D-5
D1204 G-12
D1205 G-12
D1208 F-15
D1209 F-2
D1210 D-4
D1211 G-16
• Semiconductor Location
1
58
16
12 9
C7C6
R3
C1
C5
R1
C4
L1
FB1
R2
C3
C2
(AEP, UK)
1511
12
15
22
23 3330
34
40
44
Ref. No. Location
IC1403 J-7
IC1404 I-4
IC1503 I-11
IC1504 H-12
IC1554 G-11
Q1201 E-6
Q1202 E-6
Q1203 E-2
Q1204 E-2
1919
STR-DB840/DB940
4-9. PRINTED WIRING BOARD – DIGITAL Board (Conductor Side) –• See page 14 for Circuit Boards Location.
IC1204 J-17
IC1205 F-14
IC1206 H-16
IC1207 H-14
IC1208 G-13
IC1501 J-15
IC1511 B-6
Q1205 G-17
Ref. No. LocationRef. No. Location
D1206 F-14
D1207 F-13
D1502 I-11
D1503 I-11
IC1001 F-1
IC1002 E-1
IC1003 D-1
IC1004 C-1
IC1203 J-14
• Semiconductor Location
S-VIDEO BOARD
CNS215
DISPLAY BOARD
CNP107
(AEP, UK)
23
(US, CND)
(DB940)
(DB840)
DISPLAY BOARD
CNS101
MAIN BOARD
CNS306
SW BOARD
CNP10
DC (2) BOARD
CNP808
(Page 30)
(Page 28)
(Page 24)
(Page 38)
(Page 28)(Page 26)
2020
STR-DB840/DB940
4-10. PRINTED WIRING BOARDS – VIDEO/JOINT (1) (Q) Boards (DB840) –• See page 14 for Circuit Boards Location.
TO
JOINT (1) (Q)
BOARD
(DB840)
CNS211
(Page 26)
2121
STR-DB840/DB940
4-11. SCHEMATIC DIAGRAM – VIDEO/JOINT (1) (Q) Boards (DB840) –• See page 42 for IC Block Diagram.
(Page 27)
2222
STR-DB840/DB940
(DB940)
C2062
C2027
X2001
R2021
R2004
C2008
R2036
R2026
F12001
JW2003
R2035
C2021
C2022
R2033
F12003
R2038
(EXCEPT US, CND)
(US, CND)
(US, CND)
(EXCEPT US, CND)
TO
JOINT (2) (Q)
BOARD
C2055
DISPLAY BOARD
CNS102
CNS211
4-12. PRINTED WIRING BOARDS – OSD/JOINT (2) (Q) Boards (DB940) – • See page 14 for Circuit Boards Location.
IC2004 C-5
IC2005 B-2
IC2006 B-5
IC2007
IC2008 B-4
Q2001 B-6
Q2002 C-5
Ref. No. Location
Ref. No. Location
D2001 C-5
D2002 B-5
D2003 B-1
D2004 B-1
D2005 B-5
IC2001 C-1
IC2002 C-3
IC2003 C-3
• Semiconductor Location
(Page 26)
(Page 28)
2323
STR-DB840/DB940
4-13. SCHEMATIC DIAGRAM – OSD/JOINT (2) (Q) Boards (DB940) – • See page 42 for waveforms. • See page 42 IC Block Diagrams.
(Page 29)
(Page 27)
2424
STR-DB840/DB940
4-14. PRINTED WIRING BOARD – AU SW Board – • See page 14 for Circuit Boards Location.
• Semiconductor
Location
Ref. No. Location
D1501 H-2
D1504 H-3
D1505 H-4
IC1502 E-2
IC1505 B-4
IC1506 C-4
IC1507 D-4
IC1508 G-4
IC1509 G-3
IC1510 G-1
Q1501 H-2
Q1502 H-1
Q1503 H-3
Q1504 H-2
Q1505 H-4
Q1506 H-3
Q1507 I-5
(DB840)
(DB840)
DIGITAL
BOARD
CNP7
4
1
MAIN
BOARD
CNP302
CNP13
MAIN BOARD
CNP301
5.1 IN BOARD
CNS301
52
(DB940)
(Page 19)
(Page 36)
(Page 30)
(Page 30)
2525
STR-DB840/DB940
4-15. SCHEMATIC DIAGRAM – AU SW Board – • See page 42 for IC Block Diagram.
(Page 17)
(Page 32)
(Page 37)
(Page 31)
2626
STR-DB840/DB940
4-16. PRINTED WIRING BOARD – S-VIDEO Board – • See page 14 for Circuit Boards Location.
DIGITAL B0ARD
CNS1
(DB940)
(DB840)
(DB840)
(DB940)
VIDEO 3 BOARD
CNP307
JOINT (2) (Q) BOARD
CNP211
JOINT (1) (Q) BOARD
CNP211
(DB840)
(DB940)
(Page 19)
(Page 20)
(Page 22)
(Page 34)
Loading...