Sony STRDB-840, STRDB-940 Service manual
STR-DB840/DB940
SERVICE MANUAL
Photo: STR-DB940 (AEP and UK models) (Black type)
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 w orldwide patents issued and pending.
“DTS” an d “DTS Digital Surround” are tr ademarks of Digital Theater
Systems, Inc.
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
STR-DB840/DB940
E Model
Australian Model
Chinese Model
STR-DB940
– Continued on next page –
FM STEREO/FM-AM RECEIVER
• Abbreviation
AU : Australian model
CA : Canadian model
CED: AEP and UK models
CN : Chinese model
SP : E model
U : US model
2
SAFETY CHECK-OUT
Par t No.
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 leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a V OM
or battery-operated A C voltmeter . The “limit” indica tion 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)
To Exposed Metal
Parts on Set
MODEL IDENTIFICATION
– Rear View –
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
Part 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
1.5 k
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
Ω
Earth Ground
AC
voltmeter
(0.75 V)
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.
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 NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES 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.
3
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 Diag ram – DIGITAL Board (1/3) –.............. 15
4-6. Schematic Diag ram – DIGITAL Board (2/3) –.............. 16
4-7. Schematic Diag ram – 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
4
FRONT PANEL PARTS DESCRIPTION
SECTION 1
GENERAL
1
?/1
DIMMER
DISPLAY
SPEAKERS
A
B
OFF
•
•
•
+
B
A
•
PHONES
1 I/1 switch
2 MASTER VOLUME control
3 MUTING button
6
7
BASS BOOST
VIDEO 3 INPUT
8
2
MASTER VOLUME
5
•
•
•
•
•
•
46
MULTI CHANNEL DECODING
MEMORY
FM MODE
CINEMA STUDIO EX.
–
MODE–+SHIFT AB A.F.D.
SET UP
NAME
LEVEL
SUR
EQ
+
–
ENTER
EQUALIZER
+
INPUT
MODE
PRESET
– + C 2 CH ANLG DIRECT 5.1CH INPUTFM/ AM
TUNING
RLVIDEOS-VIDEO AUDIO
•
•
•
3
•
•
•
2
•
•
•
1
•
•
•
0
DOOR OPEN FUNCTION MUTING
•
•
•
7
•
•
•
8
•
•
•
9
•
•
•
10
MODE
345
4 FUNCTION control
MODE button
5 INPUT MODE button
9
q; qa
qs
qd
?/1
DIMMER
SPEAKERS
OFF
B
+
A
•
PHONES
DISPLAY
A
B
•
•
•
BASS BOOST
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
MULTI CHANNEL DECODING
MEMORY
FM MODE
whwj
CINEMA STUDIO EX.
–
wg
+
EQUALIZER
INPUT
MODE
wdwf
VIDEO 3 INPUT
PRESET
– + C 2 CH ANLG DIRECT 5.1CH INPUTFM/ AM
TUNING
RLVIDEOS-VIDEO AUDIO
ws
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)
SET UP
NAME
wa
SUR
w;
LEVEL
ql
EQ
qk
MASTER VOLUME
5
•
•
•
•
•
•
46
•
•
•
3
•
•
•
2
•
•
•
1
•
•
•
MODE– +SHIFT AB A.F.D.
+
–
ENTER
qj
qh
0
DOOR OPEN FUNCTION MUTING
qfqg
•
•
•
7
•
•
•
8
•
•
•
9
•
•
•
10
MODE
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
5
BACK PANEL PARTS DESCRIPTION
1 2 3 4
ANTENNA
FM
75Ω
COAXIAL
L
R
PHONOINCD
L
AM
R
FRONT
REAR
5.1CH INPUT
SIGNAL
GND
CTRL S
U
U
MONITOR
OUT
IN
MD/DAT
MD/DAT
OPTICAL
CENTER
SUB
WOOFER
CTRL S
STATUS IN
IN
S-VIDEO
OUT
VIDEO
OUT
IN
TAPE
OPTICAL
OPTICAL
IN
OUT
DIGITAL
S-VIDEO
S-VIDEO
IN
VIDEO
AUDIO
AUDIO
IN
IN
TV/SAT
DVD/LD
TV/SAT
MD/DAT
IN
VIDEO
DVD/LD
DVD/LD
OPTICAL
IN
COAXIAL
IN
BA
+
RLRL
CTRL S
CTRL S
OUT
OUT
S-VIDEO
VIDEO 2
VIDEO
AUDIO
OUT
IN
VIDEO
AUDIO
OUT
IN
VIDEO 1
IN
OUT
VIDEO
AUDIO
IN
OUT
S-VIDEO
IN
VIDEO
AUDIO
IN
–
CONTROL A1
L
R
2ND AUDIO OUT
ql 9
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)
qj CD jack
qk PHONO jack
ql MONITOR jack
REARFRONT CENTER
RL
SPEAKERS IMPEDANCE USE 4 – 16Ω
8q;qaqsqdqfqgqhqjqk 7
MD/TAPE jack (STR-DB840)
FRONT
REAR
L
R
PRE OUT
4 Ω 8 Ω
5
SUB WOOFER
AC OUTLET
CENTER
IMPEDANCE
SELECTOR
6
6
SECTION 2
s
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CASE
1 two screws
(flat head)
1 two screws
(flat head)
3 case ass'y
1 two screws
(flat head)
2
2
1 two screw
(flat head)
5.1 IN BOARD, AU SW BOARD, TUNER
2 connector
(CNP10)
5 5.1 IN board,
AU SW board
1 wire (flat type) (15 core)
(CN1)
4 tuner
(TM301)
3 four screws
(BV3 × 8)
7
VIDEO/OSD/JOINT (1) (Q)/JOINT (2) (Q)/S-VIDEO/
)
DIGITAL BOARDS
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)
1 wire (flat type) (15 core
(CN51)
5 bracket (digital)
6 connector
HEAT SINK
(CNS213)
2 three screws
(BV3 × 8)
7 seven screws
(BV3 × 8)
4 two screws
(BVTP3 × 8)
1 five connectors
(CNP511, 611, 561, 711, 761)
5 heat sink
4 two screws
(BVTP3 × 8)
3 two screws
(BVTP3 × 6)
2 ten screws
8
MAIN BOARD
s
2 connector
(CNS305)
4 three screws
(BVTP3 × 8)
5 MAIN board
3 six screw
(BV3 × 8)
1 wire (flat type) (23 core)
(CNS111)
9
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 star ts. If
the power `/1 b utton is pressed often the demonstration has
started, the power is turned off, and the demonstration resumes
if the power
ALL CLEAR mode; Press the [A.F.D.], [MODE +], and `/1
buttons.
`/1 button is pressed again.
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.
10
SECTION 4
DIAGRAMS
STR-DB840/DB940
4-1. BLOCK DIAGRAM – MAIN Section (1/2) –
TM301
1
13
15
9
11
3
5
3
5
13
3
5
13
9
6
J303
Y SWITCH
TV
LD
V1 I
C SWITCH
TV
LD
V1 I
TUNER UNIT
FM
AM
FM DET OUT
FM IF OUT
DO
TUNED
STEREO
DO
TUNED
STEREO
J302
LIN
LRECOUT
IC007
VIDEO SELECT
IC201
M OUT
V1 IN
V1 OUT
V2 IN
SW1
SW2
V2 OUT
SW3
SW4
TV
LD
SW5
IC252
V1 0
SW1
SW2
SW3
SW4
SW5
M 0
IC251
V1 0
SW5
SW1
SW2
SW3
SW4
M 0
MUTING
VCC
VEE
15
14
10
4
6
2
1
15
2
14
10
4
6
1
MUTING
DATA
S DATA
16
8
14
10
4
6
2
L OUT
R OUT
S CLK
D204
D205
CLOCK
CE
1321315144
S LAT
10
12
5
4
6
3
4
9
R CH
SELECT
SWITCH
IC1005
D201
EQ AMP
IC302
7
10
11
12
A
14
2
B
+5V
–5V
Y
C
J252-2
VIDEO 1
S-VIDEO OUT
Y
C
D202
J251
MONITOR
S-VIDEO OUT
05
(Page 12)
(AEP, UK)
(DB940)
(DB940)
(DB840)
VIDEO 1
VIDEO 2
TV/SAT
DVD/LD
TV/SAT
S-VIDEO IN
DVD/LD
S-VIDEO IN
VIDEO 1
S-VIDEO IN
E
TAPE
DVD/LD IN
TV/SAT IN
DAT/MD IN
MD/DAT OUT
MONITOR
VIDEO OUT
VIDEO IN
VIDEO OUT
VIDEO IN
VIDEO OUT
VIDEO IN
VIDEO IN
J253-1
J253-2
J252-1
FM
75Ω
AM
FM DET OUT
RSD SIGNAL
PHONO IN
(DB940)(DB840)
DAT/MDMD/TAPE
IN
RECOUT
DVD/LD INCOAX
Y
C
Y
C
Y
C
TM301
(ANTENNA)
IC001
IR LINK
IC002
IR LINK
IC003
IR LINK
IC004
IR LINK
J1001
J201
J202
J203
J301
L
LCD IN
L
L
DET
DET
DET
DET
J810-1
LAUDIOVIDEO 3 INPUT
(DB940)
SELECTOR
IC330
TUNER
26
CD
27
25
MD
TAPE
23
AUDIO SELECT
IC301
3
4
2
8
7
6
11 12
10
CONTROL
CE
CLK
DI
14 16
15
S LAT
S CLK
S DATA
A
B
A
DO
TUNED
S DATA
TMUTE
STEREO
58 59 60 84 112 110 111 109 11856 57 55 47 48 46 116 113 114 106 85 6
STEREO
AUTO STOP
TUNER MUTE
DATA
DATA
VIDEO
77
(SW1)
VIDEO
76
(SW2)
VIDEO
75
(SW3)
VIDEO
72
(SW4)
S CLK
CLOCK
B
S LAT
108 107
LATCH
DIG IN A
DIG IN B
COM
COM
COM
15 14 16
S CLK
S DATA
TV/SAT
DVD/LD
VIDEO2
VIDEO1
S CLK
S DATA
EV CLK
EV DATA
26
27
25
S LAT
DIGITAL AUDIO
I/F RECEIVER
S LAT
DI
EV STB
IC1101
IC309
RY301
Q301
RELAY
DRIVE
SELECTOR
IC1502
19
SELECTOR
J305
LINPUT
LINPUT
LOUTPUT
J304
LINPUT
LOUTPUT
LINPUT
3
D IN
36
DI
38
CLK
37
CE
48 17
CL
CE
IC303
27
26
25
27
26
25 17
CONTROL
CE
CLK
DI
14 1615
S LAT
S CLK
S DATA
16
DATA
13
CK OUT
14
BCK
15
LRCK
IC11404
5
AUTO
3
12.288MHz
DO
ERROR
22 8
12.288M
34
ERROR
35
DO
32
AUTO
XSTAT E
XMODE
XMODE
XSTAT E
IC1404
6
7
1
IC1404
X3501
Q1204
Q1203
D1202
ANALOG/DIG
CONTROLLER
IC1201 (1/2)
DIGITAL AUDIO DECODER
85
84
83
82
2
69 68 66 62
D1101
D SIG
S MUTE
SYSTEM
DOLBY
IC1301
DATA0
DATA1
SDIA1
SDIA0
DATA2
SDBCK0
SDWCK0
XI
SO
SCK
SICSIC
1 2 4 5
SICSIC
SCCLK
IC304
IC1504 IC1504
30
29
9
39
4
IC1202
XOXI
9293
HRDY
X1401
10MHz
Q1201
SOD
5
2
3
4
Q1202
AUDIO DSP
HA0
113
114
115
116
117
118
119
53
ı
69
76
ı
94
74
70
25
ı
31
39
ı
45
15
IC1202
10118
IC1401
BCK0
BCK1
LRCK0
LRCK1
SIA
SIB
SIC
ED16 – 31
CLKO
EA0 – 15
XWE
XOE
HRDY
HA0
XHDWR
9 14 26
9
XHDWR
SOA
SOB
SOC
CLKI
SOD
XHDCS
XRST
XRST
XHDCS
X1201
16MHz
2
3
4
99
100
5
13
IC1403
14
13
IC1403
12
11
IC1403
67
AU
24
IC1403
4
AU
23
5
3
2
AU
22
IC1403
SRAM
IC1402
D0 – 7
83
D0 – 7
3 25 13 16 26 27 15 31 30 29 28 32 35
24 – 17
HD0 – HD7
SO
AUDIO CODEC
IC1503
LIN+
LIN-
SDTO
MCLK1
BCLK
L OUT1
LRCK
L OUT3
R OUT3
SDTI 1
SDTI 2
L OUT2
SDTI 3
S MUTE
CDTI
CCLKCSPD
3 43 42 41 17 11
CS
CDTI
CCLK
S MUTE
PD
5.1CH INPUT
IC1507
5
27
23
3
24
25
DFS
Q1507
MUTE
DRIVE
AC MUTE
PROTECT
96kHZ
RY FRONT A
RY FRONT B
RY CENTER
RY WOOFER
RY REAR
RY PRE
DISP DATA
DISP CLK
DISP MR
RY POWER
(DB840)
5
5
IC1506
RY HP
SREQ
RESET
STOP
SOTO
SINO
MD2
MD0
SUB WOOFER
7
7
IC1505
1
IC1505
7
82
66
104
99
100
101
103
102
98
50
52
49
51
90
105
69
10
9
87
89
FRONT L
REAR L
CENTER
J307
18
20
23
26
3
21
27
2
24
2CH L
CDL
S.1-L
S.1-LS
S.1-C
S.1-C
L
C
W
LS
15 14 16
S CLK
S DATA
L OUT
C OUT
W OUT
LS OUT
S LAT
D1212
17
25
4
22
D1201
J306
R CH
IC1510
MUTE
Q1502
IC1508
MUTE
Q1505
IC1508
MUTE
Q1506
IC1509
MUTE
Q1503
• SIGNAL PATH
L
R
DATA
CLK
LAT
: FM
: PHONO
: CD
: DVD
AC MUTE
PROTECTOR
HP RY
SP/A RY
SP/B RY
RY CENTER
RY WOOFER
REAR SP RY
PRE RY
U DATA
U CLOCK
U MREQ
U SREQ
U REST
RESET
RY POWER
STOP
SOT0
SIN1
MD2
MD0
2ND
AUDIO
OUT
L
C
W
SL
B
(Page 13)
C
(Page 13)
D
(Page 13)
1111
STR-DB840/DB940
4-2. BLOCK DIAGRAM – MAIN Section (2/2) –
(DB940)
J810-2
VIDEO 3
INPUT
TV/SAT
DVD/LD
VIDEO 2
VIDEO 1
VIDEO
J2003
VIDEO IN
VIDEO IN
VIDEO OUT
J2002
VIDEO IN
VIDEO OUT
VIDEO IN
7
3
5
11
9
15
13
VIDEO SELECT
IC2005
V3
TV
LD
V2 OUT
V2 IN
V1 OUT
V1 IN3
16
VCC
8
VEE
14
SW1
10
SW2
4 75
SW3
6
SW4
2
SW5
1
M OUT
+5V
–5V
D2003 D2004
VIDEO (SW1)
77
76
VIDEO (SW2)
VIDEO (SW3)
VIDEO (SW4)
72
SYSTEM CONTROLLER
IC1201 (2/2)
VIDEO 3
INPUT
MONITOR
05
J809
S-VIDEO
J253-1
TV/SAT
S-VIDEO IN
J253-2
DVD/LD
S-VIDEO IN
J252-1
VIDEO 1
S-VIDEO IN
VIDEO OUT
Y
C
Y
C
Y
C
Y
C
J2001
(EXCEPT US, CND)
X2002
14MHz
13
X2001
17.34MHz
7
V3
3
TV
5
LD
13
V1 IN
7
V3
3
TV
5
LD
13
V1 IN
6
C OUT
8
Y OUT
7
V OUT
10 9 811
CLOCK
IC2001
12 1 2
CLOCK
IC2001
Y SWITCH
IC252
V1 OUT
C SWITCH
IC251
V1 OUT
VIDEO BUFFER
IC2002
FI2001
LPF
SW1
SW2
SW3
SW4
M OUT
SW1
SW2
SW3
SW4
M OUT
C IN
Y IN
V IN
15
14
10
4
6
1
15
14
10
4
6
1
4
2
3
5
6
4
1
3
2
COMPARATOR
(US,CND)
FI2003
9
10
IC2003
Y
J252-2
VIDEO 1
S-VIDEO OUT
C
Y
C
OSD DRIVER
IC2004
26
C OUT
27
Y OUT
25
V OUT
8
EXS
LPF
HSYNC
VSYNC
TEST
10
11 21
8
CNP253
(FOR CHECK)
VBLK
SCLK
SIN
YIN
VIN
CIN
EXHSYN
J251
MONITOR
S-VIDEO OUT
6
22
23
24
CS
1
3
2
12
Q2001, 2002
D2002
D2005
2
2
HSYNC
HSYNC
IC2006
SYNC
IC2008
SYNC
VSYNC
VSYNC
DISPLAY
CONTROLLER
IC102 (2/2)
(AEP, UK)
56
OSD VBLK
26
OSD CLK
28
OSD DOUT
100
OSD LAT
RDS
SIGNAL INPUT
46
RDS DECODER
IC1
RDS SIGNAL
E
(Page 11)
RDS DATA
53
54
RDS CLOCK
IN
1
55
4
IN
1
4
OSD VSYNC
P/N
57 13 14
16
RCLK
2
RDAT
XI XO
X1
4.332MHz
4MUX
FM DET OUT
1212
4-3. BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
STR-DB840/DB940
B
(Page 11)
05
L
C
W
SL
DATA
CLK
LAT
MM
(Page 11)
(Page 11)
(US, Canadian)
J257
TV/SAT
CTRL S
STATUS IN
J258
MONITOR
CTRL S
IN
J255
VIDEO 1
CTRL S
OUT
J256
DVD/LD
CTRL S
OUT
VOLUME
RV401
C
D
IC408
31
IC409
(1/2)
31
IC409
(2/2)
57
IC410
31
AC MUTE
PROTECTOR
HP RY
SP/A RY
SP/B RY
RY CENTER
RY WOOFER
REAR SP RY
PRE RY
RY POWER
STOP
RESET
URESET
USREQ
UMREQ
UCLOCK
UDATA
SOTO
SIN1
MD2
MD0
IC105
7
MOTOR
DRIVE
8
DATA
CLK
LAT
DATA
CLK
LAT
DATA
CLK
LAT
VOL CONT
IC414
IN
3
9
DATA
8
CLK
10
LAT
VOL CONT
IC415
IN
3
IN
14
9
DATA
8
CLK
10
LAT
VOL CONT
IC416
3
IN
9
DATA
8
CLK
10
LAT
3
2
BUFFER
Q201, 202
13
IN1
11
1
10
2
CONTROL S
IC253
OUT
OUT
OUT
OUT
MUTE DRIVE
Q501, 503
9
UP
10
DOWN
1
IN3
2
OUT1
I/O
2
2
15
2
95 96 93 94 18
6
4
7
2
POWER AMP (L)
IC501
+B
13
VCC
12
+VE
14
VCC
15
VEE
8
1
POWER AMP (C/W)
13
14
15
6
1
POWER AMP (SL)
13
14
15
8
1
51 20 19 61 62 60 59 88 87 89 90 82 83 98 99
MD2
FLASH DATA IN
FLASH DATA OUT
MBUS DVD
SIRCS IN
38 39 40 41 43 44 7 64 65 66 21 24 25 22
FUNCTION
KEY
S111 – 118
9
NF
IN
MUT
11
–VE
IC601
VCC
2
+VE
VCC
VEE
IN
5
NF
MUT
3
–VE
IC701
VCC
12
+VE
VCC
VEE
9
NF
IN
MUT
11
–VE
UDATA
UMREQ
UCLOCK
AD KEY1
AD KEY2
FUNCTION
KEY
S121 – 128
IC101
REMOTE
1 3
CONTROL
RECEIVER
Q604, Q605
Q704, Q705
USREQ
URESET
S131 – 133,
MBUS STA OUT
MBUS TV
–B
+B
–B
+B
–B
49
MD0
MBUS VIDEO 1
Q505
BIAS
BIAS
BIAS
RV101
79 78
DOWN
FUNCTION
AD KEY3
FUNCTION
KEY
141 – 145
BOOSTER
Q506
BOOSTER
Q507
BOOSTER
Q606
BOOSTER
Q607
BOOSTER
Q706
BOOSTER
Q707
RV102
JOG UP
JOG DOWN
FUNCTION UP
AD KEY4
FUNCTION
KEY
S151 – 153,
161, 162
B+ (5V)
CUR DET
Q508
CUR DET
Q608
CUR DET
Q708, Q798
D111 – 115
EQ
SUR
LEVEL
DISPLAY
CONTROLLER
IC102 (1/2)
AD KEY5
FUNCTION
KEY
S134, 135
NAME
SETUP
FUNCTION
S163, 164
PROTECTOR
Q547-549
AD KEY6
KEY
POWER
PROTECTOR
Q509,510
POWER
PROTECTOR
Q609,610
POWER
PROTECTOR
Q709,710
D121,
D136 – 140, 141
D147 – 157
1 – 7 9 – 15 20 – 29
LED DRIVER
IC108
LED CE
LED CLK
LED DATA
MUTING
D123
MUTING
LED CLR
SPEAKER A
SPEAKERS
S102
Q511
Q611
(DB940)
+B
SPEAKER B
(POWER)
POWER KEY
S101
I/1
SIRCS DET
Q129,130
LED
DRIVE
X101
16MHz
XO
FL CLK
FL LAT
30 31 32 28
LAT
CLK
IC103
FL DRIVE
F2
FL101
FLOURESCENT
INDICATOR TUBE
RELAY
DRIVE
Q601
RELAY
DRIVE
Q546
RELAY
DRIVE
Q596
IC11
XI
FL CLEAR
CLR
DIN
R CH
RY602
TM501
RY501
RY502
RY601
RELAY
DRIVE
Q645
RY681
RELAY
DRIVE
Q681
RY701
RELAY
DRIVE
Q745
RY671
RELAY
DRIVE
Q671
15 16
XI
LAT
5 14
LAT
67
X11
7.82MHz
XO
CA1 I
CA1 O
RESET
RESET
ABUS OUT
Q104
I/O
BUFFER
Q102
5V
CHECK
IC106
SIRCS
2
CARR OUT
SIRCS IN
33
FL DATA
5V CHECK
12
F1
11
12
R-CH
1358 75 76 1 2 3 4 5
POWER RY
63
R CH
R-CH
QQ11
CTL
I/O
RESET
STOP
ABUS A1 IN
D103
+5V
TM701
S (L)
S (R)
77
47
L
R
L
R
C
R
R
J701
PHONES
A
B
JJ102
CENTER
JJ101
SUB WOOFER
L
REAR
L
FRONT
D1209
FRONT
CENTER
REAR
SPEAKERS
PRE OUT
DISP µCOM+5.6V
RESET
Q103
+5V
+15V
–5V
–15V
+32V
+B
–B
TUNER +5V
IR LINK +5V
DIGITAL +5V
CONT µCOM ETC
D1211
IC404
+5V
REG
IC405
–5V
REG
Q801
+32V
REG
SWITCH
Q613
D1208
8 5
31
23
+6.2
REG
Q1205
3
RESET
IC1206
6
IC1203
IC1204
+24V
IC401
+15V
REG
–15V
REG
IC402
D801
IC1207
+15V
REG
IC1208
+5V
REG
+3.3V
REG
+5V
REG
+6.2V
REG
IC1205
D901-904
13
23
13
13
13
13
13
F801
F802
D802-805
D806-809
RY901
RELAY
DRIVE
Q901
T902
J204: DB840
J2004: DB940
CONTROL A1 II
S801
IMPEDANCE
SELECTOR
84
D812
D811
F803
F804
F805
F2
F1
T901
• SIGNAL PATH
F901
: FM
: CD
EXCEPT US,
Canadian
F903
JW925
(US, Canadian)
CNJ901
CNP901
AC IN
1313
4-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
• Circuit Boards Location
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
a
•
• 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.
: Through hole.
• Indication of transistor
C
Q
B
E
B
B
• Abbreviation
AUS : Australian model
CH : Chinese model
CND : Canadian model
These are omitted.
Q
CE
These are omitted.
Q
CE
These are omitted.
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
•
• 2 : nonflammable resistor.
• C : panel designation.
• U : B+ Line.
• V : B– Line.
• Voltages and waveforms are dc with respect to ground
• Voltages are taken with a VOM (Input impedance 10 MΩ).
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
• Abbreviation
: internal component.
Note:
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part
number specified.
under no-signal (detuned) conditions.
no mark : FM
Voltage variations may be noted due to normal production tolerances.
Voltage variations may be noted due to normal production tolerances.
F : FM
J : CD
I : PHONO
AUS : Australian model
CH : Chinese model
CND : Canadian model
: Impossible to measure
∗
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
DISPLAY board
POWER board
VIDEO 3 board
SP board DC (2) board
AC board
DC (1) board
DIGITAL board
5.1 IN board
AU SW board
SW board
MUTING board
BIAS (C) board
BIAS (L) board
BIAS (R) board
BIAS (RS) board
BIAS (LS) board
H.P board
VOL board
MAIN board
S-VIDEO board
VIDEO board (DB840)/
OSD board (DB940)
JOINT (1) (Q) board (DB840)/
JOINT (2) (Q) board (DB940)
1414
4-5. SCHEMATIC DIAGRAM – DIGITAL Board (1/3) – • See page 42 for Waveforms. • See page 42 for IC Block Diagrams.
(Page 16)
STR-DB840/DB940
(Page 17)
(Page 27)
(Page 29)
(Page 29)
1515
(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.
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)
1616
4-7. SCHEMATIC DIAGRAM – DIGITAL Board (3/3) –• See page 42 for Waveform. • See page 42 for IC Block Diagrams.
STR-DB840/DB940
(Page 16)
(Page 25)
(Page 15)
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
1717
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.
STR-DB840/DB940
4-8. PRINTED WIRING BOARD – DIGITAL Board (Component Side) –• See page 14 for Circuit Boards Location.
(AEP, UK)
C7C6
C1
C5
C3
58
R3
12 9
1
16
R1
L1
C4
FB1
C2
R2
• Semiconductor Location
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
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. 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
1511
12
15
22
23 3330
44
40
34
1818
4-9. PRINTED WIRING BOARD – DIGITAL Board (Conductor Side) –• See page 14 for Circuit Boards Location.
STR-DB840/DB940
MAIN BOARD
CNS306
(Page 30)
DISPLAY BOARD
CNS101
(Page 28)
(AEP, UK)
S-VIDEO BOARD
CNS215
(DB940)
23
(US, CND)
(DB840)
DISPLAY BOARD
CNP107
(Page 28)(Page 26)
SW BOARD
CNP10
(Page 24)
DC (2) BOARD
CNP808
(Page 38)
• Semiconductor Location
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
1919
IC1203 J-14
IC1204 J-17
IC1205 F-14
IC1206 H-16
IC1207 H-14
IC1208 G-13
IC1501 J-15
IC1511 B-6
Q1205 G-17
STR-DB840/DB940
4-10. PRINTED WIRING BOARDS – VIDEO/JOINT (1) (Q) Boards (DB840) –• See page 14 for Circuit Boards Location.
(DB840)
CNS211
(Page 26)
TO
JOINT (1) (Q)
BOARD
2020
4-11. SCHEMATIC DIAGRAM – VIDEO/JOINT (1) (Q) Boards (DB840) –• See page 42 for IC Block Diagram.
STR-DB840/DB940
(Page 27)
2121
STR-DB840/DB940
4-12. PRINTED WIRING BOARDS – OSD/JOINT (2) (Q) Boards (DB940) – • See page 14 for Circuit Boards Location.
(DB940)
(Page 26)
CNS211
TO
JOINT (2) (Q)
BOARD
R2004
R2021
X2001
C2027
C2062
(EXCEPT US, CND)
C2008
(US, CND)
R2036
R2026
F12001
F12003
(US, CND)
JW2003
R2035
R2033
R2038
(EXCEPT US, CND)
C2021
C2022
C2055
• Semiconductor 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
Ref. No. Location
IC2004 C-5
IC2005 B-2
IC2006 B-5
IC2007
IC2008 B-4
Q2001 B-6
Q2002 C-5
DISPLAY BOARD
CNS102
2222
(Page 28)
4-13. SCHEMATIC DIAGRAM – OSD/JOINT (2) (Q) Boards (DB940) – • See page 42 for waveforms. • See page 42 IC Block Diagrams.
STR-DB840/DB940
(Page 29)
(Page 27)
2323
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)
(Page 19)
DIGITAL
BOARD
CNP7
5.1 IN BOARD
CNS301
CNP13
(Page 36)
4
1
(DB940)
(Page 30)
52
MAIN
BOARD
CNP302
(DB840)
MAIN BOARD
CNP301
(Page 30)
2424
4-15. SCHEMATIC DIAGRAM – AU SW Board – • See page 42 for IC Block Diagram.
STR-DB840/DB940
(Page 17)
(Page 32)
(Page 37)
(Page 31)
2525
STR-DB840/DB940
4-16. PRINTED WIRING BOARD – S-VIDEO Board – • See page 14 for Circuit Boards Location.
DIGITAL B0ARD
CNS1
(Page 19)
(DB840)
JOINT (1) (Q) BOARD
CNP211
(Page 20)
(DB840)
(DB840)
JOINT (2) (Q) BOARD
(DB940)
CNP211
(Page 22)
(DB940)
(DB940)
VIDEO 3 BOARD
CNP307
(Page 34)
2626
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