Sony STR-DB840 / STR-DB940 Service Manual ▷ View online
13
13
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
10
3
2
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
13
58
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
8
4
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
CTRL S
STATUS IN
MONITOR
CTRL S
IN
VIDEO 1
CTRL S
OUT
DVD/LD
CTRL S
OUT
J204: DB840
J2004: DB940
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
SP/B RY
RY CENTER
RY WOOFER
REAR SP RY
REAR SP RY
PRE RY
ABUS A1 IN
ABUS OUT
FL101
FLOURESCENT
INDICATOR TUBE
LA
T
CLK
CLR
DIN
FL CLK
FL LA
T
FL CLEAR
FL DA
TA
SPEAKER B
SPEAKER A
AD KEY6
AD KEY1
AD KEY2
AD KEY3
AD KEY4
AD KEY5
MD0
LED CE
LED CLK
LED DA
TA
SUR
EQ
D111 – 115
SETUP
NAME
LEVEL
MBUS DVD
SIRCS IN
MBUS VIDEO 1
MBUS ST
A OUT
MBUS TV
UP
DOWN
MOTOR
DRIVE
IC105
MD2
FLASH DA
TA
IN
FLASH DA
TA
OUT
U
D
ATA
UCLOCK
UMREQ
URESET
URESET
UMREQ
UCLOCK
UDATA
SOTO
SIN1
MD2
MD0
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
LAT
OUT
DATA
CLK
LAT
IN
OUT
IC409
(1/2)
IC409
(2/2)
IN
DATA
DATA
CLK
LAT
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 R
Y
RESET
LA
T
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
µ
COM ETC
DISP
µ
COM+5.6V
TUNER +5V
IR LINK +5V
3
1
3
1
3
1
5
7
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
M
M
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
D136 – 140, 141
D147 – 157
LED
DRIVE
SIRCS DET
IMPEDANCE
SELECTOR
3
1
–5V
REG
IC405
–5V
R-CH
2
3
+15V
REG
IC401
1
3
–15V
REG
IC402
2
3
+5V
REG
IC1208
1
3
+15V
REG
IC1207
1
3
+3.3V
REG
IC1203
1
3
+5V
REG
IC1204
1
3
+6.2V
REG
IC1205
1
3
3
6
8
5
+32V
REG
SWITCH
Q613
RESET
Q103
+6.2
REG
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
14
14
• 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
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
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
no mark : FM
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
J
: CD
I
: PHONO
• Abbreviation
AUS
: Australian model
CH
: Chinese model
CND : Canadian model
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
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:
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)
OSD board (DB940)
JOINT (1) (Q) board (DB840)/
JOINT (2) (Q) board (DB940)
JOINT (2) (Q) board (DB940)
MAIN board
VOL board
H.P board
• Abbreviation
AUS
: Australian model
CH
: Chinese model
CND : Canadian model
15
15
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.
16
16
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)
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