Read Sony HT-DDW990 / STR-K990 Service Manual online
16
16
STR-K990
STR-K990
4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –
• R-CH is omitted due to same as L-CH.
• Signal Path
: FM
IN2
8
12
+V OUT2
POWER AMP
IC701
POWER AMP
IC601
9
NF2
LIMITER
Q701,702
11
-V OUT2
IN2
12
+V OUT2
9
NF2
11
-V OUT2
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
AF POWER
PROTECT
Q740
LIMITER
Q651,652
BOOSTER
Q653
BOOSTER
Q654
CURRENT
DETECT
Q655,656
IN2
8
12
+V OUT2
POWER AMP
IC501
9
NF2
LIMITER
Q501,502
11
-V OUT2
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
VACS
CONTROL
D841
D1001
PROTECT
SWITCH
Q722,723,725
Q793,795
RELAY
DRIVE
Q790
RY791
RELAY
DRIVE
Q710
RY701
D1111
RY601
D1110
D1109
D1108
RELAY
DRIVE
Q612
RY610
D1107
RELAY
DRIVE
Q610
L
R
R
L
R-CH
R-CH
R-CH
R-CH
SR-CH
SR-CH
R-CH
SR-CH
SR-CH
R-CH
PHONES
TB001
61
PROTECTOR
62
HP_RY
66
FRONT_A_RY/DG51_FB
67
FRONT_B_RY/DG51_FA
70
SW_RY
69
C/REAR/SB_RY
45
VAX CTRL
RV102
ENCODER
3
2
VOL_ENCODER(B)
64
VOL_ENCODER(A)
65
POWER_KEY
56
?/1
S100
77
RSTX
48
STOP
63
FUSE_DETECT
D910-913
AC
IN
T902
RY901
D915
F901
D914
RELAY
DRIVE
Q901
D920-923
23
VCC5
84
VCC3
-7V
REG
3
2
+7V
REG
1
3
AUDIO
+7V
IC801
+5V
REG
2
1
VIDEO
+5V
IC807
IC802
POWER_RY 58
D4001
F4001
F4002
RELAY
+B
-5V
REG
2
1
VIDEO
-5V
IC804
D805-808
F1
F2
L
SW
SL
SL
C
A
J790
FLUORESCENT
INDICATOR TUBE
FL101
9
FL_LAT
7 DIN
8 CLK
9 STB
16
FL_CLK
17
FL_DATA
14
29
31
31
SEG1-17
42
32
GRID1-11
F1
F2
FL DRIVE
IC100
ADCC
38
S109-112,115
FUNCTION
KEY
A/D1
39
FUNCTION
KEY
A/D2
40
S101-108
SYSTEM CONTROLLER
IC1101(2/2)
AF POWER
PROTECT
Q640
AF POWER
PROTECT
Q540
FRONT A
SURROUND
55
HP_DETECT
BUFFER
IC101
82
83
X0
X1
X1101
24MHz
35
AVCC
36
AVRH
+3.3V
REG
3
1
IC1904
AUDIO
-7V
+10V
REG
3
1
TUNER
+10V
IC1902
T901
Q921
AC DET
1
2
IC1111
D802
R803
+B
-B
-B
SWITCH
Q691,692
-20V REG
Q801
FL101
-20V
POWER AMP
-B
+5V
REG
3
1
IC1031
PROTECT
DET
2
7
IC691
+5V
+2.5V
REG
5
+2.5V
+3.3V
REG
2
4
IC1903
+5.8V
REG
4
1
2
IC5006
HDMI
+5.8V
+5.8V
+3.3V
+5V
REG
3
1
IC1001
AUDIO
+5V
+7V
REG
2
1
IC4001
+5V
REG
4
2
IC1906
DMPORT
+5V
+3.3V
REG
3
1
IC5003
HDMI
+3.3V
+3.3V
89
HDMI_CTRL
72
BRIDGABLE_RY
SPEAKERS
(IMPEDANCE USE 6-16
Ω)
MASTER
VOLUME
VOLUME
RV101
ENCODER
3
2
ENC_B
32
ENC_A
31
INPUT
SELECTOR
8
RESET
5
1
IC2000
AMP
+3.3V
(STBY)
MAIN
SECTION
CENTER
(Page 15)
RELAY
DRIVE
Q611
RY710
RELAY
DRIVE
Q560
RY560
L
R
R-CH
TM602
FRONT B
TM604
J2000
AUTO CAL MIC
54 SIRCS
REMOTE
CONTROL
RECEIVER
2
IC103
AUDIO OUT
J309
SUB WOOFER
RELAY
DRIVE
Q809
RY801
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