30
30
STR-K990
STR-K990
4-16. SCHEMATIC DIAGRAM – DISPLAY BOARD, POWER KEY BOARD –
• See page 41 for IC Block Diagrams.
No mark:FM
50V
10
C115
1k
R105
220p
C110
0.1
C145
220p
C149
S106
MOVIE
S105
MUSIC
220p
C112
S112
MEMORY/ENTER
1
2
3
4
5
6
7
8
9
10
11
1.5k
R106
S102
AUTO CAL
7
6
5
4
3
2
1
S104
DISPLAY
330
R109
S109
S111
TUNING MODE
2.2k
R107
50V
C165
10
100
R115
S108
2CH
220
R101
S103
INPUT MODE
0.1
C160
470
R103
S101
MUTING
0.1
C162
RV102
82k
R118
220p
C147
220p
C164
220
R108
100
R116
470
R110
220p
C111
R120
10
1/4 W
680
R104
S107
A.F.D
0.1
C144
100
R119
100
R117
2
7
8
9
10
11
12
5
6
14
19
18
17
13
16
20
15
23
24
27
21
28
26
25
22
31
33
35
30
32
36
34
29
42
44
43
40
37
39
38
41
46
48
47
45
49
50
53
FL101
1
3
4
CN108
F1
F2
-20V
50V
C148 10
CL001
CL002
CL003
CL066
CL004
CL010
CL011
CL022
CL023
CL024
CL030
CL042
1
2
2P
CNP106
DCAC IN
DCAC IN
10
JW102
10
JW103
CL028
CL029
0.1
C114
5.0
JW107
5.0
JW108
5.0
JW106
12.5
JW105
1
2
3
4
5
5P
CN104
AD1
PW_SW
GND
TUNING-JOG-A
TUNING-JOG-B
RV101
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
CNS100
NC
GND
GND
+3.3V(STBY)
+5V
VOL_JOG(2A)
VOL_JOG(2B)
PW-SW
SIRCS
AD2
AD1
FL-LAT
FL-DIN
FL-CLK
INPUT JOG 4A
INPUT JOG 4B
DCAC IN
2.7
R197
2.7
R198
S110
NJL24H400A
IC103
330
R102
6G
5P
10P
17P
10G
1G
6P
7P
9P
1P
16P
5P
4P
6P
8G
12P
3G
2G
2P
6G
13P
7P
3P
14P
8G
9G
10G
9G
13P
5G
11P
8P
8P
14P
3P
15P
12P
9P
16P
10P
15P
17P
5G
1P
11G
4G
7G
11P
7G
2P
4P
11G
1G
2G
3G
4G
DISPLAY BOARD
IC103
REMOTE
CONTROL
RECEIVER
MASTER VOLUME
INPUT
SELECTOR
(FLUORESCENT INDICATOR TUBE)
3.3
+
-
TUNING
-17.1
-17.2
2.9
-13.5
-17.1
-17.1
-17.1
-17.1
-17.1
-17.1
-17.2
-17.1
5
0
5
5
-16.9
-16.9
-13.6
-12
-15.5
-12.2
-15.6
-10.7
5
-17.2
-17.2
-19.1
-18.7
-13.8
-15.5
-18.7
-15.4
-17
-17
3.3
5
5
5
3.3
5
5
5
5
0
0
3.3
5
S115
680
R111
1
2
AD1
PW_SW
SPEAKERS
(OFF/A/B/A+B)
POWER KEY BOARD
3
2
1
17P
4P
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
A
B
C
D
E
F
G
H
w w w . x i a o y u 1 6 3 . c o m
Q Q 3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299