
17
17
STR-K980
STR-K980
3-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –
• R-CH is omitted due to same as L-CH.
POWER AMP
IC701
POWER AMP
IC601
LIMITER
Q701,702
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
AF POWER
PROTECT
Q740
LIMITER
Q651,652
BOOSTER
Q653
BOOSTER
Q654
CURRENT
DETECT
Q655,656
POWER AMP
IC501
LIMITER
Q501,502
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
LED DRIVE
Q110
D105
D721
PROTECT
SWITCH
Q722,723,725
RELAY
DRIVE
Q790
RY791
RELAY
DRIVE
Q710
RY701
D1110
RELAY
DRIVE
Q610
RY601
D1108
RELAY
DRIVE
Q550
RY501
D1107
D1111
L
R
SR
SL
C
R-CH
R-CH
R-CH
PHONES
TM601
RV102
ENCODER
3
1
64
65
56
?/1
S100
IC102
D910-913
AC
IN
T902
RY901
D915
F901
D914
RELAY
DRIVE
Q901
D920-923
AUDIO
+7V
IC801
IC802
58
RELAY
+B
D805-808
82
83
X1101
24MHz
F1
F2
L
SL
SL
C
J791
FLUORESCENT
INDICATOR TUBE
FL101
7
8
9
F1
F2
FL DRIVE
IC100
38
S108-111,115,124
FUNCTION
KEY
39
FUNCTION
KEY
40
S101-107
• Signal Path
: FM
AF POWER
PROTECT
Q640
AF POWER
PROTECT
Q540
IC691
2
1
FRONT
SURROUND
IC691
5
7
IC1904
AUDIO
-7V
TUNER
+10V
IC1902
T901
Q921
AC DET
IC1111
D802
R803
+B
-B
-B
SWITCH
Q691,692
-20V REG
Q801
FL101
-20V
POWER AMP
-B
IC1031
+5V
+2.5V
IC1901
+3.3V
IC1001
AUDIO
+5V
SPEAKERS
IMPEDANCE USE 6-16
Ω
MASTER
VOLUME
RV101
ENCODER
3
1
32
31
INPUT
SELECTOR
IC2000
+3.3V
(STBY)
TM502
CENTER
AUTO CAL MIC
J2000
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
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299