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15
15
STR-K680/K780
STR-K680/K780
3-2. 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
IC501
POWER AMP
IC601
9
NF2
LIMITER
Q501,502
11
-V OUT2
IN2
12
+V OUT2
9
NF2
11
-V OUT2
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
AF POWER
PROTECT
Q507
LIMITER
Q601,602
BOOSTER
Q603
BOOSTER
Q604
CURRENT
DETECT
Q605,606
IN2
8
12
+V OUT2
POWER AMP
IC701
9
NF2
LIMITER
Q701,702
11
-V OUT2
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
2
+V OUT1
5
NF1
LIMITER
Q571,572
3
-V OUT1
BOOSTER
Q754
BOOSTER
Q753
CURRENT
DETECT
Q755,756
D883
D529
D729
PROTECT
SWITCH
Q881-883
RELAY
DRIVE
Q509
RY502
RELAY
DRIVE
Q508
RY501
RELAY
DRIVE
Q608
RY601
RELAY
DRIVE
Q708
RY701
L
R
R
L
R-CH
R-CH
R-CH
PHONES
TM600(1/2)
TM601(1/2)
TM601(2/2)
TM600(2/2)
61
PROTECTOR
62
HP RY
66
FRONT RY
68
REAR RY
67
C/SW RY
46
VACS
RV102
ENCODER
3
1
VOL_ENC(B)
65
VOL_ENC(A)
64
POWER KEY
56
?/1
S152
77
RSTX
48
STOP
54
SIRCS
63
FUSE DETECT
REMOTE
CONTROL
RECEIVER
1
IC102
D910-913
AC
IN
T902
RY901
D915
D914
RELAY
DRIVE
Q901
D920-923
23
VCC5
84
VCC3
–7V
REG
3
2
+7V
REG
1
3
AUDIO
+7V
IC821
IC822
POWER RY
58
RELAY
+B
D804-807
82
83
X0
X1
X1101
24MHz
F1
F2
L
SL
SL
C
A
IN1
6
SBL
SW
J700
FLUORESCENT
INDICATOR TUBE
FL101
59
FL_DATA
60
FL_CLK
47
FL_LAT
7
DIN
8
CLK
9
STB
14 29
SEG1-16
42 31
GRID1-12
F1
F2
FL DRIVE
IC100
FUNCTION
KEY
A/D0
38
S100-108
S131-139
FUNCTION
KEY
A/D1
39
S110-116
FUNCTION
KEY
A/D2
40
SYSTEM CONTROLLER
IC1101(3/3)
AF POWER
PROTECT
Q607
AF POWER
PROTECT
Q707
IC850(1/2)
2
1
FRONT
SURROUND
R
L
R-CH
TM602
SURROUND
IC850(2/2)
5
7
55
HP DETECT
BUFFER
IC101
35
AVCC
+3.3V
REG
3
1
IC1904
AUDIO
–7V
+10V
REG
3
1
TUNER
+10V
IC1902
+3.3V
REG
3
1
TUNER
+3.3V
IC1071
T901
Q911
AC DET
1
2
IC1111
D811
R803
+B
–B
–B
SWITCH
Q851,852
–20V REG
Q801
FL101
–20V
+B
SWITCH
SWITCH
Q860-862
POWER AMP
+B
POWER AMP
–B
+5V
REG
3
1
IC1031
+5V
+2.5V
REG
5
+2.5V
+3.3V
REG
2
4
IC1901
+3.3V
+5V
REG
3
1
IC1001
AUDIO
+5V
SPEAKERS
IMPEDANCE USE 6-16Ω
MASTER
VOLUME
VOLUME
8
RESET
+3.3V(STBY)
MAIN
SECTION
(Page 14)
CENTER
SUB
WOOFER
RELAY
DRIVE
DRIVE
Q560
RY702
AUDIO OUT
J403
SUB WOOFER
K780
AEP,UK,RU
K680
K680
K780
VOLTAGE
SELECT
S901
E51
Ver. 1.1
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