15
15
STR-K785
STR-K785
4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –
• R-CH is omitted due to same as L-CH.
• Signal Path
: FM
POWER AMP
IC501
POWER AMP
IC601
LIMITER
Q501,502
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
AF POWER
PROTECT
Q507
LIMITER
Q601,602
BOOSTER
Q603
BOOSTER
Q604
CURRENT
DETECT
Q605,606
POWER AMP
IC701
LIMITER
Q701,702
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
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)
TM602
TM600(2/2)
61
62
66
68
67
46
RV102
ENCODER
3
1
?/1
S152
IC102
D910-913
AC
IN
T902
RY901
D915
D914
RELAY
DRIVE
Q901
D920-923
AUDIO
+7V
IC821
IC822
RELAY
+B
D804-807
X1101
24MHz
F1
F2
L
SL
SL
C
SW
J700
FLUORESCENT
INDICATOR TUBE
FL101
14 29
42 31
F1
F2
FL DRIVE
IC100
FUNCTION
KEY
S100-108
S131-139
FUNCTION
KEY
S110-116
FUNCTION
KEY
AF POWER
PROTECT
Q607
AF POWER
PROTECT
Q707
IC850(1/2)
2
1
FRONT
SURROUND
IC850(2/2)
5
7
55
IC1904
AUDIO
–7V
TUNER
+10V
IC1902
IC1071
T901
Q911
AC DET
IC1111
D811
R803
+B
–B
–B
SWITCH
Q851,852
–20V REG
Q801
FL101
–20V
+B
SWITCH
Q860-862
POWER AMP
+B
POWER AMP
–B
IC1031
+5V
+2.5V
IC1901
+3.3V
IC1001
AUDIO
+5V
TUNER
3.3V
SPEAKERS
IMPEDANCE USE 6-16
Ω
MASTER
VOLUME
+3.3V(STBY)
CENTER
RELAY
DRIVE
Q560
RY702
AUDIO OUT
J403
SUB WOOFER
AEP
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
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