Sharp HT-DP3000 Service Manual page 12

HT-DP3000
MAIN PWB-A1(2/2)
A
R701
1K
FRONT_L
1
FL_GND
2
B
F_MUTE
3
R724
4.7K
R702
1K
FRONT-R
4
C
FR_GND
5
R741
1K
SW
6
D
SW_GND
7
R753
4.7K
SW_MUTE
8
R761
E 1K
CENTER
9
C_GND
10
R773
C_MUTE 4.7K
11
F
R781
1K
REAR
12
G
R_GND
13
R793
R_MUTE 4.7K
14
H
NOTES ON SCHEMATIC DIAGRAM can be found on page 24.
1
KTC3199 GR
0V
0V
C701
11
220P
0V 2.9V
IC701
1
10
0V
LM2876 C715
2
9
0.022
0V
–3.2V
POWER
3
8
0V –2.9V
R713
7 AMP. 4
0.2
2.9V
6 5
Q702
KRC107 M
Q701 R719
KRA107 M 18K
MUTE ON' ( )
R721
2
39K
3 2 3
0V –3.2V
2.9V
(3.4V)
1 (–0.4V)
1
(0V)
0V
2.9V
(0V)
(0.9V)
R720
KTC3199 GR
12K
0V
0V
C702
11
2.9V
220P
0V
IC702
10 1
0V
C716
LM2876
9 2
0.022
-3.2V 0V
8 POWER 3
0V
-2.9V R714
4
7
AMP.
0.2
2.9V
6 5
C714
10/50
Q754
KTC3199 GR
0V
0V
C741
11
220P
0V
2.9V
IC703
10 1
0V C748
LM2876 2
9
0.022
0V
-3.2V
8 3
POWER
0V -2.9V
R747
4
7
AMP.
0.2
6 5
2.9V
Q752
KRC107 M
Q751 R751
KRA107 M 33K
MUTE ON' ( )
R754
2 3 2 100K
3
2.9V
0V –3.2V
(0V)
(3.4V)
(–0.4V)
1 1
C745
2.9V
47/50
(0.9V)
R752
KTC3199 GR
27K
0V
0V
(0V)
0V
C761
11
2.9V
220P
0V
IC704
10 1
0V
C768
LM2876
9 2
0.022
-3.2V 0V
8 3
POWER
-2.9V
0V
R767
7 4
AMP.
0.2
6 5
2.9V
Q772
KRC107 M
Q771
R771
KRA107 M 39K
MUTE ON' ( )
R774
2 100K
3 2 3
2.9V
0V –3.2V
R772
(0V)
(3.4V)
(–0.4V)
27K
1 1
C765
2.9V
0V
22/50
(0.9V) Q784
(0V)
KTC3199 GR
0V
0V
C781
11
2.9V
220P
0V
IC705
10 1
0V C788
LM2876
2
9
0.022
-3.2V 0V
POWER
8 3
-2.9V
0V R787
4
7 AMP.
0.2
6 5
2.9V
Q782
KRC107 M
Q781 R791
KRA107 M 39K
MUTE ON' ( )
2 3 2
3
2.9V
0V –3.2V
R794
(0V)
(3.4V)
(–0.4V) 100K
1
C785 1
2.9V
0V
22/50
(0.9V)
(0V) R792
27K
2 3
Figure 12 SCHEMATIC DIAGRAM (3/7)
Q705
L701
0.3µH
5.0V
R727
D701
1N4148 22
D703
R725
R717
22
6.8K 1N4148
R729
R715
56K
2.2K 0V
0V
Q707
KTC3199 GR 5V
0V
Q708
KTC3199 GR
0V
C717
47/50
Q706
L702
D702
0.3µH
1N4148
5.0V
R728
22
R726
R718
6.8K 22
R716
2.2K
L703
0.3µH
5.0V
D704
R757
1N4148
22
R756
R749
6.8K 22
R748
2.2K
R758
56K
C749
47/50
Q774
L704
0.3µH
5.0V
R777
D706
1N4148 22
R769
R776
6.8K
22
R768
2.2K
R778
56K
C769
47/50
L705
D708 @
0.3µH
1N4148
5.0V
R797
22
R796
R789
22
6.8K
R788
2.2K
R798
56K
C789
47/50
4
– 12 –
C719
0.1
C721
0.1
R733
4.7
C720
0.1
C722
0.1
R734
4.7
C750
0.1
C751
0.1
R760
4.7
C770
0.1
C771
0.1
R780
4.7
C790
0.1
C791
0.1
R795
4.7
15 16 17 18 19 20
P11 12-B
5 6
–B
+B 1
C62
47/2
PO
R
–25V
1 2 3