Sharp HT-DP2500W Service Manual page 18

HT-DP2500W
FM SIGNAL
A
MAIN PWB-A1(2/2)
R701 C701
1K 220P
FRONT_L
1
FL_GND
2
B
F_MUTE
3
R724
4.7K
R702
C702
1K
FRONT-R 220P
4
C
FR_GND
5
R741
C741
1K
220P
SW
6
D
SW_GND
7
R753
4.7K
SW_MUTE
8
C745
47/50
E
R761 C761
1K 220P
CENTER
9
C_GND
10
R773
C_MUTE 4.7K
11
F
0V
(3.4V)
C765
22/50
R781 C781
1K 220P
REAR
12
G
R_GND
13
R793
4.7K
R_MUTE
14
0V
(3.4V)
C785
22/50
H
NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
1
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Q705
IC701-IC705
KTC3199 GR
POWER AMP.
5.0V
0V
0V
R717
11
6.8K
0V 2.9V
C715
10 1
0.022
0V
R715
IC701
9 2
2.2K
0V
–3.2V
8 LM2876 3
0V –2.9V R713
7 4
0.2
2.9V
6 5
Q702 Q701 R719
KRC107 M KRA107 M 18K
R721
3
2
39K
3 2
0V
–3.2V
2.9V OVER CURRENT
(3.4V)
(–0.4V)
1
1
(0V)
DETECTOR
0V
(0V) 2.9V(0.9V)
Q706
R720
KTC3199 GR
12K
C709
MUTE ON:( )
100/35
0V 5.0V
0V
R718
11
2.9V
6.8K
0V
10 1
0V
C716
R716
IC702
2
9
0.022
2.2K
-3.2V 0V
LM2876 3
8
0V
-2.9V R714
4
7
0.2
2.9V
6 5
C714
10/50
Q754
KTC3199 GR
OVER CURRENT
DETECTOR
0V 5.0V
0V
R749
11
6.8K
0V 2.9V
10 1
0V C748
IC703 R748
9 2
0.022
2.2K
0V
-3.2V
LM2876
8 3
0V -2.9V
R747
4
7
0.2
6 5
2.9V
R751
39K
Q752 Q751
KRC107 M KRA107 M
R754
2 100K
3 2 3
2.9V
–3.2V
0V
OVER CURRENT
(0V)
(3.4V) (–0.4V)
1 1
DETECTOR
2.9V
0V
(0.9V)
(0V)
R752 Q774
KTC3199 GR
27K
MUTE ON:( )
0V
5.0V
0V
R769
11
2.9V 6.8K
0V
1
10
0V C768
R768
IC704
9 2
0.022
2.2K
0V
-3.2V
8 LM2876 3
0V
R767
7 4
0.2
-2.9V
6 5
2.9V
R771
39K
Q772
Q771
KRC107 M
KRA107 M
R774
3 2 3 2 100K
2.9V –3.2V
R772
OVER CURRENT
(0V)
(–0.4V)
1 27K
1
2.9V
DETECTOR
0V
(0.9V)
(0V)
Q784
KTC3199 GR
MUTE ON: ( )
5.0V
0V
0V
R789
11
2.9V
6.8K
0V
10 1
IC705
C788
0V
R788
9 2
0.022
2.2K
LM2876
0V
-3.2V
3
8
-2.9V
0V
R787
7 4
0.2
6 5
2.9V
MUTE ON: ( ) R791
39K
Q782 Q781
KRC107 M KRA107 M
R794
2 3 100K
3 2
2.9V
–3.2V
R792
(0V)
(–0.4V)
1
27K
1
2.9V
0V
(0.9V)
(0V)
2 3
Figure 14 SCHEMATIC DIAGRAM (3/7)
OVER CURRENT
L701
DETECTOR
0.3mH
R727
D701
1N4148 22
D703 R725
C719
22
1N4148 0.1
C721
R729
0.1
56K
0V
R733
0V
Q707
4.7
KTC3199 GR 5V
0V
Q708
KTC3199 GR
0V
C717
47/50
D702
L702
1N4148
0.3mH
R728
22
R726
22
C720
0.1
C722
0.1
R734
4.7
L703
0.3mH
D704
R757
1N4148
22
R756
D705
22
1N4148
C750
5.0V
0.1
R758
0V
56K
C751
0V
Q755
0.1
5.0V
KTC3199 GR
0V
R760
4.7
Q756 0V
KTC3199 GR
C749
47/50
D706 L704
1N4148 0.3mH
R777
22
R776
22
C770
5.0V
0.1
R778
0V
56K
0V
C771
Q775
0.1
5.0V
KTC3199 GR
0V
R780
Q776
4.7
KTC3199 GR
0V
L705
D708
0.3mH
1N4148
R797
22
D709 R796
1N4148 22
C790
5.0V
0.1
R798
0V
56K
0V
C791
Q785
0.1
5.0V
KTC3199 GR
0V
R795
4.7
Q786 0V
KTC3199 GR
C789
47/50
4
– 14 –
–B
2SD201
+B 10.9V
11.6V
C624
47/25
POWER SU
R617
220
–25V
R616
220
Q603
KTC31
15 16 17 18 19 20 1 2 3 4 5 6
21
CNP4
P13 12-B
5 6
Q622
D62
1N41
Z
MTZ
SWITC
0.77