Circuit Diagram (Amplifier Pcb Assy) - Roland Va-7 Service Notes

From AUDIO BOARD
Cn8
MUTE
1
2 MUTE
3 AGND
4 LOUT
5 AGND
6 ROUT
0=MUTE ON
CN2 1=MUTE OFF
5045-06A
C75 C60
10uF16BP 10uF16BP
VCC -VCC
+12V 1
1
-12V 2 R74 NIU
2
LSEND 3
3
AGND 4
4 R73 NIU
RSEND 5
5
LRET 6
6
RRET 7 22uF25
7
CN6
B7B-XH-A
TO EQ BOARD
C13
R12
27K
220nF
5%
3
Rig th
2
VR11
22K
1
C35
0.1C
C39
C36
0.1C
0.1C
C38
C37
0.1C 22uF25
0.1C
C41
R76
27K
220nF
5%
3
Left
VR12
2
22K
1
R6
D2 10K
1N4148 R10
220
R8
2 1
22K 3
R5
2
4K7
R9
1 Q2
22K BC549B
R7
C8
10K
10uF16
VS
C11
0.1C
C10
C12
220uF25
1
IC6
1 6 9
TDA7350
S P V
5 8
B G S
IN2+ OUT2
N
D
S I
1 10
S G N O
IN1+ OUT1
V N 1 B
R D - R
7 3 2 4
C14
C9
220nF
220uF25
5%
RL1
DS2YSDC12V
Coil=720Ohm
VS
1N4002
C44
C42 C43
0.1C
220uF25
1 IC7
1 6 9
TDA7350
S P V
5 8
B G S
IN2+ OUT2
N
D
S I
1 10
S G N O
IN1+ OUT1
V N 1 B
R D - R
7 3 2 4
C45
220nF C46
5% 220uF25
VR VS
From SWITCHING
POWER SUPPLY VR
1 (Cn2)
2 Q1
BC560B 1 +17V
3 2
3
4 GND
C3
R41
CN3 4700uF25
270
5045-04A
1/4W
R40
1K
1/4W
CN1
1 4 6 8
5045-04A
+ C N N
2 1 SPR+
M C O
2 2 2
2 SPR-
3 SPL+
D1
4 SPL-
C N N
1 M C O
- 1 1 1
1 1 1
6 3 1 9
R39
1K
1/4W
From SWITCHING
R75
POWER SUPPLY (Cn2)
R72 1 -12V
2 AGND
0
3 +5V
4 +5V
5 DGND
6 DGND
7 +12V
C47
4700uF25
CN4
5045-07A
1 -12V
2 AGND
R70 R71 3 +5V
0 0 4 +5V
5 DGND
6 DGND
7 +12V
CN5
5045-07A
To AUDIO BOARD (Cn10)
SPEAKERS
+
RIGTH WOOFER
4 OHM
-
4.7uF
RIGHT TWEETER
4 OHM
+
LEFT WOOFER
4 OHM
-
4.7uF
LEFT TWEETER
4 OHM
-VCC VCC
0
C2
100uF25
C1
100uF25