Circuit Diagram (Phones Board) - Roland BOSS BR-1600CD Service Notes

Jan.2004

CIRCUIT DIAGRAM (PHONES BOARD)

fig.sphoa
+9V
to MAIN
BOARD
CN14
CN8
A-GND 1
1
HEADPHONE1_L
2
2
A-GND
3
3
HEADPHONE1_R 4
4
A-GND
5
5
OUTPUT MUTE
6
6
A-GND 7
7
A-GND
8
8
+9V
9
9
+9V 10
10
-9V
11
11
-9V
12
12
A-GND 13
13
HEADPHONE2_R
14
14
A-GND
15
15
HEADPHONE2_L 16
16
16FE-ST-VK-N
A
C127 C128
0.1 100/16
A A
-9V
46
C72 C73
0.1 100/16
A A
R100 2.2k
A
VR28A VR28B
EVJC25 50kA L15 EVJC25 50kA L15
C77
12 22
10/16
A
VR28C
EVJC25 50kA L15 R107 2.2k
A
A
C84
10/16
R112
100k
A
R116 4.7k
A
VR29A VR29B
EVJC25 50kA L15 EVJC25 50kA L15
C90
12 22
10/16
A
VR29C
EVJC25 50kA L15 R123 4.7k
A
A
C97
10/16
R128
100k
A
C100
10/16
-
A
+
C130
10/16
IC6C
NJM4556AD
R137 15k
C75 47p
C76 R138 R429
100/16 33 33
2
-
1
3
+
Q30
C78 R104 3 2SC2878A
R105 IC6A 150p 100k
100k NJM4556AD
R106
A A
330 R425
R108 15k 1k
A
C82 47p
C83 R109 R430
6 100/16 33 33
-
7
5
+
Q31
C85 R111 3 2SC2878A
IC6B 150p 100k
NJM4556AD
R113
A A
330
R426
1k
A
R117 15k
C88 47p
C89 R118 R431
2 100/16 33 33
-
1
3
+
Q32
IC7A C91 R120 3 2SC2878A
R121 NJM4556AD 150p 100k
100k
R122
A A
330
R124 15k R427
1k
A
C95 47p
C96 R125 R432
100/16 33 33
6
-
7
5
+
Q33
IC7B C98 R127 3 2SC2878A
NJM4556AD 150p 100k
R129
A A
330
R428
+9V 1k
A
C129 C102
0.1 0.1
-
A A
+
C101 C131
IC7C
0.1 NJM4556AD 0.1
-9V H:ON/L:OFF
R103 L17
33 NIU(BL02RN2-R62)
JK9
2
4
3
1
1 Q2 L18
DTC343TS NIU(BL02RN2-R62)
LGR4609-7100
C79
NIU(10p) L19
A
NIU(BL02RN2-R62)
C80
NIU(10p)
A
R110 R
33
A
HEAD
PHONE_2
Q3
1
DTC343TS
A
R119 L20 JK10
33 NIU(BL02RN2-R62) LGR4609-7100
2
4
3
1
Q4 L21
1
DTC343TS NIU(BL02RN2-R62)
C92 L22
NIU(10p) NIU(BL02RN2-R62)
A
C93
NIU(10p)
A
R126 R
33
A
HEAD
PHONE_1
1 Q5
DTC343TS
A
L23
NIU(BL02RN2-R62)
BR-1600CD
47