Roland EM-20 - Main PCB Circuit Diagram (EM-20)

A
B
C
D
E
F
G
H
I
L
M
N
O
P
Q
R
S
T
U
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K
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EM-20/EM-10
July, 1999
CIRCUIT DIAGRAM (MAIN PCB ASSY EM-20)
11
LEFT
T
O
M
A
I
N
S
E
C
T
.
POWER SECTION
P
H
O
N
E
S
1
2
V
S
2
OUT
1
MUTE
5
IN+
8
IN-
6
SVR
7
THR
4
G
1
6
G
1
5
G
1
4
G
1
3
G
1
2
G
1
1
G
1
0
G
9
B
S
3
IC2
TDA1905
C8
10uF25
C9
47uF16
C11
2200uF16
C33
100nFC
R17
10K
C14
100nF
R16
100
1/4W
VI
1
G
N
D
3
VO
2
IC3
L4940V5
TO-220 with heat-sink
C24
10uF16
C34
100nFC
8
7
3
2
4
5
1
JK1
YKB21_5006
L3
L1
L2
C30
1uF50
8
7
3
2
4
5
1
JK8
YKB21_5006
L13
L14
L15
AGND
DGND
DGND
9V
5VA
5VA
VPD
5VA
R8
100I
R7
100I
R83
100I
R84
100I
L1=L2=L3=L13=L14=L15=BLO3RN2-R62T2
1
2
D1
1N4002
RIGHT
+
-
12V/1A
FROM MAIN SECT.
AGND
LOUT
FROM MAIN SECT.
R6
10K
V
S
2
OUT
1
MUTE
5
IN+
8
IN-
6
SVR
7
THR
4
G
1
6
G
1
5
G
1
4
G
1
3
G
1
2
G
1
1
G
1
0
G
9
B
S
3
IC1
TDA1905
C2
2200uF25
C3
100uF25
C5
47uF16
C7
2200uF16
C19
100nF
C20
100nF
R27
2.2
3W
1
2
4
3
L4
PLT1-R53C
EMI_FILTER
C29
1uF50
C4
10uF25
C13
100nF
R5
100
1/4W
1 2
SW1
SPUN 19F
C1
3300uF25
12
D3
BY251
2
1
CN8
CONN_2X1
2
1
CN9
CONN_2X1
R22
100I
R87
0 NIU
R82
0
R81
0
R80
0
R79
0
NIU
R78
0
NIU
1
2
3
JK2
HEC-2305-01-230
R
AGND
ROUT
R1
10K
R3
2K2
R4
820
R14
47K
C12
47uF16
C15
220nF
C18
33nF
5%
1
2
D2
BZX79C6V2
R24
nc
C21
nc
5%
R26
470
R2
1
1/4W
C28
1uF50
R70
2K7
C25
4.7uF25
C27
1uF50
C6
22uF16
R13
100
R12
10K
R11
10K
R10
4K7
R15
150K
2
1
3
Q2
BC549B
R9
1K 2
1
3
Q1
BC549B
VPD
5VA
R69
2K2
T
O
S
P
E
A
K
E
R
S
GND
LSR
GND
LSL
High Freq. Boost
Low Freq. Boost
LEFT RIGTH
R19 C17 R23 C22
R4 C18 R24 C21
L
R18
10K
R19
820
C16
220nF
C17
33nF
5%
R23
nc
C22
nc
5%
R25
470
3
4
2
1
CN3
5045-04A
R20
1
1/4W
C31
1uF50
R72
2K7
C26
4.7uF25
C32
1uF50
C10
22uF16
R21
2K2
R71
2K2
t
o
p
o
w
e
r
s
e
c
t
.
AGND
ROUT
AGND
LOUT
1
2
D4
BZX79C4V7
2
1
3
Q10
BC560B
R45
1K
R47 1K
R48
1K
R51
47K
C55
1uF50
2
1
CN4
CONN_2X1
2
1
CN5
CONN_2X1
9VA
3
1
2
Q6
2SC2878
3
1
2
Q5
2SC2878
-4V
XRES
f
r
o
m
p
o
w
e
r
s
u
p
p
l
y
C36
1000uF16
C37
100uF16
C38
47uF16
C44
10uF16BP
L5
EXCELDR25V
C51
330pF
C56
47uF16
2
3
1
84
IC4A
M5218P
2
3
1
84
IC5A
M5218P
C60 82pF
2
13
Q7
BD371
2
1
3
Q8
BC549B
2
1
3
Q9
BC549B
R32
15K
R38
12K
R40 1K
R46
1K
R49
220K
R50
47K
R52
47K
R53 27K
R55
100K
R58
4K7
R59
220K
R60
nc
AGND
DGND
DGND
9V
5VA
5VA
5VA 5VD 9VA
8V 9VA
L8
EXCELDR25V
NIU
C46
1000uF16
NIU
R34
2K2
-4V
RESET
XRES
GND
XRES
XRES
XRES
C42
10uF16BP
R56
4K7
C62
4.7uF16
C63
47uF16
12
D6
1N4148
1
2
D7
1N4148
NC
2
GND
3
RES
5
CAP
4
VCC
1
IC7
M51953A
R68 1K
C71
100nF
TP8
TP9
5VD
SW2
NIU
M
I
D
I
MAIN SECTION
IN
RXD
TXD2
1
3
Q11
BC560B
R66
10K
R67
10K
1
2
4
3
L11
SBT0160W 1
2
D8
1N4148
R73
220
R74
1K
14
2
53
JK6
MGPR5L
C72
100nFC
C73
100nFC
NC
1
LA
2
LC
3
NC
4
GND
5
OUT
6
EN
7
VCC
8
IC8
6N137
5VD
5VD
OUT
SUSTAIN
from Cpu Board Cn3
MODSEL
DAMP
1
2
4
3
L9
SBT0160W
L10
SBT0460
R64
220
R65
220
1
2
4
3
L12
SBT0160W
R75
1K
R76
22K
2
1
3
Q12
BC549B
R77
22K
1
2
D9
1N4148
1
2
D10
1N4148
14
2
53
JK5
MGPR5L
3
1
2
JK7
HLJ052001110
C74
100nF
5%
C69
4.7nFC
CERAMIC DISK 20%
R85
10K
3
4
5
6
7
2
1
8
9
10
11
12
13
14
CN10
AMPC1.2714P
XRES
TXD1
RXD1
DAMP
MODSEL5VD
5VD
MODSEL = 0V
R86
10K
NIU
JIG TEST
SD
SCK
DACC
L
R
C35
10uF16
C43
10uF16BP
2
13
FL1
ELKTR391CA
C53
100uF16
C54
100uF16
R57
4K7
R61 1K
R62 1K
R63 1K
D
V
D
D
4
A
V
D
D
7
A
V
D
D
8
LRCK
13
CLK
16
SI/LSI
15
NC
3
4/8FS
1
LR/RSI
14
L.OUT
11
R.OUT
6
R.REF
9
L.REF
10
D
G
N
D
2
A
G
N
D
5
A
G
N
D
1
2
IC6
UPD6376GS
FLAT
C68
100nFC
DACC
SCK
SD
5VD 5VA
5VD
L16
EXCELDR25V
R88
0
NIU
C67
100uF16
C57
100nF
C70
100nF
LL
L
RR
R
C39
10uF16BP
C40
10uF16BP
C41
10uF16
C45
10uF16BP
TP1
TP2
TP3
TP4
TP5
TP6
C49
10nF
C50
10nF
C52
330pF
6
5
7
IC4B
M5218P
6
5
7
IC5B
M5218P
C61 82pF
1
2
D5
1N4148
R28 1K
R30 1K
R33
15K
R39
12K
R41
100K
R42
100K
R43
10K
R44
10K
R54
27K
FIX2
100nFC
C58
100NFC
C59
100NFC
C64 100NFC
C65
100NFC
8V
8V 8V
8V
R35
2K2
R
L/M
O
U
T
P
U
T
3
1
2
JK3
HLJ052001110
L6
EXCELDR25V
L7
EXCELDR25V
3
1
2
JK4
HLJ052001110R29
1K
R31
1K
R36 680
R37
680
2
13
FL3
ELKTR391CA
2
13
FL4
ELKTR391CA
3
1
2
Q3
2SC2878
3
1
2
Q4
2SC2878
*
*
*
*