Roland EM-20 Service Notes page 19

DATA
S S
S S
D D
0 1
SSC7
1
D1
SW1
2
M
TRANSPOSE
SSC6
U
1
D9
X
SW9 SW10
2
KBD_VEL MODE_ARR_MDRUM
SSC5
1
D17
SW17 SW18
2
STY_PROG+ STY_PROG-
SSC4
1
D25
SW25
2
SYNC_START
SSC3
SSC2
1
D41
D
SW41 SW42
2
A
TONE1 TONE2
SSC1
T
A
SSC0
1
D57
SW57
2
DEMO
CN1
AMPC1.2720P
SSD0 1 20 SC0
SSD1 2 19 SC1
SSD2 3 18 SC2
SSD3 4 17 SC3
SSD4 5 16 SC4
SSD5 6 15
SSD6 7 14
SSD7 8 13
9 12
10 11
To CPU Board Cn4
5VD
1 2 3 6 4 5
5VD
A B C G G G
16
1 2 2
VCC
C4
A B
33uF16
CA1 CA2 8
GND
Y Y Y Y Y Y Y Y
8x100pF 8x100pF
0 1 2 3 4 5 6 7
1 1
1 1 1 1 1 1 IC8
5 4 3 2 1 0 9 7
74HC238
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
B B B B B B B B M M M M M M M M B B B B B B B B
R R R R R R R R K K K K K K K K R R R R R R R R
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
CN4
AMPC1.2716P AMPC1.2716P
MK0 1 16 SSD0 MK4 1
BR0 2 15 SSD1 BR4 2
MK1 3 14 SSD2 MK5 3
BR1 4 13 SSD3 BR5 4
MK2 5 12 SSD4 MK6 5
BR2 6 11 SSD5 BR6 6
MK3 7 10 SSD6 MK7 7
BR3 8 9 SSD7 BR7 8
to Left Keyb Pcb to Right Keyb Pcb
ALL DIODES D1..D64 IN THIS SHEET ARE 1N4148
S S S
S S S
D D D
2 3 4
1 1
D4 D5
SW4 SW5
2 2
GROUP_A/B STYLE_SONG
1 1 1
D10 D11 D13
SW11 SW13
2 2 2
MODE_ORGAN INTEL/LAYER
1
D18
2
1
D27
SW27
2
USER_WRITE
1
D37
SW37
2
VOLUME_UP
1 1 1 1
D42 D43 D44 D45
SW43 SW44 SW45
2 2 2 2
TONE3 TONE4 TONE5
1
D53
SW53
2
ARRANGER+
1 1 1
D59 D60 D61
SW59 SW60 SW61
2 2 2
CHORUS_REV INTRO ORIGINAL
IC6
74HC238
SC0 1
A
SC1 2
B
SC2 3
C
SC4 6
G1
4
G2A
5
G2B
5VD
V
C
C
1
5VD
6
1 2 3 6 4 5
A B C G G G
16
1 2 2
VCC
A B
C8
C1
C7 100nF
100nF
100nF 8
GND
Y Y Y Y Y Y Y Y
0 1 2 3 4 5 6 7
1 1 1 1 1 1 IC9
5 4 3 2 1 0 9 7
74HC238
SC4 SC3
0 0 MK0-MK7
M M M M M M M M
K K K K K K K K
0 1 BR0-BR7
0 1 2 3 4 5 6 7
1 SWITCHES
X
1 SWITCHES
X
CN3
16 SSD0
15 SSD1
14 SSD2
13 SSD3
12 SSD4
11 SSD5
10 SSD6
9 SSD7
S S S
S S S
D D D
5 6 7
1
D6
SW6
2
REC
1 1
D15 D16
SW15 SW16
2 2
TEMPO+ TEMPO-
1 1
D23 D24
SW23 SW24
2 2
STY_MORPH+ STY_MORPH-
1 1 1
D30 D31 D32
SW30 SW31 SW32
2 2 2
START/STOP TONE_VAR METRONOME
1 1 1
D38 D39 D40
SW38 SW39 SW40
2 2 2
VOLUME_DWN STYLE ONE TOUCH
1 1 1
D46 D47 D48
SW46 SW47 SW48
2 2 2
TONE6 TONE7 TONE8
1 1 1
D54 D55 D56
SW54 SW55 SW56
2 2 2
ARRANGER- UPPER+ UPPER-
1 1 1
D62 D63 D64
SW62 SW63 SW64
2 2 2
FILL VARIATION ENDING
MUX
15 SSC0
Y0
14 SSC1
Y1
13 SSC2
Y2
12 SSC3
Y3
11 SSC4
Y4
10 SSC5
Y5
9 SSC6
Y6
7 SSC7
Y7
TO LCD
Bulb Lamp
G
N
D CN2
5045-02A
NIU
8 5VD
1 2
C6
100uF16