Circuit Diagram (Panel) - Roland RC-20 Service Notes

RC-20

CIRCUIT DIAGRAM (PANEL)

IC1C
-
M5218AF
+
*1: 0.47/16S = Submicron Chip Capacitor
PANEL BOARD ASSY
75D433P000 1/2
75D433P001 1/2
16
OVER CENTER AUTO MEMORY
PLAY
DUB CANCEL START FULL
L-34YDSL L-34GDSL L-34HDSL L-312LRD L-34HDSL
LED1 LED2 LED3 LED4 LED5
1 2 1 2 1 2 1 2 1
L-34GDSL L-34HDSL L-312LRD L-34HDSL
(red )
LED10 LED11 LED12 LED13
1 2 1 2 1 2 1 2 1
3
(green)
LED9
GL3ED8
TAP PHRASE LOOP REVERSE FLAT_AMP
TEMPO USED QUANTIZE SIM
RD901-40-125F-B54-00D (50KB)
RD901-40-125F-B54-11D (50KB 11clicks)
+
D 3. 3
VR1 VR2
R4
330 PHRASE
GUIDE
SELECT
C3 2 2
POWER LED17 0.1
L-113GDT
02DZ5.1-Y N.I.U.
D
D9 D10
RD901-40-125F-AF5-00D (250KA)
VR4
INST
A A D
1
R5 1M
C7 R8
AVcc AVcc
10/16 27k
2
-
3
+
R9
47k IC1A
M5218AF
C8
10/16
C9 R10
10/16 47k
A A
*1LOT-16LOT
*17LOT-
INST
REC EXIT
MIC
L-34HDSL L-312LRD L-34HDSL
LED6 LED15 LED8 WRITE
2 1 2 1 2 1 2
L-312LRD L-34HDSL
EXIT
LED14 LED7
2 1 2 1 2
CN1
1
1
2
2
3
3
MODE
4
4
5
5
6
6
7
7
8
8
9
9
AUTO
10
10
START
WRITE NORMAL WIRING 10P
AVcc R1 PEAK
1.2k
2SC4116GR
1 2
Q1 R2
LED16 10k
L-34HDSL 1
RD901-40-125F-B54-00D (50KB)
VR3 R3
Q2 1 100k
2SC4116GR
LEVEL C2
1/50
2
C10
A
0.47/16S
*1
RD901-40-125F-AF5-00D (250KA)
VR5
MIC
3 1 3
C6 R6 R7
C4 10/16 1k 1M C5
10/16 10/16
1 6
-
7
5
+
IC1B
M5218AF
SW1
SKQKAB
D1 1SS352
SW2
1 2 TAP
SKQKAB
TEMPO
1 2
SW3
D2
SKQKAH
1SS352 D3 1SS352
SW4
PEDAL_L
1 2
SKQKAB
1 2
SW5
D4
SKQKAH
1SS352
D5 1SS352
SW6
1 2 PEDAL_R
SKQKAB
1 2
D6
SW7
1SS352
SKQKAB
REVERSE
D7 1SS352
SW8
1 2
SKQKAB
1 2
D8
1SS352
CN2
C1
1/50
1
1
2
2
3
3
4
4
5
5
6
6
AN12 7
7
AN11 8
8
9
AN10
9
10
10
+
D 3. 3
11
11
WIRING 11P
TO CN2 ON
D
CENTER
BOARD
AVcc CN3
PEAK LED
1
1
POWER L ED
2
2
MIC I N
3
3
MIC O UT
4
4
5
5
6
6
INST O UT
7
7
INST IN
8
8
WIRING 8P
A
TO CN1 ON
JACK
BOARD
May. 2001