Block Diagram - Roland OD-20 Service Notes

Apr.2002

BLOCK DIAGRAM

fig.block
INPUT
JK1
BUFFER
2
3
Q1
1
PRE EMPHASI S
AF/AD
COMPARATOR
IC10
RIBON CABLE
DC IN
3pin
JK5
2
CN5 CN3
1
3
BATTERY CN4
16
BUFFER
Q12
IC1
IC2
CODEC
IC5
DSP
-9V
RESET
IC7
+
A 9
FILTER
Q10
+
D 3. 3
DC-DC CONVERTER
Q11, IC8
FET SW
Q2
DE EMPHASIS
FET SW
AMP Q8
IC3
TR SW TR SW
Q9 Q6
EEPROM
IC4
IC6
CPU
X2
11.2896MHz
1 2
X1
8MHz
OUTPUT
2
BUFFER
3
1
Q3
LINEOUT/PHONES
AMP,LPF 2
3
IC11
1
AMP CTRL
TR SW
2
Q4,Q5,Q7 3
1
JACK BOARD
PANEL BOARD
CN1
CN1
VR1,VR2,VR3,VR4
1 3
VR5,VR6,VR7
WIRING 10P
1 2 SW1,SW2,SW3
SW4,SW5,SW6
CN2
CN2
LED1,LED2,LED3,LED4
LED5,LED6,LED7,LED8
WIRING 15P 1 2
LED9,LED10,LED11,LED12
OD-20(T)
JK4
JK3
JK2
17