Circuit Board Layout - Yamaha F-20 Service Manual

F-20

CIRCUIT BOARD LAYOUT

Top View
©
Front View
©
BLOCK DIAGRAM
MAIN 1/2
OP AMP
+12V
INPUT
3 1
IC1
-12V
JK1
GAIN
VR2
POWER SWITCH
T1
SW1
T2
U, C, S, BS
4
MAIN 2/2
MAIN 1/2
CH. SELECT SW
CH. A CH. B
CLEAN DRIVE
+B
SW2
OP AMP
VOLUME
5
IC1
VR1
-12V
OP AMP
INDICATOR
+12V
3 1
IC2
CH. A CH. B
MASTER CLEAN DRIVE
-12V
VR3
FUSE
FZ1
CN2 4P
T1
G
T2
POWER TRANSFORMER
AC Cord
MAIN 1/2
OP AMP
IC1. IC2
+12V +12V
PASSIVE TYPE
7 5 7
IC2
TONE CONTROL
-12V
VR4 VR5 VR6
POWER SUPPLY CIRCUIT
Side View
©
Power Transformer
MAIN 2/2
MAIN 1/2
V695450
JK3
MAIN 2/2
+B
1 4
IC3
POWER
-B AMP
T3
T4
+B
+12V
-12V
-B
JK2
AUX IN
4Ω Speaker
PHONES