Overall Circuit Diagram - Yamaha F-20B Service Manual

A B
<P.1>

OVERALL CIRCUIT DIAGRAM

MAIN 1/2
INPUT
POWER ON/OFF
Note: See parts list for details of circuit board component parts.
F-20B
C
GAIN SELECT
OP AMP
OP AMP
BASS
OP AMP
OP AMP
J, U, C S, BS
250V 315mA 250V T160mA L
TRANS
FORMER
D E
OP AMP OP AMP
LOW MID HIGH MID TREBLE
OP AMP
VOLUME
F G
D2SBA20 (VP344100)
DIODE STACK 1.5A 200V
OP AMP
AUX IN
MAIN 2/2
HIFI AMP
KEC-54238
PHONES
4 SPEAKER
KEC-54238
WARNING
Components having special characteristics are marked
replaced with parts having specifications equal to those originally installed.
H
F-20B
1
DB1
2
3
4
5
and must be
F-20B