Yamaha Bass Amplifier Musical Instrument Amplifier User Manual


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