Pre-Mainunit | Yamaha F-20B, Bass Amplifier specification

F-20B

PRE-MAIN UNIT

A50

P80

A30

A10

A20

P20

P50

A80

A90

P75

P10

P90

P100

P70

P30 Amp Kit

P60

P77

P40

P60

P120 P110

Image 12

Contents

CONTENTS BASS AMPLIFIER F-20B WARNING CHEMICAL CONTENT NOTICEIMPORTANT NOTICE IMPORTANT NOTICE FOR THE UNITED KINGDOM SPECIFICATIONS PANEL LAYOUTF-20B BLOCK DIAGRAM CIRCUIT BOARD LAYOUTPOWER AMP POWER TRANSFORMER DISASSEMBLY PROCEDURE 1.Pre-MainUnit Time required about 2 min2.Speaker Time required about 2 min F-20B 5.Power Transformer Time required about 4 min F-20B 4.MAIN 2/2 Circuit BoardTime required about 3 min CIRCUIT BOARDS F-20B IC BLOCK DIAGRAM 2.Power supply3.Inspection procedure INSPECTIONS CONTENS PARTS LISTBASS AMPLIFIER F-20B OVERALL ASSEMBLY 10 Overall Cabinet AssemblyF-20B 20 Pre-MainUnit F-20B DESCRIPTIONREMARKS New parts PRE-MAINUNIT F-20B V 6 9 5 4 8 0 0 Chassis ELECTRICAL PARTS F-20B F-20B HF456330 OVERALL CIRCUIT DIAGRAM ABCDEFG P.1F-20B 5 F-20B