Yamaha Bass Amplifier service manual F-20B 4.MAIN 2/2 Circuit Board, Time required about 3 min

Contents CONTENTS BASS AMPLIFIERIMPORTANT NOTICE F-20BWARNING CHEMICAL CONTENT NOTICE IMPORTANT NOTICE FOR THE UNITED KINGDOMSPECIFICATIONS PANEL LAYOUTF-20B POWER AMP BLOCK DIAGRAMCIRCUIT BOARD LAYOUT POWER TRANSFORMER2.Speaker Time required about 2 min DISASSEMBLY PROCEDURE1.Pre-MainUnit Time required about 2 min F-20B5.Power Transformer Time required about 4 min F-20B 4.MAIN 2/2 Circuit BoardTime required about 3 min CIRCUIT BOARDS F-20B3.Inspection procedure IC BLOCK DIAGRAM2.Power supply INSPECTIONSBASS AMPLIFIER CONTENSPARTS LIST F-20BF-20B OVERALL ASSEMBLY10 Overall Cabinet Assembly 20 Pre-MainUnitREMARKS F-20BDESCRIPTION New partsPRE-MAINUNIT F-20B V 6 9 5 4 8 0 0 ChassisELECTRICAL PARTS F-20BF-20B HF456330F-20B OVERALL CIRCUIT DIAGRAMABCDEFG P.1 5 F-20B