Yamaha F-20B, Bass Amplifier service manual Pre-Mainunit

Contents CONTENTS BASS AMPLIFIERF-20B WARNING CHEMICAL CONTENT NOTICEIMPORTANT NOTICE IMPORTANT NOTICE FOR THE UNITED KINGDOMSPECIFICATIONS PANEL LAYOUTF-20B BLOCK DIAGRAM CIRCUIT BOARD LAYOUTPOWER AMP POWER TRANSFORMERDISASSEMBLY PROCEDURE 1.Pre-MainUnit Time required about 2 min2.Speaker 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-20BIC BLOCK DIAGRAM 2.Power supply3.Inspection procedure INSPECTIONSCONTENS PARTS LISTBASS AMPLIFIER F-20BOVERALL ASSEMBLY 10 Overall Cabinet AssemblyF-20B 20 Pre-MainUnitF-20B DESCRIPTIONREMARKS New partsPRE-MAINUNIT F-20B V 6 9 5 4 8 0 0 ChassisELECTRICAL PARTS F-20BF-20B HF456330OVERALL CIRCUIT DIAGRAM ABCDEFG P.1F-20B 5 F-20B