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

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PRE-MAIN UNIT

F-20B

Manual background PRE-MAIN UNIT

A120

A110

A100

 

 

 

 

 

 

 

 

 

A10

 

 

 

 

 

A70

 

A40

A140

A130

A60

 

 

 

 

 

 

A50

P80

A30

A10

A20

P20

P50

A80

A90

P75

P10

P90

P100

P70

P30 Amp Kit

P60

P77

P40

P60

P120 P110

4

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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
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