Yamaha Bass Amplifier - Manual
This repair manual covers the Yamaha Bass Amplifier F-20B, focusing on its technical specifications, disassembly procedures, circuit diagrams, and component inspection for maintenance and troubleshooting. The document details essential topics like front-panel controls (input, volume, equalizer knobs), wiring standards (UK-specific color-coding), and detailed schematics of key components–such as the pre-main unit, main circuit boards, and power transformer–to aid authorized servicing. It also includes exploded views for assembly reference, parts lists with regional specifications (primarily Japan), and warnings about specialized or critical components requiring careful handling.
Table of Contents:
- Page 1 – Service Manual Overview and Specifications
- Page 2 – Safety and Electrical Service Notices
- Page 3 – Amplifier Specifications and Front Panel Layout
- Page 4 – Electronic Circuit Board Layout
- Page 5 – Disassembly Procedure
- Page 6 – Removal of Main Components
- Page 7 – MAIN1/2 Circuit Board Schematics and Ratings
- Page 8 – Internal Component Inspection Procedure
- Page 9 – Bass Amplifier Parts List
- Page 10 – Overall Assembly Exploded Diagram
- Page 11 – Cabinet and Overall Assembly Parts List
- Page 12 – Pre-Main Unit Component Diagram
- Page 13 – Detailed F-20B Parts List
- Page 14 – Electrical Component Inventory
- Page 15 – Detailed Component Specifications List
- Page 16 – Main Audio Signal Circuit Diagram
SERVICE MANUAL
HAMAMATSU, JAPAN
1.507K-033 K
Printed in Japan 2001.08
011592
GA
20010720-17800
CONTENTS
SPECIFICATIONS .............................................................................. 3
PANEL LAYOUT .................................................................................. 3
CIRCUIT BOARD LAYOUT ................................................................. 4
BLOCK DIAGRAM .............................................................................. 4
DISASSEMBLY PROCEDURE ........................................................... 5
CIRCUIT BOARDS ............................................................................. 7
IC BLOCK DIAGRAM .......................................................................... 8
INSPECTIONS .................................................................................... 8
BASS AMPLIFIER
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About this manual
- Brand
- Yamaha
- Model
- Bass Amplifier
- Document type
- Manual
- Language(s)
- English
- Pages
- 16
- File size
- 1.4 MB
- Format
Summary
Table of contents listing sections, product image, specifications, panel layout, circuit diagrams, disassembly procedure, and parts list.
Important safety warnings for servicing by authorized personnel, static discharge precautions, chemical hazards from solder, and specific electrical connection requirements including wire color coding.
Technical data including output power, speaker size, controls, terminals, power requirements, dimensions, weight, and a labeled diagram of the front panel showing components like inputs and controls.
