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Yamaha B-2 Service Manual

Yamaha B-2
42 pages
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Yamaha B-2 Specifications

General IconGeneral
TypePower Amplifier
Frequency Response5Hz - 100kHz (±0.5dB)
Input Sensitivity0.775V
Signal-to-Noise Ratio100 dB
Dimensions430 x 170 x 430mm (W x H x D)
Weight12 kg
Damping factor100
Total Harmonic Distortion0.005%
Speaker load impedance4Ω - 16Ω
Power Output100 watts per channel into 8Ω (stereo)

Summary

Schematic Diagram

Selector SW Circuit Board NA06755

Details the circuit board for the selector switch.

Pin Jack Circuit Board NA06756

Describes the circuit board for the pin jack inputs.

Drive Circuit Board NA06747

Details the circuit board for the amplifier's drive stage.

Power Supply Circuit Board NA06749

Outlines the power supply circuit board.

Volume Circuit Board

Details the circuit board for volume control.

Connector Power FET Circuit Board NA06753

Shows the connector board for power FETs.

Meter & Lamp Circuit Board NA06751

Describes the circuit board for meters and lamps.

LED Circuit NA06760 x 2

Details the circuit board for LEDs.

Specifications

Power Amp Section

Details the technical specifications for the power amplifier.

Peak Meter Section

Outlines specifications for the peak meter functionality.

Others

Lists general specifications not covered elsewhere.

Components Location

Front Panel

Identifies components on the front of the unit.

Rear Panel

Locates components on the rear of the unit.

Views

Top View

Illustrates the layout of components from the top.

Bottom View

Shows the arrangement of components from the bottom.

Circuit Descriptions

Cascade Bootstrap Circuit

Explains the initial stage circuit design.

Differential Circuit

Describes the second stage differential amplifier.

Protective Circuit

Details the unit's protective mechanisms.

Automatic Bias Circuit

Explains the automatic bias adjustment system.

Pure Complementary Symmetrical Push-Pull Driver Circuit

Describes the push-pull driver circuit.

Speaker Protection Circuit

Details the circuit that protects speakers.

Input Circuit (Pin Jack Sheet)

Explains the input connection options.

Partial Disassembly

Removing the Top Cover

Instructions for removing the top panel.

Removing the Bottom Cover

Steps to remove the bottom panel.

Removing the Power Supply Circuit Board

Guide to remove the power supply board.

Removing the Power FET Unit

Instructions for removing the power FET unit.

Removing the Drive Circuit Board

Steps to remove the drive circuit board.

Removing the Power Supply Transformer

Guide to remove the power supply transformer.

Removing the Electrolytic Capacitor Circuit Board

Instructions for removing the electrolytic capacitor board.

Removing the Pin Jack Circuit Board

Steps to remove the pin jack circuit board.

Removing the Meter Amplifier and Lamp Circuit Board

Guide to remove meter/lamp boards.

Removing the Front Panel

Instructions for removing the front panel.

Removing the LED Circuit Board

Steps to remove the LED circuit board.

Removing the Power Switch

Guide to remove the power switch.

Removing the Peak Level Meter

Instructions for removing the peak level meter.

Removing the Selector Switch Circuit Board

Steps to remove the selector switch board.

Removing the Volume Circuit Board

Guide to remove the volume circuit board.

Measurement and Adjustment

Pre-Adjustment Procedures

Essential steps before making adjustments.

Overall Adjustments

General procedures for initial adjustments.

Adjusting the Power Supply Voltage

Steps to adjust power supply voltages.

Adjustments of the Main Amplifier

Procedures for adjusting the main amplifier.

Adjustments of the Meter Amplifier

Steps to adjust the meter amplifier section.

Printed Circuit Board

Pin Jack Circuit Board NA06756

Diagram of the pin jack circuit board.

Drive Circuit Board NA06747

Diagram of the drive circuit board.

Volume Circuit Board NA06754

Diagram of the volume circuit board.

Connector Circuit Board NA06753

Diagram of the connector circuit board.

Power FET Circuit Board NA06752

Diagram of the power FET circuit board.

Meter Amp Circuit Board NA06751

Diagram of the meter amp circuit board.

Power Supply Circuit Board NA06749 / NA06750

Diagrams for power supply boards.

Lamp Circuit Board NA06751

Diagram of the lamp circuit board.

Electrolytic Capacitor Circuit Board NA06748

Diagram of the electrolytic capacitor board.

FET and New Parts Symbols

Printed Special Characteristic

Block Diagram

Packeage

Parts List

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