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Sansui AU-7900 Service Manual

Sansui AU-7900
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Sansui AU-7900 Specifications

General IconGeneral
Total Harmonic Distortion0.1%
Damping Factor50
Input Sensitivity2.5 mV (MM), 150 mV (line)
Speaker Load Impedance8Ω to 16Ω
Channel Separation55dB (MM)
OutputHeadphone Out
Power Output75 watts per channel into 8Ω (stereo)

Summary

Sansui AU-5900/6900/7900 Service Manual

Block Diagram Overview

Product Specifications

AU-5900 Specifications

Technical specifications for the Sansui AU-5900 stereo amplifier, including power output, impedance, and distortion.

AU-6900 Specifications

Technical specifications for the Sansui AU-6900 stereo amplifier, including power output, impedance, and distortion.

AU-7900 Specifications

Technical specifications for the Sansui AU-7900 stereo amplifier, including power output, impedance, and distortion.

Parts Location and Component Lists

F-2596 Power Amplifier Circuit Board

Conductor side layout and parts list for the F-2596 Power Amplifier Circuit Board.

Parts Location and Component Lists (cont.)

Circuit Boards: F-2598 through F-2603

Parts lists and location diagrams for circuit boards F-2598, F-2599, F-2600, F-2601, F-2602, and F-2603.

Parts Location and Component Lists (cont.)

Circuit Boards: F-2608 through F-2611

Parts lists and location diagrams for circuit boards F-2608, F-2609, F-2610, and F-2611.

Parts Location and Component Lists (cont.)

Circuit Boards: F-2606 through F-2605

Parts lists and location diagrams for circuit boards F-2606, F-2607, F-2604, and F-2605.

Parts Location and Component Lists (cont.)

Semiconductor Component Identification

Illustrations and circuit board references for various semiconductor components.

Parts Location and Component Lists (cont.)

Other Parts Identification

List and identification of miscellaneous parts, including terminals, jacks, and outlets.

Other Parts Identification (cont.)

Exploded View and Parts Identification

Chassis and External Components

Exploded view identifying chassis parts, knobs, switches, jacks, and power transformer.

Troubleshooting Guide - Section 4

Operational Block Diagrams

Block diagrams for Power Amplifier and Power Supply/Protector circuits.

Troubleshooting Power Amplifier and Supply Circuits

Common troubleshooting steps and issues for power amplifier, supply, and protector circuits.

Tone Control Circuit Functions

Details the functions of tone control circuits across different amplifier models.

Schematic Diagrams - Section 5

AU-5900 Schematic Diagram

Detailed schematic diagram for the Sansui AU-5900 stereo amplifier.

AU-6900 Schematic Diagram

Detailed schematic diagram for the Sansui AU-6900 stereo amplifier.

Schematic Diagrams - Section 5 (cont.)

AU-7900 Schematic Diagram

Detailed schematic diagram for the Sansui AU-7900 stereo amplifier.

Adjustment Procedures

Driver Circuit Board Adjustment

Procedure for adjusting the driver circuit board bias and settings.

Power Transistor Replacement

Step-by-step guide for replacing power transistors on the amplifier.

Packing and Accessory Lists

Packing List

List of items included in the product packaging.

Accessory Parts List

List of optional or included accessory parts for the amplifier.

Common Parts Lists: Resistors & Capacitors

Resistor Component Data

Capacitor Component Data

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