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Sansui 661 Service Manual

Sansui 661
34 pages
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Sansui 661 Specifications

General IconGeneral
Power Output20 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.8%
Tuning RangeFM, MW
Damping Factor30
Input Sensitivity2.5mV (MM), 150mV (line)
Speaker Load Impedance4Ω to 16Ω
Channel Separation45dB

Summary

Specifications Overview

Audio Section Specifications

Detailed specifications for the audio output, distortion, and frequency response.

Tuner Section Specifications

Technical specifications for FM and AM tuning, sensitivity, and selectivity.

Block and Level Diagrams

Receiver Block Diagram

Illustrates the functional blocks and signal paths within the receiver.

Receiver Level Diagram

Depicts signal voltage levels at various stages of the receiver.

Dial Cord Threading

Alignments and Adjustments

Driver Circuit Board Adjustment

Procedures for adjusting bias current and DC offset on the driver circuit board.

FM IF Alignment

Steps to align the FM intermediate frequency (IF) coils for optimal reception.

FM Dial Calibration and RF Alignment

Procedures for calibrating the FM dial and aligning the radio frequency stage.

Troubleshooting Chart

Power Supply Troubleshooting

Identifies symptoms and causes for power supply failures and no-power conditions.

Audio Section Troubleshooting

Guides on troubleshooting audio output problems, bias current, and center voltage.

Tuner Section Troubleshooting

Covers troubleshooting for both FM and AM tuner sections, including signal meter and muting.

Parts Locations and Lists

F-1501 Pre Amplifier Board Parts

Lists components and their locations on the pre-amplifier circuit board.

F-1491A Tuner Board Parts

Lists components and their locations on the tuner circuit board.

F-1499A Driver Board Parts

Lists components and their locations on the driver circuit board.

F-1500A Power Board Parts

Lists components and their locations on the power circuit board.

Tuner Section Schematic

Audio Section Schematic

Packing List

Accessory Parts List

Maintenance

Voltage Adjustment Guide

Instructions for setting the unit's voltage selector for different power supplies.

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