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Sansui 771 Service Manual

Sansui 771
28 pages
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Sansui 771 Specifications

General IconGeneral
Frequency Response20Hz to 30kHz
Total Harmonic Distortion0.5%
Tuning rangeFM, MW
Damping factor30
Input Sensitivity2.5mV (MM), 150mV (line)
Speaker load impedance4Ω to 16Ω
Channel separation50dB (line)

Summary

1. Specifications

Audio Section Specifications

Details power output, distortion, frequency response, and input specifications for the audio section.

Tuner Section FM Specifications

Lists FM tuning range, distortion, sensitivity, selectivity, and other performance characteristics.

Tuner Section AM Specifications

Details AM tuning range, sensitivity, selectivity, and rejection specifications.

2. Block Diagram and Level Diagram

4. Alignments and Adjustments

4-1. Driver Circuit Board Adjustment

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

4-2. FM IF Alignment

Instructions for aligning the Intermediate Frequency (IF) stages of the FM tuner.

5. Troubleshooting Chart

5-1. Power Supply Troubleshooting

Identifies symptoms, check points, and causes for power supply related issues.

5-2. Audio Section Troubleshooting

Lists common audio problems, their checks, and potential causes.

5-3. Tuner Section Troubleshooting

Covers troubleshooting steps for both FM and AM tuner sections.

7. Schematic Diagram of Tuner Section

8. Schematic Diagram of Audio Section

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