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Pioneer SX-650 Service Manual

Pioneer SX-650
102 pages
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Table of Contents

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Pioneer SX-650 Specifications

General IconGeneral
Power Output35 watts per channel into 8Ω (stereo)
Frequency Response20Hz to 20kHz
Tuning RangeFM, MW
Speaker Load Impedance4Ω to 16Ω
Total Harmonic Distortion0.3%
Input Sensitivity2.5mV (MM), 150mV (line)
Output150mV (line)
Dimensions480 x 149 x 349 mm

Summary

1. Specifications

2. Front Panel Facilities

Front Panel Controls

Details operation of volume, bass, treble, balance, loudness, and function selector controls.

Front Panel Indicators

Describes the power indicator lamp and stereo indicator lamp.

Front Panel Switches

Explains functionality of high filter, FM muting, mode, and tape monitor switches.

3. Connection Diagram

Rear and Top Views

Illustrates rear panel connections and top view of accessory AC outlets.

4. Circuit Descriptions

Tuner and Decoder Circuits

Explains AM/FM tuner, IF amplifier, and multiplex decoder operations.

Audio and Control Circuits

Details phono equalizer, microphone, tone control, and power amplifier stages.

Protection and Power Supply

Covers the protection circuit and the power supply system.

5. Block Diagram

System Block Diagram

Overview of the receiver's functional blocks from antenna to output.

6. Level Diagram

Signal Level Flow

Depicts signal level changes (dB) through amplifier stages.

7. Disassembly

Disassembly Procedures

Step-by-step guide for removing top cover, bottom plate, and front panel.

8. Dial Cord Stringing

Dial Cord Installation Guide

Instructions for properly stringing the tuning dial cord.

9. Parts Locations

External Component Views

Identifies parts on front, rear, top, and bottom panels.

10. Adjustments

Alignment and Adjustment Steps

Procedures for tuning and aligning AM, FM, and MPX sections.

11. Exploded Views

Exterior and Chassis Exploded Views

Shows exploded views of exterior parts and the main chassis.

Internal Assembly Exploded Views

Exploded views of tuner, amplifier, power supply, and rear panel assemblies.

12. Schematic Diagrams and Parts Lists

Component Parts Lists

Lists all parts for various assemblies including semiconductors, resistors, and capacitors.

Circuit Schematics

Detailed schematics for key assemblies like Tuner, Amplifier, and Power Supply.

13. Packing

Packing Materials and Procedures

Lists all materials and steps for packing the unit.

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