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Pioneer SX-620 User Manual

Pioneer SX-620
19 pages
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Pioneer SX-620 Specifications

General IconGeneral
TypeStereo Receiver
Tuning RangeFM, MW
Total Harmonic Distortion0.8%
Speaker Load Impedance4Ω to 16Ω
Frequency Response20Hz to 20kHz
Input Sensitivity200 mV (line)
Signal to Noise Ratio70dB
Power Output20 watts per channel into 8Ω (stereo)

Summary

1. Specifications

Amplifier Performance

Details power output, distortion, sensitivity, and frequency response for the amplifier section.

Tuner Performance Metrics

Lists FM/AM sensitivity, selectivity, separation, and noise specifications.

Tone, Balance, and Loudness Controls

Describes the function and effect of tone, balance, and loudness controls.

Miscellaneous Technical Data

Includes power requirements, consumption, dimensions, and weight specifications.

Included Accessories

Lists supplied items such as operating instructions and antennas.

2. Front Panel Controls and Indicators

Power Switch and Indicators

Covers the power switch, power meter, speaker indicators, and function indicators.

Tuning and Signal Meters

Details the dial pointer, AM/FM tuning meter, and FM stereo indicator.

Input Selection and Tuning Knob

Describes the function selector for source selection and the tuning knob.

Audio Adjustment Controls

Explains the operation of bass, treble, balance, volume, and loudness controls.

Mode, Muting, and Monitoring Switches

Explains mode/muting, tape monitor, and speaker selection switches.

Headphone Jack

Describes the headphone output jack for private listening.

3. System Block Diagram

FM and AM Tuner Signal Paths

Illustrates the signal flow through the FM and AM tuner sections.

Audio and Power Stage Overview

Shows the signal path from audio inputs to the output stages, including power supply.

4. Circuit Descriptions

RF and IF Circuitry

Explains the FM/AM RF front ends, IF stages, and detector circuits.

Audio Amplifier and Decoder Circuits

Details the audio amplifier, equalizer, and MPX stereo decoder circuits.

Power Indicator Circuitry

Describes the circuit operation for the power level indicators.

5. Disassembly Instructions

Exterior Component Removal Steps

Guides on removing outer panels like side, top, bottom, and front panels.

6. Parts Location and Identification

Front Panel Component Layout

Identifies key components and parts on the front panel assembly.

Internal Component Layouts

Shows the layout of components on the rear panel and top internal views.

7. Dial Cord Stringing Procedure

Step-by-Step Cord Routing

Detailed, illustrated steps for correctly stringing the dial cord.

8. Service Adjustments and Calibration

Power Amplifier Idle Current Calibration

Procedures for setting the correct idle current for amplifier channels.

Power Indicator Level Calibration

Steps to calibrate the power output meter segments accurately.

FM Tuner Alignment Procedures

Adjustments for FM front end tracking and multiplex decoder.

AM Tuner Alignment Procedures

Steps for aligning the AM tuner stages for optimal performance.

9. PC Board Connection Diagrams

Main Board and Assembly Wiring

Illustrates wiring connections on the main PC board and various assemblies.

10. Schematic Diagrams

Full Circuit Schematics

Detailed electrical schematics for the entire receiver circuit.

Semiconductor Identification

Visual representations and types of semiconductors used in the unit.

11. Electrical Parts List

Miscellaneous and Fuse/Lamp Parts

Lists common components like fuses, lamps, switches, and transformers.

Semiconductor Parts List

Comprehensive list of transistors, ICs, and diodes by part number.

Assembly and Tuner/AF Parts

Lists specific PC board assemblies and components for the tuner/AF section.

Capacitor, Resistor, and Coil Parts

Details various passive components including capacitors, resistors, and coils.

12. Exploded View Diagrams

Exterior Component Breakdown

Illustrates how external parts of the receiver fit together for disassembly.

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