Pioneer SX-4 Service Manual

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CONTENTS
SPECIFICATIONS
F
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FACILITIES
PARTS
LOCATION
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SCHEMATIC
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ELECTR ICAL PABTS
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EXPLODED
VIEW
ADJUSTMENTS
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Type
Voltag€ Remarks
KU AC 12OV only
U.S.A. model
s AC 110V, 120V,220V and 24OV
(Switchable)
General export model
KC AC 12OV only
Canada
model
YP
AC 240V only
Australia model

Pioneer SX-4 Specifications

General

Brand	Pioneer
Model	SX-4
Category	Receiver
Language	English

Summary

Specifications

Amplifier Section

Details the performance characteristics of the audio amplifier section.

AM Tuner Section

Outlines the specifications for the AM radio tuner.

Front Panel Facilities

Power Switch

Describes the main power switch and its function.

Tuning Switch

Controls the station tuning process and frequency scanning.

FM Switch

Selects FM reception mode.

AM Switch

Selects AM reception mode.

Parts Location

Front Panel Components

Identifies controls and indicators on the front panel.

Block Diagram

FM Front End and IF Stages

Diagram of the FM signal reception frontend circuitry.

FM MPX Stereo Demodulator

Diagram illustrating the FM stereo demodulation process.

AM Tuner and Detector

Diagram of the AM signal reception and detection stages.

Tuning Detector and System Control

PLL Synthesizer Circuit

Power Amplifier and Supply

Diagrams of the power amplifier and power supply circuits.

Schematic Diagram

Complex Assembly Schematic

Detailed schematic for the complex assembly.

FM Front End and IF Stages Schematic

Schematic for FM signal reception frontend and IF stages.

Buffer Amplifiers and FM Tuner Circuits

AM Tuner and Stereo Buffer Schematic

FM Prescaler, PLL, and Tuner Control

Schematic for FM prescaler, PLL, and tuner control functions.

Tuner Detector and AM Amplifier Circuits

Power Amplifier and Output Stages

Schematic for the power amplifier and output stages.

Control Assembly Schematics (A & B)

Electrical Parts List

Complex Assembly Parts

Semiconductor Components

Resistor Components

Capacitors, Resistors, Semiconductors (Control GWX-721)

Exploded View

Exploded View of Main Unit Assemblies

Exploded View of Internal Assemblies

Adjustments

Idle Current Adjustment Procedure

Details the procedure for adjusting the unit's idle current.

FM Tuner Alignment Procedures

Step-by-step guide for aligning the FM tuner.

AM Tuner Alignment Procedures

Step-by-step guide for aligning the AM tuner.