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Pioneer SX-950 User Manual

Pioneer SX-950
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AM/FM
STEREO
RECEIVER
SX-950
OPERATING
INSTRUCTIONS
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Pioneer SX-950 Specifications

General IconGeneral
Total Harmonic Distortion0.1%
Tuning RangeFM, MW
Damping Factor30
Input Sensitivity2.5mV (MM), 150mV (line)
Speaker Load Impedance4Ω to 16Ω
TypeStereo Receiver
Year1976
Signal to Noise Ratio95dB (line)
Power Output85 watts per channel into 8Ω (stereo)

Summary

IMPORTANT-LINE VOLTAGE

CHANGING THE LINE VOLTAGE SETTING

Instructions for adjusting the voltage selector plug to match local mains supply.

STEREO SYSTEM LAYOUT AND SETUP

Tape Deck Setup

Guidelines for using tape decks, including maintenance and proper placement for optimal performance.

Turntable Setup

Recommendations for turntable placement and record storage to protect from vibrations and dust.

Speaker System Setup

Advice on speaker placement for optimal sound quality and vibration isolation.

Furniture Considerations

Notes on how furniture materials can affect audio tone and sound reproduction quality.

Carpet Effect

Information on carpet's role in absorbing sound and vibrations for better acoustics.

PIONEER SX-950 KEY FEATURES

Advanced FM Front End

Dual gate MOS FETs in the FM front end provide superior sensitivity and overload resistance.

High Selectivity IF Stages

Ceramic filters and IC limiters ensure stable operation and sharp selectivity in IF stages.

PLL MPX Demodulator

Quadrature detector and PLL circuit for clear FM separation and minimal distortion.

Reduced Distortion AM Circuit

AM tuner circuit with AGC and ICs for improved selectivity and reduced distortion.

Heavy Duty Split Power Supply

Robust power supply with large capacitors and protection for equipment safety.

Precision RIAA Phono Equalizer

Accurate RIAA equalization for phono inputs ensuring wide dynamic range.

High Reliability Protection Circuit

Relay circuit safeguards transistors and speakers from DC voltage or overload.

Tone Controls & Turnover Selectors

Precise tone controls with selectable turnover frequencies and tone bypass for flexible audio adjustment.

Direct Coupled Power Amplifier

85W per channel amplifier with direct coupling and low harmonic distortion.

Additional Features

Includes dual tape monitors, microphone input, and audio muting for enhanced versatility.

Stylish Design and Build

Elegant design featuring an aluminum front panel trimmed with solid walnut.

RECEIVER CONNECTION DIAGRAM

Outdoor FM Antenna Connection

Diagram illustrating the connection of an outdoor FM antenna to the receiver.

T-Type FM Antenna Connection

Diagram showing the setup for connecting a T-type FM antenna.

AM Antenna Connection Options

Diagram detailing connections for indoor or outdoor AM antennas.

Turntable Input Connection

Schematic showing how to connect turntables to the receiver's PHONO inputs.

Cartridge Tape Player Connection

Diagram illustrating the connection of a cartridge tape player.

Pre/Power Amp Jack Explanation

Explanation of PRE OUT and POWER IN jacks and their connecting plugs for amplifier configurations.

Speaker System A Connection

Diagram showing the connection of Speaker System A to the receiver's outputs.

UK SPECIFIC USAGE AND SAFETY

UK 240V Mains Voltage Caution

Warning regarding the 240V mains supply voltage setting for use in the United Kingdom.

UK Mains Lead Wiring Color Code

Details the wire colour code (Green-Yellow, Blue, Brown) for safe mains lead connections.

CONNECTING COMPONENTS

Speaker System Connection Guide

Instructions for connecting speaker systems to terminals A, B, C, ensuring correct polarity and impedance.

Turntable Connection Guide

Guide for connecting turntables to PHONO 1 and PHONO 2 jacks, including ground wire.

Using Auxiliary Input Jacks

Explanation of how to connect and utilize auxiliary audio components via the AUX input jacks.

Speaker Wire Preparation and Connection

Step-by-step guide on preparing speaker lead wires and connecting them securely to terminals.

ANTENNA AND GROUNDING CONNECTIONS

FM Antenna Setup and Connection

Guidance on connecting FM antennas, covering outdoor and T-type options for optimal reception.

AM Antenna Setup and Connection

Instructions for connecting AM antennas, including ferrite bar and indoor/outdoor types.

Ground Connection for Safety

Explanation of connecting the GND terminal to an earth ground for safety and noise reduction.

FRONT PANEL CONTROLS AND FEATURES

Speaker Output Selection Buttons

Explains the function of speaker system selection buttons (A, B, C) and their combinations.

Headphone Output Jack

Describes the stereo headphone output jack for private listening.

Power Switch Delay Feature

Notes the delay before sound output due to the protection circuit activation.

Bass Control Operation

How the bass control affects low frequencies relative to the turnover switch setting.

Bass Turnover Frequency Selector

Allows selection of bass turnover frequency (400Hz or 200Hz) for tone adjustment.

Tone Control Bypass Switch

Explains the tone switch for engaging or bypassing tone controls for a flat frequency response.

Treble Turnover Frequency Selector

Allows selection of treble turnover frequency (2.5kHz or 5kHz) for tone adjustment.

Treble Control Operation

How the treble control affects high frequencies relative to the turnover switch setting.

FM Tuning Meter Indicator

Describes the FM tuning meter for accurately tuning radio stations.

Signal Meter for Tuning

How to use the signal meter for optimizing AM and FM station tuning.

Low Cut Filter Function

Attenuates low-frequency rumble and noise below 30Hz.

High Cut Filter Function

Attenuates high-frequency scratch noise and hiss above 6kHz.

MPX Noise Filter Button

Eliminates FM stereo hiss, potentially reducing separation slightly.

TUNING KNOB AND RECEIVER CONTROLS

Program Source Indicator Lamp

Visual display indicating the currently selected audio source.

Function Selector Button Guide

Buttons used to select the audio input source (AM, FM, PHONO, AUX).

Microphone Input Jack

Standard 6mm jack for connecting a microphone.

Audio Muting Switch Function

Reduces audio output by 20dB temporarily without altering volume control.

Volume Control Operation

Controls the overall sound output level for speakers and headphones.

Loudness Control Function

Enhances bass and treble at low volumes to compensate for hearing perception.

Mode Selection (Stereo/Mono)

Allows selection between STEREO and MONO playback modes.

Balance Control Adjustment

Adjusts the sound balance between left and right audio channels.

Adaptor Switch Operation

Activates external adaptor components like equalizers or Dolby units.

Tape Monitor Switches

Enables tape playback monitoring through selected tape jacks.

Tape Duplicate Switch

Allows duplicating or editing tapes between two connected tape decks.

FM Muting Button Function

Suppresses interstation noise during FM tuning; can be disabled for weak signals.

RECEIVER OPERATION GUIDE

Initial Control Setup Before Power On

Initial setup of various controls before powering on the receiver for safe operation.

Optimizing FM Radio Reception

Step-by-step instructions for tuning and optimizing FM radio reception.

Optimizing AM Radio Reception

Step-by-step instructions for tuning and optimizing AM radio reception.

RECORD PLAYBACK AND MICROPHONE USAGE

Using Auxiliary Input Jacks for Playback

How to connect and play external audio sources via the receiver's AUX input jacks.

Microphone Connection and Usage

Instructions for connecting and using a microphone with the receiver.

Protection Circuit Functionality

Explains the protection circuit's function and troubleshooting for extended silence or clicks.

Turnover Switch Functions Explained

Details the function of bass and treble turnover switches for adjusting frequency response.

TAPE DECK CONNECTION AND OPERATION

Tape Deck Connection Methods

Guides on connecting tape decks to the receiver's REC/PLAY and DIN jacks for recording and playback.

Tape Deck Recording Connections

How to connect tape decks for recording using the receiver's output jacks.

Tape Deck Playback Connections

How to connect tape decks for playback using the receiver's input jacks.

Tape Playback Operation

Steps for playing back tapes using TAPE MONITOR or ADAPTOR switches.

TAPE MONITORING AND DUBBING

Recording Audio to Tape Decks

How to record audio from selected sources to tape decks via receiver output jacks.

Duplicating and Editing Tapes

Instructions for copying tapes using two tape decks and the TAPE DUPLICATE switch.

ADAPTOR JACKS FOR ENHANCED FUNCTIONALITY

Using the Dolby NR Adaptor

How to use a Dolby adaptor for FM broadcasts and tape recording/playback.

Receiving Dolby FM Broadcasts

Steps to receive Dolby system FM broadcasts using the connected adaptor.

Connecting Other Audio Adaptors

Information on connecting other adaptors like graphic equalizers via REC/PLAY jacks.

Dolby Adaptor Recording Setup

Connecting Dolby adaptor output to tape deck input jacks for recording.

Dolby Adaptor Playback Setup

Connecting tape deck output jacks to Dolby adaptor input for playback.

SETTING UP A 4-CHANNEL SYSTEM

4-Channel System Connection and Operation

Steps to connect and operate a 4-channel system using the receiver and adaptors.

4-Channel Speaker System Placement

Guide on optimal speaker placement for 4-channel systems (front and rear configurations).

Receiving 4-Channel FM Broadcasts

How to use a 4-channel FM broadcast adaptor for discrete FM reception.

USING PRE OUT AND POWER IN JACKS

Separating Pre-Amplifier and Power Amplifier

How to use PRE OUT and POWER IN jacks to separate pre-amplifier and power amplifier sections.

Independent Preamplifier Operation

Using the pre-amplifier section alone to drive an external power amplifier.

Multi-Amplifier System Configuration

Connecting crossover networks and multiple amplifiers for advanced multi-way audio systems.

TROUBLESHOOTING COMMON MALFUNCTIONS

Troubleshooting Broadcast Noise

Troubleshooting noise issues encountered when listening to radio broadcasts.

Troubleshooting Record Playback Noise

Troubleshooting noise and howling issues during record playback.

Troubleshooting Microphone Noise

Troubleshooting noise and feedback issues when using the microphone.

RECEIVER SPECIFICATIONS

Semiconductor Component Listing

Lists the types and quantities of semiconductors (FETs, ICs, Transistors, Diodes) used.

Power Amplifier Section Specs

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

Preamplifier Section Specifications

Lists input sensitivities, impedance, overload levels, and output characteristics.

FM Section Performance Data

Provides specifications for FM reception: sensitivity, selectivity, and stereo separation.

AM Section Performance Data

Provides specifications for AM reception: sensitivity and selectivity.

AM SECTION AND GENERAL INFORMATION

AM Section Performance Details

Further details on AM section performance specifications.

Miscellaneous Product Specifications

Includes power requirements, dimensions, weight, and furnished parts.

Hex Wrench Accessory Usage

Explains the accessory hex wrench for tuning knob adjustments and setscrew tightening.

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