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Pioneer SX-1280 Service Manual

Pioneer SX-1280
100 pages
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XRABi3

Table of Contents

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Pioneer SX-1280 Specifications

General IconGeneral
Power Output185 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.03%
Input Sensitivity2.5mV (MM), 150mV (line)
Tuning RangeFM, MW
Year Introduced1978
Weight29.7kg
Channel Separation60dB (MM), 70dB (line)

Summary

Specifications

Connection Diagram

Audio and Antenna Connections

Diagrams showing turntable, player, and antenna connections to the receiver.

Speaker and Power Connections

Diagrams illustrating speaker system connections and AC power outlet usage.

Front Panel Controls and Operation

Main Controls: Power, Volume, Tuning, and Function

Explanation of primary controls like power switch, volume, tuning knob, and function buttons.

Block Diagram and Circuit Descriptions

System Block Diagram Overview

High-level block diagram illustrating the receiver's main functional sections.

Tuner Section Circuits

Detailed description of AM and FM tuner front-end, IF amplifier, and MPX decoder circuits.

AF Section Circuits

Explanation of microphone input, PHONO input, and equalizer amplifier circuits.

Amplifier Stages, Power Supply, and Protection Circuits

Description of flat amp, tone controls, filter circuits, power amp, and protection circuits.

Adjustments and Calibration

FM Tuner and MPX Decoder Alignment

Procedures for aligning FM tuner sections and calibrating the MPX decoder.

Schematic Diagrams and Part Lists

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