Pioneer SX-7 - Service Manual

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b Model

SX-7.

ORDER

NO.

ARP-047-O

COMPUTER

CONTROLLED

STEREO

RECEIVER

sx-7

sx-6

SX-s.SiX-EiL

SX-,QISX-4L

The AM tuner of

SX-4L

wave-band tuner with MW

(long

wave).

and

SX-SL is a two

(medium

wave) and

Model

SX-7

(and

SX-6, SX-5 and SX-4)

are new

types of receivers featuring microcomputers for

easier

operation. The AM/FM tuner stages incorpo-

rate

quartz

PLL

synthesizers for high stability,

while the

power

amplifier stage is a non-switching

amplifier which

achieves class A

quality

with class

B efficiency

(not

included in the

SX-4

model).

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95.

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AUG.1981

Printed

lapan

Main Page

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Summary

Circuit Descriptions Overview

Outline of Main Stages

Overview of the main stages of the receiver, including tuner, amplifier, and display.

Tuner Stage Details

I.D. MOS FET in Tuner

Description of the I.D. MOS FET for improved sensitivity and reduced interference.

Pulse-Swallow PLL Synthesizer

Explanation of the pulse-swallow system for 25kHz step synthesizers.

Amplifier Stage Details

Non-Switching Amplifier Stage

Explanation of non-switching amplifier operation to suppress switching distortion.

Display Stage Features

LED Numeric Display

Description of LED numeric displays for frequency and volume control.

Signal Strength Indicator

Details on the 3-point LED SIGNAL indicator for signal strength.

Control Stage Operations

Microcomputer Control System

Overview of microcomputer ICs and system diagram for receiver control.

Function Selector Control

Description of key matrix for controlling receiver functions like PHONO, AUX, FM/AM.

Volume Control System

Details on electronic volume control IC for gain, balance, and muting.

Memory Hold Function

Explanation of RWM preservation for microcomputer data when power is off.