Pioneer PD-7050 Service Manual

© <riw the sereicing these models, please refer to the following service ruiarsisai.
o PD-7050/KU, KC, HEM, HB, SD types and PD-7050-S/HEM type; ARP1331
o PD-6050/KU, KC, HEM, HB, SD, SD/G types and PD-6050-S/HEM type; ARP1329
o PD-5050/HEM, HBtypesand PD-5050-S/HEM type;ARP1330
e PD-40S0/KU, KC, HEM, HB, HP, SD, SD/G types and PD-405G-S/HEM, HB types; ARP1332
CONTENTS
1. IC DATA 2
2. OPTICAL PATH IN THE PICK-UP 8
3. BLOCK DIAGRAM 11
4. CIRCUIT DESCRIPTIONS . 13
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1 -Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. P.O. Box 1760, Long Beach, California 90801 U.S.A.
PIONEER ELECTRONICS OF CANADA, INC. 505 Cochrane Drive, Markham, Ontario L3R 6B8 Canada TEL: [416] 479-4411
PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1, 2740 Beveren, Belgium TEL: 03/775 -28-08
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [03] 580-9911
MT ©MAR. 1987 Printed in Japan

Pioneer PD-7050 Specifications

General

Type	CD Player
Disc format	CD
Channels	2
Dynamic Range	100dB
Signal-to-Noise Ratio	115dB
Frequency Response	2Hz to 20kHz
Output Level	2V
Digital outputs	Coaxial
Dimensions	420 x 113 x 340 mm

Summary

IC Data Specifications

PD3091A IC Pinout and Functions

Details pin configuration and operational descriptions for the PD3091A IC.

PD3092A IC Pinout and Functions

Outlines pin assignments and terminal descriptions for the PD3092A IC.

PD3093A IC Pinout and Functions

Provides pinout and terminal descriptions for the PD3093A IC.

Optical Pick-up Path and Components

Optical Path and Components Overview

Explains the light path and identifies key optical components like the laser diode and objective lens.

Optical Part Features and Improvements

Describes the specific characteristics and improvements of optical parts like the laser diode and objective lens.

RF and Servo Signal Generation

Details how RF and servo signals are generated and processed from disc reflections.

System Block Diagram

Circuit Descriptions and Systems

4.1 Accurate Focus Servo System

Explains the circuitry and method for maintaining accurate focus on the disc.

CXA1082AS IC Details

Details the functions and pin assignments of the CXA1082AS integrated circuit.

Tracking and Carriage Servo System

Details the servo systems responsible for tracking disc pits and moving the carriage.

Spindle Servo and LPF Circuitry

Describes the spindle servo control and low-pass filter (LPF) configurations.

VCO Loop Filter and Frequency Control

Explains the voltage-controlled oscillator (VCO) loop filter and its frequency control.

4.3 TOC Reading Process

Describes the procedure for reading the Table of Contents from the disc.

4.4 Carriage Servo System Operation

Explains the drive voltage and control for the carriage movement.

4.5 Demodulator Functions

Outlines the functions of the demodulator, including EFM processing and error correction.

4.6 Digital Level Control

Details the digital attenuator IC for controlling audio output levels.