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Technics SL-PG490 Service Manual

Technics SL-PG490
36 pages
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Technics SL-PG490 Specifications

General IconGeneral
TypeCD Player
Disc FormatCD, CD-R, CD-RW
Frequency Response2 Hz to 20 kHz
Dynamic Range96 dB
Channels2 (Stereo)
Digital OutputOptical
Digital Converter1-bit DAC
Line Output2V (at 0 dB)

Summary

Specifications

Audio Specifications

Technical specifications for audio performance parameters.

General Specifications

Technical specifications for general parameters like power and dimensions.

Pickup Specifications

Technical specifications related to the optical pickup unit.

Handling Precautions

Traverse Deck Handling

Precautions for handling the optical pickup to prevent electrostatic damage.

Electrostatic Discharge Prevention

Procedures for grounding to prevent electrostatic discharge during servicing.

Laser Diode Precautions

Accessories

Connections

Analog Audio Connections

Diagram and instructions for analog audio connections.

Digital Audio Connections

Diagram and instructions for digital audio connections.

AC Mains Lead Caution (United Kingdom)

Controls and Remote

Main Unit Controls

Identification and function of controls on the main unit.

Remote Control Functions

Identification and function of buttons on the remote control.

Sequential Playback

Operation Checks and Component Replacement

Printed Circuit Board (PCB) Checks

Steps for checking the operation of various PCBs.

Main Component Replacement

Procedures for replacing major components of the unit.

Traverse Unit Replacement

Loading Belt and Motor Replacement

Self-Diagnostic Function

Servo System Self-Diagnosis

Procedure for performing self-diagnosis on the servo system.

Mechanism Control Switches Self-Diagnosis

Schematic Diagrams

CD Servo Circuit Diagram

Schematic diagram for the CD servo control circuit.

Power Switch Circuit Diagram

Schematic diagram for the power switch control circuit.

Operation Circuit Diagram

Schematic diagram for the operation control circuit.

Loading Motor Circuit Diagram

Schematic diagram for the loading motor control circuit.

Main Circuit Diagram

Schematic diagram for the main control circuit.

Headphones Circuit Diagram

Schematic diagram for the headphone amplification circuit.

Printed Circuit Board (PCB) Layouts

CD Servo PCB Layout

Physical layout of the CD servo printed circuit board.

Power Switch PCB Layout

Physical layout of the power switch printed circuit board.

Loading Motor PCB Layout

Physical layout of the loading motor printed circuit board.

Operation PCB Layout

Physical layout of the operation printed circuit board.

Main PCB Layout

Physical layout of the main printed circuit board.

Wiring Connection Diagram

IC Terminal Functions

IC401 (UPD78042A014) Terminal Functions

Detailed pin functions for the UPD78042A014 IC.

IC Terminal Functions (Part 2)

IC701 (AN8805SBE1) Terminal Functions

Detailed pin functions for the AN8805SBE1 IC.

IC702 (MN662713RG1) Terminal Functions

Detailed pin functions for the MN662713RG1 IC.

IC Terminal Functions (Part 3)

IC702 (MN662713RG1) Terminal Functions (continued)

Detailed pin functions for the MN662713RG1 IC.

IC703 (AN8389SE1) Terminal Functions

Detailed pin functions for the AN8389SE1 IC.

Troubleshooting Guide

Block Diagram

Cabinet Parts Location

Loading Unit Parts Location

Packaging

Replacement Parts List

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