Teac VRDS-25 Service Manual

VRDS-25
TEAC
SERVICE MANUAL
Compact Disc Player
COMPACT
DIGITAL AUDIO
CONTENTS AR
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Effective : December, 1995

Teac VRDS-25 Specifications

General

Disc Type	CD
Frequency Response	2Hz-20kHz
Dynamic Range	98 dB
CD Mechanism	VRDS (Vibration-Free Rigid Disc Clamping System)
Channel Separation	110dB
Line Output	2.0V RMS
Digital Outputs	Coaxial, Optical
Digital to Analog Converter	20-bit

Summary

1 SAFETY INFORMATION

General Laser Safety Precautions

Warnings and cautions regarding hazardous laser radiation exposure and handling.

3 ADJUSTMENT AND CHECKS

Pickup Assembly Replacement

Procedures and precautions for replacing the laser pickup assembly.

Voltage Conversion Procedure

Procedure for changing the voltage selector switch.

3-1 SERVO ADJUSTMENT

Clock Frequency Adjustment

Steps to adjust the clock frequency using a frequency counter.

Sled Balance Adjustment

Procedure to adjust sled balance using a DC voltmeter.

3-2 AUDIO ADJUSTMENT

Audio Output Adjustments

Procedures for adjusting distortion and DC offset of audio output.

Audio Output Level and Performance Checks

Checking audio output level, frequency response, S/N, and channel separation.

5 PC BOARDS AND PARTS LIST

Digital Out PCB Assembly

Sensor PCB Assembly

Key PCB Assembly

Servo PCB Assembly

Diagram and parts list for the Servo PCB.

Control and Power Supply PCBs

Signal Processing and Servo PCBs

Diagrams and parts lists for Audio and Power Servo PCBs.

Audio PCB Component Details

Voltage Selector PCB Assembly