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Dual 704 Service Manual

Dual 704
22 pages
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Dual
Edition
October
1976
704
Service
-Manual
Dual
Gebrüder
Steldinger
7742
St.
GeorgenISchwarzwald
Download from www.dual.de
Not for commerical use

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Dual 704 Specifications

General IconGeneral
BrandDual
Model704
CategoryTurntable
LanguageEnglish

Summary

Specifications

Overall Speed Variation

Variation in overall speed as per DIN 45507.

Rumble and Noise Levels

Unweighted and weighted signal-to-noise ratios.

Tonearm Specifications

Effective tonearm length, tracking error, and bearing friction.

Tracking Force

Vertical tracking force adjustment range and method.

Pick-up Cartridge

Information on pick-up cartridge mounting and weight.

Dimensions and Cutout

Physical dimensions and cutout requirements for installation.

Circuit Diagram

Transistor Connections

Shows transistor connections from the side.

Voltage Measurement Points

Details voltages measured with respect to tensions.

DUAL EDS 900 Electronic Direct Drive System

System Description

Explains the slow-running, no-commutator DC motor system.

Speed Regulation

Describes how rotational speed is regulated.

Mounting Instructions for Dual EDS 900

Component Removal

Steps for removing motor electronics and power cable.

Motor Replacement

Procedure for replacing the motor unit.

Setting Nominal Speeds

How to set the nominal speeds for operation.

Stroboscope Adjustment

Pitch Control Adjustment

Tonearm Suspension and Friction

Bearing Friction

Vertical and horizontal bearing friction values.

Tracking Force Adjustment

How to adjust tracking force using the tonearm.

Assembly Removal

Steps to remove tonearm assembly and bearing frame.

Spring Housing Replacement

Procedure for replacing the spring housing.

Suspension Adjustment

Adjusting tonearm suspension for optimal performance.

Vertical Tonearm Control

Adjustment Points

Key points for adjusting vertical tonearm control.

Anti-skating Device

Adjustment

How to adjust the anti-skating force.

Tonearm Set-down Mechanism

Adjustment Points

Points for adjusting tonearm set-down.

Cue Control Operation

Cue Control Plate Replacement

Steps to replace the cue control plate.

Starting and Shut Off Procedures

Adjustment Points

Key adjustments for starting and shut-off functions.

Muting Switch

Adjustment Points

Adjusting contact springs for the muting switch.

Troubleshooting: Stylus Issues

Stylus Slips Out of Groove

Defect: Stylus slips out of playing groove.

Causes and Remedies for Stylus

Common causes and solutions for stylus issues.

Troubleshooting: Tonearm and Motor

Tonearm Lowering Issues

Defect: Tonearm lowers too quickly or doesn't set down.

Tracking and Anti-skating Problems

Defect: Tonearm moves with tracking/anti-skating at zero.

Motor Shut-off Failure

Defect: Motor does not switch off on tonearm rest.

Acoustic Feedback

Defect: Acoustic feedback issues.

Replacement Parts

Exploded View: Parts Above Plate

Diagram showing exploded view of parts above the turntable plate.

Exploded View: Parts Under Plate

Diagram showing exploded view of parts under the turntable plate.

Audio Connection Diagram

Lubrication Guide

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