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Dual 621 Service Manual

Dual 621
18 pages
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Dual
Edition
August
1978
621
Service
-
Manual
eutornetic
1
q
,
lECT
DRIVE
Dual
Gebrüder
Steidinger
7742
St.
GeorgenISchwarzwald
Download from www.dual.de
Not for commerical use

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Dual 621 Specifications

General IconGeneral
Drive SystemDirect Drive
Speed33 1/3 and 45 RPM
Effective Length222 mm
Platter Diameter300 mm
Platternon-magnetic
Automatic OperationFully automatic
Tracking Force1.5 g

Summary

Technical Data

Direct Drive System EDS 500

Motor System Repair and Replacement

Procedures for removing and replacing motor electronics and mechanics.

Pitch Control and Speed Setting

Pitch Control Operation and Adjustment

How to adjust nominal speeds, set 78 rpm, and use the pitch control.

Stroboscope Speed Verification

Using the stroboscope to accurately check platter speeds.

Tonearm System

Tonearm Overview and Removal Procedures

Details on tonearm suspension, friction, and steps for its removal.

Tonearm Adjustments and Replacements

Replacing spring housing and adjusting tonearm bearings.

Tonearm Control and Functions

Automatic Tonearm Operation Modes

Covers continuous play, automatic start, and manual start functions.

Stopping and Muting Mechanisms

Operation of stopping, shut-off, and muting switch functions.

Tonearm Set-down Point Adjustment

Adjusting the automatic set-down position of the tonearm.

Specific Adjustments and Troubleshooting

Lift, Power Switch, and Alignment Adjustments

Adjusting tonearm vertical lift, power switch, and tonearm head alignment.

Troubleshooting Common Defects

Diagnosing and fixing speed, stylus, tonearm, motor, and acoustic issues.

Component Specifications

Electronic Component Specifications

Specifications for various electronic components used in the turntable.

Lubrication Guide

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