Dual 701 Service Manual

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Edition July 1973

Service Manual

Dual Gebrflder Steidinger -7742 St. GeorgenISchwarzwald

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Specification

Current Type

AC 50 - 60 Hz, without motor changeover
Line Voltages

110 -- 130 Volt, 220 - 240 Volt

Drive

Electronically-controlled direct drive system Dual EDS 1000

Power Consumption
approx. 2.6Watt
Motor during play < 50 mW

Current Consumption
with 220 V 50 Hz:
on start-up 60 mA
with 110 V 60 Hz:
on start-up 110 mA

during play 20 mA

during play app. 38 mA

Run-up Time (until nominal speed is reached)
2 - 2.5 sec. on 33 1/3 rpm

Platter

Non-magnetic, dynamically-balanced, detachable, 2.9 kg,
305 mm :1)

Total rotating mass of drive system (rotor with platter)
4.4 kg, moment of inertia 460 kp cm2

Platter Speeds
33 1/3 and 45 rpm, electronically switchable, automatic
tonearm lowering coupled to Speed change.

Pitch Control

Separate for both speeds, adjustable in each case with variable

resistor, with setting scales, range of adjustment 8 %.

Speed Check
with light stroboscope f0r platter speeds of 33 1/3 and 45
rpm, adjustable for 50 or 60 Hz

Sensitivity of Light Stroboscope for 0.1 96 Speed Deviation
6 graduations per minute at 50 Hz
7.2 graduations per minute at 60 Hz

Overall Speed Variation
(assessed in accordance with D IN 45 507)
< :t 0.03 %

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Signal-to-Noise Ratio ( in accordance with DIN 45 500)
Rumble unweighted signal-to-noise ratio > 50 dB
Rumble weighted signal-to-noise ratio > 70 dB

Tonearm

Torsion resistant, extra long tubular aluminium tonearm in
super flat universal four-point gimbal suspension, tonearm
balance weight with double acting vibration damping

(2 anti-resonators).

Effective Tonearm Length
222 mm

Offset Angle
25° 20'

Tangential Track Error Angle
0.160 / cm

Tonearm Bearing Friction
(related to stylus point)

Vertical < 0.007 p
Horizontal < 0.015 p

Tracking Force
0 - 3 p continuously variable, with 1/10 p calibration

ifn the range from 0 ~- 1.5 p, reliable as from 0.25 p tracking
orce

Pick-up Head

Detachable, suitable for all pick-up cartridges with 1/2
mounting and a deadweight of 2 - 10 9 (including moun-
ting material)

Adjustable Overhang
5 mm

Pick-up Cartridge
See separate data sheet

Weight
10.9 kg

Dimensions and Cutout Required
To be found in Installation instructions.

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Contents

Specification
Circuit Diagram
Dual EDS 1000 Electronic Direct Drive System
Description of Function
Spaleegfiaflon
Assembly instructions for Dual EDS 1000
Strobosoope
Glow lamp of stroboscope does not come on
Pitch control
Nominal speed is at the edge of the control range of the pitch control
Tonearm and Tonearm Suspension
Adjusting the Tonearm Bearing
Anti-skating Device
Horizontal movement of tonearm impeded on set-down
Stylus skips
Vertical tonearm movement shows resistance during set-down
Tonearm Control
Cue Control
Tonearm does not set down at the edge of record
Tonearm does not set down on record after Operating cue control
Tonearm lowers onto record too quickly when cue control is operated
Tonearm returns to rest after manual set-down immediately after the platter
starts to turn
Starting
Manual Start
Stopping
Short Circuiter
Shut-off
Tonearm moves with tracking force and anti-skating scale in 0-position
Disturbing noises perceptible during operation
No reproduction
Motor does not shut off when tonearm sets down on rest
Acoustic feedback
Platter remains stationary after automatic set-down of tonearm on record
Tonearm remains suspended just outside the 30 cm record when moved on or out
Tonearm does not move into position when control lever is operated
Lubricating Instructions
Spare Parts
Exploded Drawing - Parts Above Chassis
Explosed Drawing - Parts Below Chassis
Spare Parts
Spare Parts Motor electronic
Pick-up Connection Diagram

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Lubricating Instructions

All bearing and friction points of the unit are adequately
lubricated at the works. Replenishment of oil and grease is
only necessary after aproximately 2 years of normal use of
the record player as the most important bearing points (mo-
tor bearings) have sintered metal bushes.

F©.22

Bearing points and friction faces should be lubricated spa-
ringly rather than generously.

When using different lubricants, chemical decompositibn
can often take place. To prevent lubrication failure we re
commend using the original lubricants stated below. The
following lubricants should be used for subsequent lubri-
cation:

V Wacker Silicone Oil AK 300 000

A N V BP Super Viscostatic 10 W/30
WShell Alvania No.2

Spare parts
Ref. No. Part. No. Description Egig- Price group
1 229 068 Turntable mat complete with washer ............. 1 052
2 229 064 Turntable complete uiht mat .................... 1 078
3 210 516 Machine screw N 4 x 8 .. ................. . 3 012
4 228 558 Electronic direct drive system E05 1000 compl. . 1 Price of
strain reliefi
5 229 065 Case compl. ....................... . ............ 1 050
6 210 469 Machine screw N 3 x 3 .................... . ... 2 012
7 229 047 Case upper part compl. ................... . .. 1 029
8 227 165 DeFlecting prism ..... . ........................ . 1 024
9 225 321 Tubular glim lamp .............................. 1 030

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