Dual 522 Service Manual

Service
Manual
Technical data
Current
Line Voltage
Drive
Power
consumption
Starting Time
Power Consumption
Platter
Platter speeds
Pitch Control Variation
Speed
control monitoring
Sensitivity of the strobe for 0.1 %
speed deviation
Total VVow and Flutter
Rumble
(according to DIN
45
500)
Tonearm
Effective Length of Tonearm
Offset Angle
Tangential Tracking Error
Tonearm Bearing Friction
(related to stylus tip)
Stylus Pressure
Cartridges
VVeight
Measured values =
typical values.
Rumble and wow and flutter values obtained with test record.
AC 50 or 60 Hz, changeable by changing motor
pulley
115 or 230 V,
changeable
Dual 16 -pole synchronous motor: flat belt for flywheel drive
approx. 8
watts
(to each
nominal speed) approx. 2 seconds at 33 1/3 rpm
at 220
V, 50 Hz:
approx. 75 mA
at 117 V, 60
Hz: approx. 140 mA
Non-magnetic, detachable, 1 kg,
304 mm 0
33
1/3 and 45
rpm
at
both platter
speeds
Adjustment range at 33 1/3 rpm approx. 1 semitone
(6%)
with
stroboscope for platter
speeds 33 1/3 and
45 rpm,
adjustable to 50 or 60
Hz.
6 division markings
per minute at 50 Hz,
7.2
division markings per minute at 60 Hz.
DIN
± 0.07 %
WRMS
±
0.04
%
Unweighted 48 dB
Weighted
70 dB
Torsion-resistant
tubular aluminium tonearm in
four-point gimbal bearing
221 mm
24° 4'
0.16
0 /cm
vertical 0.07 mN
(0.007
g)
horizontal 0.15 mN (0.0159)
from 0 — 30 mN (0 —3 g) infinitely variable with 1 mN (1/109) calibrations
from 0 — 15
mN (0 — 1.5 g)
operable from 5
mN (0.59) stylus pressure up
with 1/2 inch
screw-type attachment. These can be fitted with the special
accessories
no. 262 186 which can
be obtained from trade
dealers.
4.1 kg
Dual
522
Edition
January
1980
•
Download from www.dual.de
Not for commerical use

Dual 522 Specifications

General

Drive System	Belt drive
Speeds	33 1/3, 45 RPM
Tonearm	Static balanced S-shaped tonearm
Cartridge	Ortofon ULM 60E
Platter	Aluminum die-cast
Wow and Flutter	0.1%
Rumble	-50dB
Drive type	Belt

Summary

Motor and Drive

Speed Selection

Adjusting turntable speed via belt and pulley selection.

Platter

Securing mechanism of the platter to the securing disc.

Belt Replacement

Instructions for replacing the drive belt.

Motor Pulley Replacement

Step-by-step guide for replacing the motor pulley.

Stroboscope and Pitch Control

Stroboscope Usage

Using the stroboscope to check turntable speed accuracy.

Pitch Control Adjustment

Feature for adjusting turntable speed tuning range.

Tone Arm Bearings

Tone Arm Bearing Details

Details on the tonearm's universal gimbal bearing and friction.

Removing the Tonearm Assembly

Procedure for removing the tonearm assembly.

Additional Tone Arm Information

Removing Tonearm Housing

Steps to remove the tonearm or spring housing.

Adjusting Tone Arm Bearings

Procedure for balancing and adjusting tone arm bearings.

Cartridge and Anti-Skating Setup

Fitting cartridges and adjusting anti-skating force.

Tone Arm Lift and Control

Operation and adjustment of the tonearm lift and control mechanisms.

Turntable Operation Modes

Starting Sequence

Steps involved when initiating turntable operation.

Manual and Continuous Play

How to manually start and operate in continuous play mode.

Muting Switch and Shut-off

Function of the muting switch and final auto shut-off.

Stop Circuit Operation

Stop Circuit Mechanism

Mechanism controlling the stop and shut-off functions.

Tone Arm Adjustments

Set-down and Shut-off Points

Adjusting tonearm set-down and auto shut-off points.

Tone Arm Lift Height Adjustment

Adjusting the height of the tonearm lift mechanism.

Troubleshooting Guide

Tone Arm Lowering & Acoustic Feedback

Addresses tone arm lowering issues and acoustic feedback.

Speed and Starting Problems

Troubleshooting issues with speed and the turntable not starting.

Lubrication

Lubrication Points

Details on where and how to lubricate unit bearing points.

Recommended Lubricants

List of original lubricants recommended for the unit.