Pitch Control; Replacing The Drive Belt; Technical Data - Dual Cs 1256 Instructions De Fonctionnement

Pitch control
Each of the two standard speeds (33 1/3 and 45 rpm) can be
varied with the pitch control. Adjustment is made with pitch
control knob (14) (Fig. 3). Adjustment range at 33 1/3 rpm
approx. 1 semitone (6 %).
The pitch control maintains the nominal speed and provides
for individual control of tempi and pitch of reproduction, for
example, when the pitch of recorded music is to match a live
musical instrument, or when a record passage is to match the
length of a motion picture scene.
The selected turntable speed can be checked with the aid of
the stroboscope on the outer edge of the turntable. If this is
illuminated with a light operating on alternating current, then
the scale of circular dots for the required turntable speed ap-
pears to stand still — although the turntable is moving - if the
speed of the turntable is accurately adjusted.
Removing the platter
The platter is secured by the connection of the central ornamen-
tal ring. To remove the platter press the ring slightly downward
and turn it approximately 609 to the right until it noticeably
releases. The platter can now be removed.
To secure the platter replace the ornamental disc press it down
slightly and turn it approximately 609 to the left.
Replacing the drive belt
In order to replace the drive belt, the platter must be removed
(see section "removing the platter").
Remove the flat belt from the drive pulley and platter pulley
and place the new precision flat belt on the belt surface of the
platter pulley.
Important! The matt (polished) side must face inwards!
Lift the flat belt (if necessary with a strip of cardboard) from
the pulley surface and place it over the drive pulley of the
motor. Make sure that the flat belt runs within the guide fork
without touching.
Adjustment of Tonearm indexing
If playing of a record is started automatically, the pickup
needle is lowered automatically into the run-in groove of the
record.
If the stylus of another cartridge, installed later, sets down too
far inside or outside the lead-in groove, adjustment can be
made as follow:
Move the speed selector to "33", Removing the decorating
strip (first lift it on the rear edge) will expose the control (8)
for tonearm indexing (Fig. 4).
Place a 1277 record on the platter and start the unit. If the sty-
lus sets down too far inside or outside the center of the record,
turn adjusting screw clockwise or counterclockwise, respectively.
Turn the adjusting screw clockwise or anticlockwise until the
pickup needle is lowered accurately into the starter groove.
50 or 60 Hz Line Frequency
Conversion to a different power line frequency ia accomplished
by exchanging the motor drive pulley.
60 Hz AC current is generally supplied in overseas countries.
Ask your dealer, if necessary.
Service
All lubrication points are adequately supplied with oil prior to
delivery to the customer. Under normal conditions, your Dual
unit should function properly for many years; do not oil any
part of your Dual turntable yourself. Should your player ever
require service, please take it to your Dual dealer, or ask him
for the address of the nearest authorized Dual service station.
Please make sure that only original Dual replacement parts are
used. Should shipping of your Dual become necessary, make
sure the packing is adequate. Use, if possible, the original
packing material in which you received your Dual.
Technical data
Measured values = typical values.
Rumble and wow and flutter values obtained with test record.
Current
AC 50 or 60 Hz,
can be converted by replacing the drive pulley and the electronic
system of the motor.
Line Voltages
115 and 230 V, changeable
Drive
Dual 16-pole synchronous motor: precision flat belt for flywheel
drive
Power consumption
approx. 8 watts
Platter
aluminium section platter 270 mm $, 0.9 kg
Platter speeds 33 1/3 and 45 rpm
Automatic tonearm set-down coupled with speed adjustment
Pitch Control Variation
at both platter speeds.
Adjustment range at 33 1/3 rpm approx. 1 semitone (6 %).
Total Wow and Flutter
According to DIN 45 507 (German Industry Standard) + 0.08%
WRMS 10.05%
Rumble (according to DIN 45 507)
Unweighted 46 dB
Weighted 68 dB
Tonearm
Torsion-resistant tubular aluminum tonearm in fourpoint gimbal
Tonearm bearing friction
(Referred stylus tip)
Vertical 0,08 mN (0,008 g)
Effective tonearm mass 65 mN (6,5 g)
Stylus Pressure
from O - 30 mN (0 -3 g) infinitely variable, operable from 10 mN
(1 g) stylus pressure up
Cartridges with 1/2 inch screw-type attachment. These can be
fitted with the special accessories no. 261 865 which can be ob-
teined from trade dealers. Adjustable Overhang 5 mm.
Cartridge
See separate data sheet
Uitpakken en opstellen
Na openen van de doos verwijdert U eerst de styroporverpak-
king met het plateau. Nu kan de console met de daarin ge-
plaatste grammofoon uit de doos worden genomen en op de
daartoe bestemde plaats worden gezet.
Verwijder de met een rood label gemerkte beveiligingsschroef
van de platenspeler en draai de transportschroeven (Fig. 1)
kloksgewijs los tot ze ca. 15 mm naar beneden vallen.
En draai en transportschroeven vast door ze kloksgewijs verder
te draaien (B)
A B
Nu plaatst u het plateau op de motor. In destyropor verpakking
vindt U het contragewicht (1) (Fig. 2).
Draait u deze aan de achterzijde op de toonarm. Het uitbalan-
ceren, evenals het noodzakelijke instellen van de naaldkracht
en antiskatingkracht worden laten uitvoerig beschreven.
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