Dual CS 714 Q User Manual

Switch-off of Set-down Aid
This HiFi turntable is fitted with a set down aid enabling you
to find the correct position of lead-in grooves for either 17 cm
or 30 cm records.
When the tonearm is moved slowly inside a stop location is
palpable at each 17 cm or 30 cm diameter, indicating the exact
set-down point for the diamond for the lead-in groove of these
records.
To choose any other portion of the record, the set-down aid
may be switched off.
Turning knob (7) in v position
Stop location for set down point in lead-in grooves switched on
Turning knob (7) in — position
Stop location switched off.
Alignment of the tonearm setting down point
When the set-down aid is switched on (knob (7) in position V)
diamond will place itself into the correct position of the lead-
in groove of the record. If, in the case of a subsequently fitted
cartridge for example, the stylus sets down too far from the
run-in groove, the setting down point of the diamond stylus
can be corrected with the alignment screw (11).
If the stylus sets down too far inside or outside the record,
turn the alignment screw to the left or the right accordingly.
The setting is effective not only for 17 cm but also for 30 cm
records.
The platter
The dynamically balanced aluminum diecast platter lies direct-
ly on the motor axis and, when placed in position, is automati-
cally fixed through its own weight. Additional locking is not
necessary and is also not provided for.
Important! Remove the platter before transporting the unit!
Quartz controlled direct drive EDS 920
The newly developed quartz controlled direct drive of this
Dual HiFi record player is a synthesis of the wellknown Dual
direct drive motor principle and a highly sensitive electronic
system which receives its exactness from a quartz crystal. The
drive motor is a no-collector DC motor, in the case of which
the mechanical-electrical switchover (commutation) is carried
out by two Hall generators, which recognize the respective po-
sition of the rötor equipped with an 8-pole annular magnet
and which activate the respective winding strands of the static
flat coils. The magnetic return plate which also rotates and the
annular magnet surround the air-core coil arrangement with a
slight air gap so that the drive on the one hand obtains an ex-
tremely steady running behavior without any pole sensitivity
and on the other hand it obtains a powerful starting torque
despite the thrifty supply of energy.
Af ter the rated speed has been attained, this motor needs less
than 50 mW in order to maintain rotation of the record player.
At the same time, this extremely low power consumption is
proof of the highly precise design of this drive principle and,
on the other hand, ensures that this HiFi record player is prac-
tically absolutely free from rumble.
For determination of the effective speed, the motor is coupled
with a multipole generator which supplies a frequency propor-
tional to the speed with great resolution. At the same time, a
highly stable frequency is produced from the quartz oscillator
via a divider circuit, which corresponds exactly to the generator
frequency at rated speed. Both frequencies are applied toaPLL
switching circuit and are compared there with each other. Even
if the record player is subjected to an additional load, for
example a record cleaner, the platter speed remains absolutely
constant due to this phase-locked coupling of the control
electronics.
Service
All the lubrication points have sufficient oil. Thus, your unit
will operate impeccably for many years under normal condi-
tions. Never try to lubricate any of the lubrication points your-
self. If your record player should ever need servicing, either
take it to your specialist dealer or ask him for the address of
the next authorized Dual Servicing Workshop. Please make
sure that only original Dual replacement parts are used.
Should the unit ever be dispatched, make sure that this is packed
perfectly, if possible, by using the original packaging.
Electrical safety
The unit complies with the International Safety Regulations
for radio and related devices (IEC 65).
Technical data
Measured values = typical values.
Rumble and wow and fl utter values obtained with test record.
Current type Alternating current 50 or 60 Hz
Mains voltages 110 - 125 V and 220 - 240 V
Drive
Quartz stabilized electronic direct drive system Dual EDS 920,
PLL control
Power consumption
Approximately 4 W, motor during playing < 50 mW
Starting time
(Until the rated speed is attained) approximately 1.8 seconds
at 33 rpm
Platter
Non-magnetic, dynamically balanced, removable, total rotating
m
ass approximately 1.5 kg
Platter speeds
33 and 45 rpm, switched över electronically, quartz stabilized.
PLL technology, separate quartz-exact adjustment for both
speeds, adjustment range ± 5.5 %
Speed control
Quartz-exact, luminous stroboscope with automatic frequency
switchover for 33 and 45 rpm
Sensitivity of the luminous stroboscope for 0.3 % speed deviation
20 division marks per minute
Wow and f lutter
DIN ±0.025%
WRMS ±0.015%
Signal-to-noise ratio (in accordance with DIN 45 500)
Rumble unweighted signal-to-noise ratio 55 dB
Rumble weighted signal-to-noise ratio 78 dB
Tonearm
Distortion-free "ultra-low-mass", aluminum tubular tonearm
in gimbal 4 point tip bearing.
Tonearm counterbalance with tuning anti-resonator
Effective tonearm length 221 mm
Offset angle 240 4'
Tangential tracking error 0.16° /cm
Tonearm bearing friction
(Referred stylus tip)
Vertical 0.07 mN (0.007 p)
Stylus pressure
Infinitely variable from 0 to 20 mN (0 - 2 g), with 1 mN (0.1 g)
calibration in the range from 2 to 15 mN (0.2 -1.5 g)
Cartridge holder
Removable, optimally adapted to ultra-low-mass cartridges,
with long holder plate (in the accessories) also suitable for
cartridges with Dual recess-type cartridge asscmbly and for
cartridges with 112" attachment and an own weight of 2 to 9 g
(including attachment material)
Adjustable overhang: 5 mm
Cartridge See separate data sheet
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Dual CS 714 Q Specifications

General

Brand	Dual
Model	CS 714 Q
Category	Turntable
Language	English