Dual CS 728Q Manual Del Usuario página 11

Operation
Preparation
Turn the unit be depressing the POWER switch (21) Set the
speed selector knob (10) to either 33 1/3 or 45 RPM, whichever
corresponds to the prescribed speed ot the record to be played.
Pull up the stylus guard of the cartridge and release the tonearm
lock on the arm rest
Please note that records and stylus can be damaged by dust
accummulation. We therefore recommend to clean each record
before it is placed on the turntable with a silicon cloth, antista-
tic brush etc. Also remove dust from the stylus tip gently with
asoft brush.
1. Automatic Record Start
The automatic tonearm control system of the turntable is
designed for auto playback of 30 cm (12"') and 17 cm (7') LP
records (the only standard size records in production) and
coupled to the speed selector knob.
When a speed of 33-1/3 RPM is selected, the stylus will land
exactly in the lead-in groove of 30 cm records, at 45 RPM in
the lead-in groove of 17 cm records (Singles). The selected
speed is indicated by an illuminated display (17).
To start operation, depress the START pushbutton (15). The
turntable will start rotating while the tonearm is shifted from
the armrest to the record, lowering the stylus gently into the
lead-in groove
2. Manual Operation
a) Depress the LIFT pushbutton (13). Arrowmark 4 lights up.
b) Swing the tonearm over the desired position of the record
manually
c) Depress the LIFT pushbutton (13) once more. The w arrow-
mark lights up and the tonearm is lowered on the record.
3. Instant Repeat
To play a record from the beginning or once over again, just
depress the START pushbutton (15)
4, Pause Function
To interrupt record play, depress the LIFT pushbutton (13)
Operation resumes by depressing the LIFT pushbutton once
more. The stylus will be lowered to approximately the same
position on the record where it was lifted off and the last few
music beats played before the pause are repeated
5. Auto Cut
Depress the STOP pushbutton (14). The tonearm will return
automatically to the arm rest and the turntable drive is switched off.
6. Non-stop Operation
Depress the CO pushbutton (16). This will cause the tonearm,
to the lead-in groove again at the end of the record which is
then repeated over and over again, until either the STOP push
button (14) is being depressed or the CO pushbutton (16) is
released (OFF position)
Note: To play records of non:standard size, such as 25 cm LP
(10") discs or direct-cut records (e.g. 30 cm records to be
played with 45 RPM), your turntable must be operated ma
nually. See Part 2 "Manual Operation"
Regardless of operating mode (automatic or manual), the tone-
arm will return to the arm rest automatically at the end of the
record, Simultaneously the power will be cut off and the
platter stops rotating. We recommend to always lock the
tonearm to the arm rest and to swing down the stylus guard
when the turntable is not in use
Tonearm Lift
The functions of the tonearm lift supersede those of the auto
start function, In auto start mode, which means, after depres-
sing the START pushbutton (15) the arrowmark a lights up and
the tonearm will shift from the arm rest to a position exactly
above the record's lead-in groove. The tonearm will be lowered
on the record only after the LIFT pushbutton (13) has been
depressed, The tonearm's rate of descent can be continuously
adjusted by means of bushing (5). See Fig. 3
— =slower
+= faster
Stylus height, which means clearance between stylus tip and
record can be adjusted to approx. +6 mm by turning setscrew
(6) in raised position of the tonearm lift (arrowmark a illumi-
nated)
Pitch Control
Individual pitch control is provided for fine adjustment ofthe
two standard speeds 33-1/3 and 45 RPM by means of a special
PITCH adjuster (19).
After depressing the PITCH pushbutton (18) the QUARTZ in-
dicator goes off and the PITCH indicator lights up. With the
PITCH pushbutton in depressed position it is possible to vary
the pitch by adjustment of the PITCH contro! (19) in either
one of the two selected turntable platter speeds (33-1/3 or
45 RPM) by + 5.5%.
After releasing the PITCH pushbutton (18) the QUARTZ indi-
cator lights up again. Rotational speed of the turntable platter
will be quartz-controlled and corresponds exactly to the selected
nominal speed without regards to the adjustment of the PITCH
control (19).
Precise stroboscope patterns etched into the turntable platter
rim are illuminated by a special LED strobelight (20). See
Fig. 4. The sequence of light pulses corresponds to the quartz-
stabilized frequency which controls the motor speed. This indi-
cator functions independently of line frequency and does not
require several stroboscope patterns for different speeds and
line frequencies.
Tunable Acoustic Insulators
One of the most frequent problems in turntable operation are
vibrations of various origin, being picked up by the turntable
chassis and transferred to the cartridge, which converts these
vibration into interference signals.
To eliminate these problems, Dual's new generation of turn-
tables is equipped with tunable acoustic insulators. (Fig. 10)
Interference may be caused by
1. External vibrations. They occur when the turntable is placed
on a table or shelf in a room with wooden floor. External
vibrations, such as footsteps are transferred from the floor
to the furniture and from there to the turntable
2. Acoustic Feedback. A loud, howling noise will be encoun-
tered when sound waves radiated by the loudspeakers are
being picked up by the cartridge. Acoustic feedback is most
likely to occur when speakers and turntable are installed in
the same shelf
If you should encounter any problems caused by external
vibrations, rotate the dial ring of the acoustic insulator in
clockwise direction (+), in case of acoustic feedback turn the
dial ring in counterclockwise direction (—). Adjust the dial
rings of all four shock-absorbing feet by the same amount
This will provide optimum acoustic insulation
Alignment of the tonearm landing point
When the START button (15) is operated, the stylus automati
cally lowers itself into 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 lead-in groove, the landing
point of the diamond stylus can be corrected*with the align-
ment screw (8)
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
Cartridge and stylus
Please refer to the enclosed data sheet supplied separately with
your unit
Installing cartridges
Note: If you purchased your Dual turntable with a ULM
cartridge, it has already been installed and mounted in the
tonearm. If you wish to use an additional cartridge with
1/2-inch mounting center, an optional mounting kit is encluded
or available from your Dual dealer or United Audio.
Replacing the cartridge
You may release the complete cartridge from the tonearm by
pressing the tonearm lift (12) to the rear. When doingthis, firmly
grip the cartridge as it will fall off once the locking device has
been released (Fig. 8)
The tonearm lift may, however, only be moved to the rear if
you have previously removed the safety screw (11) (Fig. 11).
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