Origin Live Aurora Gold Platter Driven - Manual (Page 5)

Page 5
C O N N E C T T H E M O T O R D R I V E .
Plug in the black control box (switch box), transformer and
motor. The LED on the switch box will come on. This light
will remain lit all the time that the switch box is plugged in at
the mains supply.
Do not plug the transformer into mains conditioners,
filters or anything with surge protection - this is
disasterous to performance.
The location of the control box should preferably be
kept away from strong electromagnetic fields such as
those generated by transformers, amplifiers, power
supplies etc.
It is best to unplug the transformer if the switch box
is disconnected from it.
S E T T I N G T H E M O T O R S P E E D
NOTE:
You will need to set the motor speed yourself. In the first 4 hours of use
from starting up the motor, the speed tends to drift but then settles down
permanently. To burn in the regulator board components we recommend at
least 4 hours of running the motor before you accurately set the speed.
The thin output wires from the transformer only carry 8
volts and are therefore safe to handle. Voltages inside the
transformer are dangerous so the transformer case should not
be unscrewed or opened.
When the rotary switch on the control box is turned fully
anti-clockwise the motor is off.
One click of the switch clockwise is 33.3 rpm - The
second click clockwise is 45rpm
NOTE: The speed should only be finally set or checked with
the cartridge dragging on a centre track of a record as the drag
affects speed setting.
I N S T R U C T I O N S F O R R E A D I N G T H E
S T R O B E
Place the strobe disc on the record to be played. Play the record
and watch the relevant ring on the disc. Adjust the speed
until marks on the ring appear stationary while the record is
rotating. It sometimes helps to stare at infinity whilst doing
this as the marks become easier to see. You can see the strobe
effect in florescent light, although an ordinary bulb held about
2 feet from the strobe disc will also work fine. The bulb flickers
at 50 Hz in the EEC and 60 Hz in the USA.
You can purchase bayonet fitting florescent bulbs to fit normal
lamps. Try to shut out daylight when carrying out speed
setting.
S E T T H E S P E E D
Set the switch on the control box to the first click i.e. 33 rpm
setting. Adjust the motor speed as follows: using a small
flat blade screwdriver, turn the screw of P1 for 33 rpm.
The screws are accessible at the rear of the control box (See
diagram above). To increase speed, turn the 25 turn presets
clockwise until the speed changes. If the screw reaches the end
of it’s travel you can usually hear a faint clicking. You will not
damage the preset by over turning it as slippage occurs. The
pre-set screw will not fall out and may need a fair number of
turns to set the correct speed so keep turning.
Set P1 so that the platter turns at 33.3rpm. When setting the
speed, place the arm on the centre track of a record so that
the cartridge is tracking the grooves this ensures that the drag
of the cartridge is taken into account. Speed variations of up
to plus or minus 2% are quite common on decks and the dc
motor is capable of plus or minus 0.1% accuracy. Use the
strobe disc provided to set the speed (full instructions are on
the card).
However if you have problems using the strobe card,
then count the rpm using the following method. Counting
the 33.3 revs per minute is best accomplished by placing
a small piece of sticky tape on the perimeter of the platter
and then counting 100 revolutions. 33.3 rpm is exactly 100
revolutions completed in 3 minutes. To save time in the early
stages it is easiest to count 50 revs in 1 minute 30 seconds (or
25 revs in 45 seconds) and save the 100 count for the final
check.
Please note the following points when setting the speed.
Firstly all the figures below are based on setting the speed on
the deck using the centre track and letting the deck play for
a good 5 minutes beforehand with the stylus on the record
so that the whole system has settled down. The regulators
seem to take about 5 minutes to warm up,
so speed is about
2mins 58 seconds for 100 revolutions when the system starts
from cold. In other words it is 2/180 x 100 = 1 % fast when
started from cold.
Speed variation with the dc motor can vary
minutely depending on the track played and cut of record.
Click the rotary switch to the 2nd click clockwise and set P2 so
that the platter rotates at 45 or 78 rpm (if you wish) using the
same procedure as outlined above.
The dc motors are noisy to begin with and are never
completely silent in comparison to a/c motors. This is thought
to be due to a different type of precious metal brush. Having
said this they still sound a great deal better in performance
terms. To assist “running in” you can turn the speed right
up via the control box. The motor then runs at high speed.
Allow this for approx 4 hours after removing the belt. After
the running in period reset the motor speed. The motor