6
Power Supply
When the power supply is first switched on, the power L.E.D. in the power
switch will flash. 33 rpm is selected by pressing the 33 rpm button. Once
pressed 33 rpm is selected and the L.E.D will flash until the turntable has
settled. To deactivate 33 rpm press the button again or press 45 rpm. If 45
rpm is pressed then the L.E.D will flash again until the turntable has settled
at 45 rpm. To deactivate 45 rpm press the 45 rpm button again or 33 rpm.
When in the idle state the power L.E.D will flash. This is to show the power
supply is in standby mode and no output is present. The unit remains
powered up but in an idle state. i.e. the drive amplifier is disconnected
(muted) from the motor.
To switch off at any time, simply press the power switch.
The external power supply unit is a quart crystal locked system. To ensure
accurate speed stability of the platter motor, two quartz crystal control
reference oscillators have been utilised. This system produces a high
frequency (3 MHz for 33 and 4 MHz for 45) signal, which is then divided
Power Supply
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