DENON DP-1000

Commentary

While inheriting the design image of the DP 3000, the appearance was made compact, and each part was simplified and the cost was reduced while maintaining the basic performance.

A direct drive system is adopted as the drive system.
Unlike the belt drive and idler drive systems, the direct drive system does not have a rotational flutter mechanism, so there is no wow transmission or rumble caused by these systems. In addition, the direct drive system can maintain stable performance over a long period of time because there is little wear.

The servo circuit uses a speed detection mechanism based on a magnetic recording / reproducing method developed by DENON's station player.
In this system, 1000 pulse signals are recorded with a high accuracy of less than 0.01% recording wavelength error using a special method on a magnetic material coated on the inner circumference of the rim of the turntable. These signals are then detected by a magnetic head in close proximity to the magnetic material. A demodulation circuit converts the voltage into a voltage proportional to the rotational speed of the turntable. This voltage is compared with a reference voltage corresponding to the specified speed. The difference voltage is used to control the torque of the motor so that the difference voltage becomes 0, and the turntable is kept at the specified speed by servoing.
In addition to the high accuracy of the speed detection signal, the frequency is higher than that of other methods (500 Hz or higher), so it is stable even when the gain of the servo system is increased, and the response is fast and stable servo can be applied even in the region of uneven rotation.

For the drive motor, the solid rotor type AC servo developed for direct drive also uses Oter.
This motor is the same as that installed in the DP-3000. It has smooth rotation characteristics with less vibration compared to other synchronous motors and DC motors. Moreover, the driving waveform of the motor is also taken into consideration. There is almost no rumble, and the S / N ratio is over 60 dB.

The switch adopts a slide system using a cam.
The rotational speed can be changed by changing the circuit constant with a switch. This speed selection switch is linked with the power switch and allows you to select the speed and turn the power ON/OFF with one touch operation.
The switch uses special high-grade grease used in cameras.

Equipped with easy-to-understand built-in flash and flash shutter.

Model Rating

Type	Turntable
Drive system	Servo-operated direct drive
Motor	Solid rotor type AC torque motor
Speed control	Voltage servo by frequency detection
Number of revolutions	33 1/3, 45 rpm
Speed switching mechanism	Slide switch switching (electrical switching)
Startup time	1.8 Seconds or Less (1/2 Rotation, 33 1/3rpm)
Wow and flutter	0.03% wrms or less (according to test records)
Motorboard	Aluminum die cast
Signal-to-noise ratio	60 dB or more
Turntable	30 cm aluminum die-cast, 1.1 kg
Moment of inertia	160 kg / cm2
Rotational speed adjustment range	+ / - 3%
Pwer	100 VAC, 50Hz/60Hz
Power consumption	11W
External dimensions	Width 356x Height 132x Depth 356 mm
Weight	6.8kg