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General| Drive System | Direct Drive |
|---|---|
| Wow and Flutter | 0.025% WRMS |
| Effective Arm Length | 221mm |
| Overhang | 15.5mm |
| Motor | Quartz PLL DC Servo Motor |
| Platter | Aluminum Die-Cast |
| Speeds | 33 and 45rpm |
| Tonearm Type | Static-balanced type |
| Cartridge Weight Range | 4 to 10g |
Illustrates the layout of components visible from the top of the turntable.
Shows the arrangement of components located on the underside of the turntable.
Detailed breakdown of the turntable's components, part one.
Detailed breakdown of the turntable's components, part two.
Detailed breakdown of the turntable's components, part three.
Presents the overall circuit diagram for the PL-550 turntable.
Detailed schematic and parts for the drive control circuit board.
Schematic and parts list for the turntable's power supply unit.
Schematic and parts for the positional detector assembly.
Provides a high-level overview of the turntable's operational components and their interactions.
Explains the construction and working principles of the DC motor.
Details how comparator outputs control motor direction and torque.
Describes the circuit responsible for switching motor drive currents based on signals.
Explains the circuit generating pulses for the stroboscope lamp.
Details the circuit preventing unwanted reverse rotation or 'run-away'.
Illustrates various signal waveforms generated within the drive control assembly.
Guides to diagnose and resolve issues where the motor fails to spin.
Provides steps to troubleshoot and fix excessive motor speed or uncontrolled acceleration.
Diagnoses issues causing the motor to switch rotation directions unpredictably.
Helps identify causes for inconsistent or fluctuating turntable speed.
Procedure for setting the operating point of the PA2001 integrated circuit.
Steps to calibrate the turntable's rotation speed using controls.
Circuit diagram for the HGT type, detailing its electronic components and connections.
Schematic and parts for the HGT model's power supply unit.
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