The AIWA LX-50 is a stereo turntable system designed for high-quality audio playback with advanced features for ease of use and precise tracking. This service manual provides comprehensive details on its specifications, operation, and maintenance.
Function Description
The LX-50 is a fully automatic, direct-drive turntable system. Its primary function is to play vinyl records at two standard speeds: 33-1/3 and 45 rpm. A key feature is its linear tracking tone arm, which ensures the stylus maintains a tangent to the record groove, minimizing tracking error and distortion. This design contrasts with traditional pivoted tone arms, offering superior sound reproduction. The turntable incorporates a microcomputer-controlled system for automatic operation, including lead-in, lead-out, and repeat functions. It also features a "start/cut" button for manual control. The direct-drive motor system ensures stable platter rotation and excellent speed accuracy.
Important Technical Specifications
General:
- Power source: AC 120V/220V/240V switchable, 50/60 Hz, depending on the model (H, HB, E, EB, K, KB, G).
- Power consumption: 10W.
- Dimensions (W x H x D): 330(W) x 88(H) x 330(D) mm (13" x 3-1/2" x 13").
- Weight: 4.1 kg (9 lbs).
Turntable Section:
- Drive system: Frequency generated direct drive system.
- Motor: DC coreless 8-pole linear torque DD hall motor.
- Turntable platter: Aluminum alloy diecast.
- Speeds: 33-1/3 and 45 rpm.
- Wow & Flutter: 0.035% (WRMS).
- S/N Ratio: 70 dB (DIN-B).
Tone Arm Section:
- Type: Linear tracking type. Straight static balanced type.
- Effective arm length: 131 mm.
- Tracking error: ±0.1°.
- Arm elevation time: 1.2s/1.2s (DOWN/UP).
- Stylus pressure: 1.5 ± 0.3g.
- Dynamic compliance: 5x10⁻⁶ cm/dyne.
- Stylus tip: 0.6 mil. Diamond.
Cartridge Section:
- Type: VM type.
- Frequency response: 20-20,000 Hz.
- Output voltage: 2.5 mV (1 kHz 3.54 cm/s).
- Separation: More than 18 dB (33-1/3 rpm, at 1 kHz).
- Load impedance: 47 kΩ.
Usage Features
The LX-50 is designed for user-friendly operation with its automatic functions.
- Automatic Playback: Simply place a record on the platter, select the desired speed, and press "Start." The tone arm will automatically move to the lead-in groove and begin playback.
- Automatic Return and Shut-off: At the end of a record, the tone arm automatically returns to its rest position, and the turntable shuts off.
- Repeat Function: A dedicated "Repeat" button allows continuous playback of a record.
- Start/Cut Button: This button initiates playback or stops it and returns the tone arm to its rest position.
- Speed Selection: A switch allows users to select between 33-1/3 and 45 rpm.
- Linear Tracking: The linear tracking tone arm ensures optimal sound quality by maintaining a constant tangent to the record groove, reducing distortion and improving stereo separation.
- Voltage Selector: The power source is switchable between 120V, 220V, and 240V, making it adaptable to various regional power standards.
Maintenance Features
The service manual outlines several key maintenance procedures to ensure the longevity and optimal performance of the LX-50.
- General Precautions: Emphasizes the importance of using specified parts, ensuring proper lead-wire routing, and checking insulation resistance after repairs. It also warns against using non-specified parts, especially for safety-critical components.
- Stylus Height Adjustment: This procedure involves adjusting the stylus height using a jig and turning the turntable to ensure the stylus is parallel to the record surface. This is crucial for accurate tracking and minimizing record wear.
- Angle Sensor Adjustment: This adjustment is performed to ensure the linear motor operates correctly. It involves removing the belt, adjusting the sensor, and verifying voltage readings at specific test points. This ensures the tone arm moves smoothly and accurately across the record.
- Auto-in/Out Adjustment: This procedure calibrates the automatic lead-in and lead-out positions of the tone arm. It involves pressing specific buttons and adjusting the motor current to ensure the tone arm starts and stops at the correct positions on the record.
- Cleaning: The manual implicitly suggests regular cleaning of components, especially the stylus and platter, to maintain sound quality and prevent damage to records.
- Component Replacement: Detailed exploded views and parts lists are provided for easy identification and replacement of components, including the main circuit boards, motor, tone arm assembly, and various switches. Safety-critical components are marked with a "safety component symbol" to highlight the importance of using original or approved replacements.
- Wiring Diagrams: Comprehensive wiring diagrams are included to assist technicians in troubleshooting and repairing electrical connections.
- Voltage Measurement: Notes on voltage measurement specify that values are measured with a tester (20 K ohms/V DC) when there are no signals, and with a vacuum-tube voltmeter during recording, indicating the precision required for diagnostics.
Overall, the AIWA LX-50 is a sophisticated turntable system designed for both performance and reliability, with detailed service information to support its maintenance.
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