Aiwa NSX-S201, NSX-S202, NSX-S203 Service Manual
Introduction
This service manual provides comprehensive information for the Aiwa NSX-S201, NSX-S202, and NSX-S203 CD stereo systems. It includes specifications, revision publishing details, troubleshooting guidance, parts lists, and exploded views for servicing these models.
Specifications
The manual details specifications for the FM tuner, AM tuner, LW tuner, amplifier, cassette deck, and compact disc player sections. It also lists accessories and package contents.
- FM Tuner: Tuning range, usable sensitivity, antenna terminals.
- AM (MW) Tuner: Tuning range, usable sensitivity, antenna.
- LW Tuner: Tuning range, usable sensitivity, antenna.
- Amplifier: Power output, total harmonic distortion, inputs, outputs.
- Cassette Deck: Track format, frequency response, recording system, heads.
- Compact Disc Player: Laser, D-A converter, signal-to-noise ratio, harmonic distortion, wow and flutter.
- Speaker System (SX-NS202): Cabinet type, speakers, impedance, output sound pressure level, dimensions, weight.
- General: Power requirements, power consumption, dimensions of main unit, weight of main unit.
Safety Precautions
WARNING: Users must be cautious of invisible laser radiation when servicing. Avoid direct exposure to the laser beam. The CD player is classified as a CLASS 1 LASER product.
CAUTION: Use of controls or adjustments other than specified may result in hazardous radiation exposure.
Precaution to replace Optical Block: Be aware of electrostatic potential that could damage the laser diode. Ground body and workbench, and avoid touching the diode.
Repair Procedures
The manual outlines important notes before starting repair, including the forced discharge of electrolytic capacitors in the power supply block to prevent secondary defects. It also details checks to perform before exchanging the microcomputer, including verifying the HOLD terminal status and performing a forced reset procedure.
- Forced Discharge of Electrolytic Capacitor: Procedures for safely discharging capacitors using a discharging resistor.
- Microcomputer Checks: Verification of HOLD terminal status and forced reset procedure for the microcomputer.
- Soldering State Confirmation: Checking the soldering of the microcomputer to rule out poor soldering as the cause of issues.
Parts Lists and Diagrams
The document contains detailed electrical main parts lists, mechanical parts lists, tape mechanism parts lists, and exploded views of the mechanical components. It also includes wiring diagrams and block diagrams for various sections of the stereo system.
- Electrical Main Parts List: Comprehensive list of electronic components with part numbers and descriptions.
- Mechanical Parts List: Lists of mechanical components for the main unit and speakers.
- Tape Mechanism Parts List: Detailed parts for the tape deck mechanism.
- Exploded Views: Visual representations of component assembly for easier identification and replacement.
- Wiring Diagrams: Illustrate the electrical connections between different parts of the system.
- Block Diagrams: Provide an overview of the system's functional blocks and signal flow.
- IC Block Diagrams: Detailed diagrams for specific integrated circuits used in the system.
- FL Grid Assignment and Anode Connection: Information related to the front display panel.
Adjustment Procedures
The manual provides step-by-step instructions for various adjustments required for the tuner and deck sections to ensure optimal performance. These include:
- Tuner Section Adjustments: Clock frequency check, MW VT check, LW VT adjustment, FM VT check, MW tracking adjustment, LW tracking adjustment, FM tracking check, AM(MW) IF adjustment, and DC balance/mono distortion adjustment.
- Deck Section Adjustments: Auto stop level check, tape speed adjustment, head azimuth adjustment, PB frequency response check, PB sensitivity check, REC/PB frequency response check, and REC/PB sensitivity check.
