Nakamichi MB-4s Service Manual

ERVICE MANUAL
MB-4s
MusicBank
CD
Player
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Nakamichi MB-4s Specifications

General

Brand	Nakamichi
Model	MB-4s
Category	CD Player
Language	English

Summary

1. GENERAL

1.1. Product Code

Specifies the product code assigned to the unit.

1.2. Destinations

Lists the regions or countries for which the product is intended.

1.3. Cautions and Warnings

Safety notices regarding product operation, leakage current, and laser beam exposure.

1.4. Voltage Selectors

1.5. Handling the Laser Pickup

1.5.1. Grounding Procedures

Instructions for grounding human body and equipment during laser pickup servicing.

1.5.2. Static Discharge

Guidelines for discharging static electricity before handling sensitive components.

1.5.3. Soldering Iron Requirements

Specifications for soldering irons suitable for laser pickup repair.

1.6. Stocker Operation Check Function

1.7. Package and Accessory Assembly

2. MECHANICAL ADJUSTMENTS

2.1. Gear Positioning in Side Chassis R Section

Procedures for aligning and positioning gears within the side chassis R section.

2.2. Tray Ass'y Positioning

Steps for correctly positioning the tray assembly on the mechanism unit.

2.3. Lubrication

3. MEASUREMENT INSTRUMENTS AND JIGS

4. PARTS LOCATION FOR ELECTRICAL ADJUSTMENT

5. ELECTRICAL ADJUSTMENTS

5.1. Test Unit Connection

Instructions for connecting the test unit to the Main P.C.B. for adjustments.

5.2. Laser Current Check

Procedure to check and adjust laser current, measuring current flow into R101.

5.3. VCO Frequency Adjustment

Steps to adjust the VCO frequency using VR105 and a frequency counter.

5.4. EFM Signal Adjustment

Procedure to adjust VR101 for optimal waveform amplitude and clarity.

5.5. E-F Balance Adjustment

Steps to adjust VR102 for proper E-F balance waveform center level.

5.6. Tracking Gain Adjustment

Procedure to adjust VR104 to equalize waveform amplitudes for tracking gain.

5.7. Focus Gain Adjustment

Steps to adjust VR103 to equalize waveform amplitudes for focus gain.

5.8. Operation Check

Performing functional tests using specific test disc programs to ensure proper operation.

6. MECHANISM ASS'Y AND PARTS LIST

6.1. Synthesis

Overall schematic and parts list for the mechanism assembly.

6.2. Front Panel Ass'y (A01)

Exploded view and parts list for the front panel assembly.

6.3. Mechanism Ass'y (A02)

Exploded view and parts list for the main mechanism assembly.

6.4. Side Chassis R Section (B01)

Exploded view and parts list for the right side chassis section.

6.5. Main Chassis Section (B02)

Exploded view and parts list for the main chassis section.

6.6. Drive Unit Section (B03)

Exploded view and parts list for the drive unit section.

7. MOUNTING DIAGRAMS AND PARTS LIST

7.1. Main P.C.B. Ass'y

Mounting diagram and detailed parts list for the main printed circuit board assembly.

7.2. Transformer P.C.B. Ass'y

Diagram and parts list for the transformer printed circuit board assembly.

7.3. Power Switch P.C.B. Ass'y

Diagram and parts list for the power switch printed circuit board assembly.

7.4. Key P.C.B. Ass'y

Diagram and parts list for the key input printed circuit board assembly.

7.5. Display P.C.B. Ass'y

Diagram and parts list for the display printed circuit board assembly.

8. IC BLOCK DIAGRAMS

9. BLOCK DIAGRAM

10. WIRING DIAGRAMS

SPECIFICATIONS

Main Unit Specifications

Technical specifications for the main CD player unit.

Remote Control Unit Specifications

Technical specifications for the infrared remote control unit.

Supplied Accessories

List of accessories included with the CD player unit.