Nakamichi lx 3 service manual

Page 2

CONTENTS

1. General ...................................................................... 3
2. Removal Procedures ............................................................. 5
2. 1. Top Cover Ass'y ........................................................ 5
2. 2. Bottom Cover Assy ..................................................... 5
2. 3. Cassette Case Cover Assy .................................................. 5
2. 4. Front Panel Ass'y .................................................... 5
2. 5. Mechanism Ass'y .................................................... 5
2. 6. Headphone Jack Ass'y ................................................. 5
2. 7. Logic 8: Power P.C.B. Ass'y ........................................... 5
2. 8. Dolby NR P.C.B. Ass'y .............................................. . . 5
2. 9. Main P.C.B. Ass'y and Amp. Switch P.C.B. Assy .................................. 5
2. 10. LED Level Indicator Ass'y, Control Switch P.C.B. Ass'y, Counter P.C.B. Ass'y and
LED P.C.B. Ass'y ....................................................... 7
2. 11. Rear Panel Ass'y ........................................................ 7
2. 12. Power Transformer ................................. 7
2. 13. Cassette Case Assy and Cover Plate Ass'y .................. 7
2. 14. Capstan Motor Assy and Flywheel Ass'y .................. . . 7
2. 15. Sub Mechanism Chassis Assy ............................................... 7
2. 16. Control Motor Ass'y and Reel Motor Assy ...................................... 7
2. 17. Cam Control Volume .................................................... 7
2. 18. Reel Hub Ass'y and Idler Assy .............................................. 8
2. 19. Cam Drive Gear and Control Cam 8
2. 20. Head Mount Base Assy ..................................... 9
2. 21. Erase Head, Pressure Roller and Tape Guide ....................... 9
2. 22. Record/Playback Head Ass'y ................................. 9
3. Meawrement Instruments . . 9
4. Mechanical Adjustments .......................................................... 1O
4. 1. Memanism Control Cam Adjustment .......................................... 10
4. 2 Reel Motor Speed Adjustment in Play Mode ..................................... 11
4. 3 Record/Playback Head Tilt Adjustment ........................................ 1 1
4. 4. Head Base Stroke Adjustment ............................................... 12
4. 5. Erase Head Stroke Adjustment and Tape Guide Height Check .......................... 12
4. 6 Erase Head Height and Tilt Adjustment ........................................ 13
4. 7 Back Tension Adjustment ................................................. 14
4. 8 Record/Playback Head Height Adjustment and Azimuth Alignment ...................... 14
4. 9. Tape Travelling Adjustment ................................................ 15
4. 10. Record Switch Linkage Adjustment ........................................... 15
4. 11. Flywheel Holder Adjustment ............................................... 16
4. 12. Tape Speed Adjustment ................................................... 16
4. 13. Lubrication ........................................................... 16
5. Parts Location for Electrical Adjustment .............................................. 17
6. Electrical Adjustments and Measurements ............................................. 18
6. 1. Adjustment and Measurement Instructions ...................................... 13
6. 2. Frequency Response Adjustment ............................................. 21
6. 3. Dolby NR Circuit Check .................................................. 22
7. Mounting Diagrams and Parts List .................................................... 23
7. 1. Power Switch P.C.B. Ass'y ................................................. 24
7. 2. Shut-off P.C.B. Ass'y ..................................................... 24
7. 3. LED P.C.B. Assy ...................................................... 24
7. 4. Control Switch P.C.B. Assy .............................................. 24
7. 5. COUnter-1 P.C.B. Assy ................................... 25
7. 6. Counter-2 P.C.B. Ass'y ..................................... 25
7. 7. Indicator P.C.B. Assy ....................................... 25
7. 8. Amp. Switch P.C.B. Ass'y ................................................. 26
7. 9. Dolby NR P.C.B. Ass'y ................................................... 27
7. 10. Logic & Power P.C.B. Ass'y ................................................ 35