Nakamichi BX 300 Service Manual

Page 2

CONTENTS

1.
2.
3.

10.

12.

General ...................................................................... 2
Test Tapes and Gauges ............................................................ 2
Mechanical Adjustment ........................................................... 3
3, 1 Record Head and Playback Head Tilt Adjustment ................................. 3
3. 2 Head Base Stroke Check .................................................. 3
3. 3 Erase Head Stroke Adjustment and Tape Guide Height Check .......................... 3
3. 4 Erase Head Height and Tilt Adjustment ........................................ 4
3. 5 Playback Head and Record Head Height Adjustment and Azimuth Alignment ............... 4
3. 6 Pressure Adjustment of Take-up Pressure Roller ................................... 5
3. 7 Tape Travelling Check .................................................... 5
3. 8 Eject Damper Adjustment ................................................. 5
3. 9. Reel Motor Speed Adjustment in Play Mode ..................................... 5
3 10. Tape Speed Adjustment ................................................... 5
3 11 Lubrication ........................................................... 5
Parts Location for Electrical Adjustment ................................................ 6
Electrical Adjustments ............................................................ 7
5. 1. Adjustment Instructions .................................................. 7
5. 2. Playback Frequency Response .............................................. 9
Mechanism Assy and Parts List ...................................................... 10
6. 1. Synthesis ............................................................ 10
6. 2 Front Panel Assy (A01) .................................................. 11
6. 3 Synthesis Mechanism Assy (A02) ............................................ 11
6. 4 Front Chassis Ass'y (301) ................................................. 12
6. 5 Cover Plate Assy (B02) ................................................... 13
6. 6 Mechanism Ass y (1303) ................................................... 14
6. 7. Rear Panel Assy (304) ................................................... 15
Mounting Diagrams and Parts List .................................................... 15
7. 1. Power Switch P. C. B. Ass y ................................................. 15
7. 2. Shut-off P.C.B. Assy ..................................................... 15
7. 3. Fuse P.C.B. Assy ....................................................... 16
7. 4. Volume P.C.B. Assy ..................................................... 16
7. 5. Input Amp. P.C.B. Assy .................................................. 17
7. 6. Meter Amp. P.C.B. Assy .................................................. 17
7. 7. Dolby NR Switch P.C.B. Assy .............................................. 17
7. 8. Control Switch P.C.B. Assy ................................................ 18
7 . 9. Counter P.C.B. Assy ..................................................... 18
7. 10. Tape Switch P. C. B. Assy .................................................. 18
7. 11. MaianCB Assy ....................................................... 19
Schematic Diagrams ............................................................. 23
B. 1. IC Block Diagrams ...................................................... 23
8. 2. Schematic Diagrams ..................................................... 24
Timing Chart and Eq. Amp. Frequency Response .......................................... 26
9. 1. Timing Chart .......................................................... 26
9. 2. Eq. Amp. Frequency Response .............................................. 26
Wiring Diagram ................................................................ 27
Block Diagrams ................................................................ 28
11. 1. Amplifier Section . . 28

11. 2. Mechanism Control Section ................................................ 29
Specifications ................................................................. 30