Nakamichi BX 1 Service Manual

Page 2

CONTENTS

1. General... ........... . ....................... ...........................
2. MechanicalAdjustments.... ....................................
2. 1. Tape Guide Height Check for Record/Playback Head and Erase Head .............. . ......

2. 2. Head Base Stroke Check ..................................................

2. 3. Record/Playback Azimuth Alignment and Height Check .............................

2. 4. Pressure Adjustment of Pressure Roller ........................ . ............. . . .

2. 5. Tape Travelling Check . . . ........................... . ......... . ...........

2. 6. Eject Damper Adjustment . . . ..............................................

2. 7. Reel Motor Speed Adjustment in Play Mode .....................................

2. 8. Tape Speed Adjustment ............................................... , . . .

2. 9. Lubrication ......................................... . . ................

3. Parts Location for Electrical Adjustment .............................................. . . .
4. Electrical Adjustments and Measurements ...............................................
4. 1. Adjustment and Measurement Instructions ......................................

4. 2. Dolby NR Circuit Check ..................................................

5. Mechanism Assy and Parts List .................................................. . . . .
5. 1. Synthesis ............................................................

5. 2. Synthesis Mechanism Assy (A01) ............................................

5. 3. Mechanism Assy (BOI) .................................................. .

6. Mounting Diagrams and Parts List ....................................................
6. 1. Power Switch P.C.B. Assy .................................................

6. 2. Pin Jack P.C.B. Assy .................... . ................. . ..............

6. 3. Volume P.C.B. Assy .....................................................

6. 4. Dolby NR Switch P.C.B. Assy ..............................................

6. 5. MPX P.C.B. Assy .......................................................

6. 6. Timer Switch P.C.B. Assy .............. . ....................... . ..........

6. 7. Memory Switch P.C.B. Assy ................................................

6. 8. Control Switch P.C.B. Assy ................................................

6. 9. Shut-offP. C B. Assy ........................................... . .........
6.10. Main P .C. B. Assy .......................................................

7. Schematic Diagram ..............................................................
7. 1. Schematic Diagram ......................................................

'7. 2. Attention to Servicemen ..................................................

7. 3, 10 Block Diagrams ......................................................

8. Wiring Diagram ....................................................... . ...... . .
9. Timing Chart and Eq. Amp. Frequency Response ...................................... . . . .
10. BlockDiagrams ....... . ...................... .......................

11. Specifications ............................................. . . . . . . . . ..... . . . . . .

1 . GENERAL

1.1. Voltaxe Selector
Voltaire selector is installed on the rear panel for Other version of the Nakamichi BX-l.

This voltage selector can select either 120 V or 220-240 V at customers disposal.

1.2. Parts List for Carton and Packing

Part 3:10 Description 9.3".
0F036810 Carton 1
0F0367 4A Packing 2

1.8. Serial Number
The BX-l has two versions. Silver and Black.
In the service manual. serial numbers of these versions are identified as follows:
Silver Version: A314xxxxx
Black Version: Aalfixxxxx
However. the acme! serial number on the serial number plate of the BX-l is indicated as A314.5xxxxx.
The serial number belins with A314.501001.

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