Nakamichi BX 125 Service Manual

Page 2

CONTENTS

3.

1.

Genenl ...................................................................... 1
Test Tapes and Gauges ............................................................ 2
Mechanical Adjustments .......................................................... 2

3.1. Tape Guide Height Check for Record/Playback Head and Erase Head ..................... 2

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

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

3. 4. Pressure Adjustment of Pressure Roller ......................................... 3

3. 5. Tape Travelling Check .................................................... 3

3. 6. Eject Damper Adjustment ................................................. 3

3. 7. Reel Motor Speed Adjustment in Play Mode ..................................... 3

3. 8. Tape Speed Adjustment ................................................... 3

3. 9. Lubrication ........................................................... 3
Parts Location for Electrical Adjustment ................................................ 4
Electrical Adjustments .................... . ....................................... 5

5. 1. Adjustment Instructions .................................................. 6

5.2. Playback Frequency Response Adjustment ...................................... 7
Mechanism Asa'y and Parts List ..................... . ................................ 8

6. 1. Synthesis ............................................................

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

6. 3. Mechanism Assy (301) ...................................................

6. 4. Rear Panel Assy (302) ...................................................
Mounting Diagrams and Parts List ....................................................

7. 1. Power Switch P.C.B. Ass'y .................

7. 2. LED P.C.l!. Ass'y ...................

7. 3. Timer Switch P.C.B. Asay ...... z . "

7. 4. Shut«off P.C.B. Assy .......... " .

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

7. 6. Volume P.C.B. Assy .....................................................

7. 7. Control Switch P.C.B. Assy ................................................

7. 8. Tape Switch P.C.B. Aasy ..................................................

7. 9. Indicator P. C. B Ass' y ....................................................

7.10. MainP.CB.Ass'y .......................................................
Schematic Diagram ............................................................... l9

8. 1. IC Block Diagrams ...................................................... 19

8. 2. Schematic Diagram ...................................................... 20
Wirinu Diagram ................................................................ 21
Block Diagrams ................................................................ 22
Timing Chart and Eq. Amp. Frequency Response .......................................... 24
Specifications ................................................................. 26
GENERAL

1.1. Volt-la Selector
Voltaae selector is installed on the rear panel for other version of the Nakamichi tax-126.
This voltage selector can select either 120 V or 220-240 V at customer: disposal.

1.2. Pectin: Materials and Owner- Manual

6
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Part No. Description Q

OFOSSBBA Carton Box lax-125 (silver)

0F03857A Canon Box 3X-125 (Black)

0F08856A Carton Box -125! (Silver)

OFOSIBSA Carton Box -1255: (Black)

017086740 Packini

0004617A Owner's Manual (Ensllah)

0D04618A Owners Manual (Enuish/Garman/French)
0D04522A Owner's Manual (Japanese)

MHHHHflHH

1.3. Serial Number
The BX-lZBIBx-125E has two veraions. Silver and Black.
In the service manual, aerial number-s of than versions are identified as follows:

silver version: Aszzxxxxx
Blackveraion: Aszaxxxxx

However. the actual serial number on the serial number plate of the Bx-le/BX-IZBB ll indicated ll A3213me-
The serial number Mains with 11321801001.