Nakamichi CR 20 Service Manual

Page 2

CONTENTS

NH

10.
11.

12.

13.

..1

1.1.

General..... ..... . ...... .............................................
Removal Procedures .......................

2. 1. Top Cover Assy and Bottom Cover Assy .

2 2. Cassette Case Cover Assy . . . . .

2 3. Mechanism Assy ....................

2 4. Pin Jack P.C.B. Assy and Main P.C.B. Assy

2. 5. Front Panel .......................................

2 6. Bias Tune Volume P.C.B. Assy .

2 7, Control P.C.B. Assy ......

2. 8. Power Switch Joint . . .
Test Tapes and Gauges ........ . . . . . . . . . .
Mechanical Adjustments ......................................

4. 1. Tape Guide Height Check for Record/Playback Head and Erase Head . . . . .

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

4. 3. Record/Playback Head Azimuth Alignment and Height Check

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

4. 5. Tape Travelling Check . . . . . . . .

4, 6. Eject Damper Adjustment ...............

4. 7. Reel Motor Speed Adjustment' 1n Play Mode

4. 8. Tape Speed Adjustment. . . .

4. 9. Lubrication ..............

Parts Location for Electrical Adjustment.
Electrical Adjustments . . . . . . . . . . .
Mechanism Ass' y and Parts List . .

7. 1. Synthesis . . . . . .
Chassis Ass y (A01) ......

7. 2.
7. 3. Bottom Cover Ass y (A02),
7. 4. Mechanism Assy (BOI) .............................. .
7. 5. Front Escutcheon Ass y (1302}
Mounting Diagrams and Parts List . . . .
8. 1. Fuse P. C B. Ass y.
B. 2. Pin Jack P C. B. Ass y.
8. 3. InputVolumeP...CBA§y. .. . .. . .. ..
B. 4. Output Volume P. C. B. Ass y ................................................ 16
8. 5. Headphone P.C.B. Assy ............................................... . . . . 16
8. 6. Bias Tune Volume P.C.B. Assy
8. '7. Shut-off P.C B. Assy ..............
8. 8. Control P.C.B. Assy . .
8. 9. Main P.C.B. Assy . . .
Schematic Diagram ........ . . . . . . . . . . . . . .
9. 1. IC Block Diagrams ........................ 1 9
9. 2. Schematic Diagram ........................
Wiring Diagram ............
Block Diagrams ............ . .
11. 1. Amplifier Section ........
11. 2. Mechanism Control Section .........

Timing Charts and Eq. Amp. Frequency Response . .

12. 1. Timing Charts .................. 28
12. 2. Eq. Amp. Frequency Response . . . . . . . . . . . . . . . . . . . 29
Specifications ..... . . . . . ....................................................... 30

Voltage Selector

Voltage selector is installed on the rear panel for other version of the Nakamiohi 03-2.
This voltage select/or can select 110, 127, 220. or 240 v at customers disposaL