Nakamichi CR 7 E Service Manual

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n Service Manual

Nakamichi

Nakamichi
CR-7
CR-7A
CR-7E

Discrete Head Cassette Deck

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CONTENTS

1.
2.
3.

11.

12.
13.

General .................. . ..........
Test Tapes and Gauges . . . . . . . . . . . .
Mechanical Adjustments .........................
1. Record Head and Playback Head Tilt Adjustment .
Head Base Stroke Check ...............................
Erase Head Stroke Adjustment and Tape Guide Height Check
Erase Head Height and Tilt Adjustment .
Playback Head Azimuth Center Adjustment
Playback Head and Record Head Height Adjustment and Azimuth Alignment
Tape Travelling Check ......... . . . .
Eject Damper Adjustment ...........
. Reel Motor Speed Adjustment 111 Play Mode
10. Tape Speed Adjustment ........
11. Lubrication ...........
Parts Location for Electrical Adjustment
Electrical Adjustments
5. 1. How to Use Measurement Tools
5. 2. Adjustment Instructions . .
5. 3. Playback Frequency Response Adjustment .....
Mechanism Assy and Parts List .
6. Synthesis
Chassis Assy (A01)
Front Escutcheon L Ass'y (1301)
Front Escutcheon R Assy (302) . .
Mechanism Assy (803)
Rear Panel Assy (B04)
Front Escutcheon R Sub Assy (C01) ,
D. D. Motor Ass y (D01) ........
'ng Diagrams and Parts List . . . .
Power Switch P.C.B. Assy .
Shut-off P.C,B. Assy .....
Azimuth Motor P.C.B. Assy
Timer Switch P.C.B. Assy . . .
Headphone Jack P.C.B. Assy . . . .
Azimuth Control P.C.B. Assy . . . .
Pin Jack P.C.B. Assy .....
Volume P.C.B. Assy .
Receiver P.C.B. Assy . . .
10. Remote Control P.C.B. Assy
11. Control Switch P.C.B. Assy . .
12. Display P.C.B. Assy . . .
13. Dolby NR P.C.B. Ass'y .
14. Power Supply P.C.B, Assy .
15. MainP.C.B Assy .
16. Logic P. C. B. Ass y
hematic Diagrams ......... . .
1. IC Block Diagrams ......
2. Schematic Diagrams .....
8 2.1. Display Section
8. 2. 2. Amplifier Section . .
8.2.3 Mechanism Control Section
Wiring Diagram .....................
Block Diagrams ....... . . . .
10. 1. Amplifier Section ....... . .
10. 2. Mechanism Control Section ..... . .
Timing Chart and Eq. Amp. Frequency Response . .
11. 1. Eq. Amp. Frequency Response .....
11. 2. Timing Chart ............... . .
Remote Control Unit RM-IC ...................
Specifications

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3.10. Tape Speed Adluatment
Refer to Fix. 3.8.

(1)
(2)
(3)

Connect a frequency counter to the Output Jack.

Load a 3 kHz Speed and Wow/Flutter Tape and play it back.
Adjust VRlOl on the Motor P.C.B. Assy to obtain 3.000 Hz
:15 Hz on the frequency counter.

3.11. Lubrication

The tape transport mechanism is of a lubrication-free type.
However, when the following parts are replaced with new ones.
apply the specified lubricant.

(1)

(2)
(3)
(4)

Molykote Greene (X 5-6020)

Cam Motor ulley

Thrust portion on the capstan Shaft

FLOIL GB-TS-l

Washer between Reel Hub Aaay and Back Tension Sprinfl
Diamond Oil (EP56)

Reel Hub Shaft

Andeml 456

Cnpstan Shaft

Note: We suggest that you use the above specified lubricant or

equivalent type,

The company dealing in the above lubricant is a: follows:

(a) Molykote® Grease (Ks-6020)
powcoming Co.. Ltd" 1-15-1 Nishishinbashi, Minste-
ku, Tokyo, Japan

(b) FLOIL GE-TS-l
Kanto Chemicals 00.. Ltd 2'7 Kanda sakumacho.
ohiyodn-ku, Tokyo, Japan

(0) Diamond on (BF-56)
Mitsubishi Oil 00.. Ltd., 1-2-4 Toranomon, Minato-ku.
Tokyo. Japan

(:1) Anderol 456
Tokyo Kokusai Oil C0,, Ltd" 3-3-5 Hatchobori. Chun-
ku, Tokyo. Japan

In: veu se

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Decvrase

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Molar Pas Ass'y

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