Nakamichi CR 2 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

Page 7

4.4. Pro-sure Adjustment of Pressure Roller

Refer to Fil. 4.3.

(1) In Play mode. measure the torque of the Pressure Roller and
check whether the torque is in a range of 320 250 z-em.

(2) If torque is out of the range. correct it by changing the instal-
lation point of the Pressure Roller Spring.

4.5. Tape Travelling Cheek

Load a Tape Travelling Cassette (DA09071A) and set the cassette

deck in Play mode to check the followings:

(1) After more than 2 seconds, the fluctultiun ot the tape travel-
line on the Record/Playback Head is small.

(2) Tape is in contact with the head sufficiently.

(3) Tape waving is small on the heads and pressure roller.

4.6. Eject Damper Adjustment
Refer to Fig. 4.4. Load a cassette tape. and with opening the
Cassette Case by pressing the Eject button and closing it by hand,
adjust the speed of damper action by the Damper Adjurtrnsnt
Screw.

CCW: Damper move: fast.

CW: Damper moves alowly.

4.1. Reel Motor Speed Adluatment in llay Mode

(1) Load a Toruue Genie FWD (DA09082A) and set the cassette
deck in Play mode.

(2) After Etc 10 seconds. adjust VRGOI on the Main P.C.B. Ass'y
to obtain exactly 45 s-om on the torque gauge.

4.8. Tape Speed Adilutment

Refer to Fit. 4.5.

(1) Connect a frequency counter to the Output Julia.

(2) Load a 3 kHz Speed and Wow/Flutter Tape (DA09006C) and
play it back.

(3) Adjust the Tape Speed Adjustment Volume incorporated in
the capstan Motor to obtain 8.000 H2 on the frequency
couter.

COW: Motor drives slowly.
CW: Motor drives fast.

4.9. Lubrication
The tape transport is of a lubrication-free type mechanism. When
the Inflowina parts are replaced. Apply the specified lubricant.
(1) Molykote ® Grease (X56020)
Cam Motor Pulley
Thrust portion on the capstan Shaft
(2) FLOIL GB-TSI
Washer between Reel Hub Auy and Back Tension Spring
(3) Diamond Oil (FR-66)
Reel Hub Shaft
(4) Andaoi 456
capstan sum
Note: We suggest that you use the above specified lubricant or
equivalent type.
The company dealini in the above lubricant is as follows:
(a) Molykote ® Grew (xeeozo)
Doweozninfl Co.. Ltd.. 1-15-1 Nishishinbuhi, Mineto-
kn. Tokyo, Japan
(b) FLOIL GB-lS-l
Kanto Chemicals Co.. Ltd., 2-7 Kanda Sakumn-chu,
Chiyoda-ku. Tokyo, Japan
(c) Diamond 01] (ELF-56)
Mitsubishi Oil Co., Ltd.. 1-2-4 Tor-nomon. Minato-ku,
Tokyo, anan
(d) Anderol 456
Tova Kokusai Oil 00.. Ltd., 3-3-5 Hatchobori, Chun-
ku. Tokyo, Japan

Decrease
0%

Increase

Fig. 4. 8

Capstan Motor

Fig. 4.5