Nakamichi CR 2 E 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 10

51!? I]!!! SIGIAL ournn non: ADJUSI- REMARKS

scum: summon EXIT

8 Playback 400 Hz AC Volt- Playback Main 1. Load a 400 Hz level tape. play it
Frequency Level Tape meter to Eq. - 70 us P.C.B. back, and read the playback level.
Response (DA09DOSB) Output Dolby NR - VRlOG 2. Load 10 kHz, 15 kHz and 20 kHz PB
Adjustment 10 kHz PB Jacks OFF VRZOG frequency response tapes and play

Frequency MPX - OFF them back. Adjust the record/play-
Response back head azimuth to obtain maximum
Tape readings for both channels on the
(DAOQOOSB) AC voltmeter with each tape.
15 kHz PB Check that the playback levels are
Frequency as follows with respect to the level
Response for [500 Hz level tape.
Tape 10 kHz: -20 dB -2 to +2 dB
(DA090023) 15 kHz: -20 an -2 to +3 as
20 kHz PB 20 kHz: -20 dB -2 to +4 d3
Frequency If the level at 20 kHz is out of the
Response range, adjust VR106 (VRZOG) to obtain
Tape satisfactory results. VR106 (VRZOS)
(DA090013) compensates the playback frequency
response at 20 kHz as shown below:
Approx. 5dE
IOK 20K
3. Conduct step 6 "Record/Playback Head
Azimuth Alignment".

9 Bias None Frequency Record,Pause Main 1. Connect an additional 0.1 ohm resistor
Oscillation Counter Eq. - 70 ps P.C.B. in series to the Erase Head and
Frequency between' Tape ZX T301 connect the Ac voltmeter across it.
and Erase terminals Dolby NR - C317 2. Adjust T301 to obtain 105 kHz :1 kHz
Current 1 and 2 OFF C318 on the frequency counter.

Adjustment of CN2 on MPX - OFF If bias oscillation frequency is above
Main P.C.B. W304 106 kHz, short-circuit C317 and C318,
and and re-adjust T301 again.

AC Volt- 3. Adjust W304 to obtain 17.5 mV (175 nA)
meter on the Ac voltmeter. (16.5 1 1 mV (165
across the 1 10 M will be accepted.)
additional A. After completion of the erase current:
0.1 ohm adjustment, re-check the bias
resistor oscillation frequency.

5. Remove the additional 0.1 ohm resistor.

10 Bias Trap None AC Volt- Same as Main Adjust L103 (1.203) to obtain minimum
Adjustment (remove meter to above P.C.B. reading on the AC voltmeter.

(Record input 1210132201 L103

Amp.) signals) on Main L203
P.C.B.