Nakamichi 582 Service Manual

Page 1

.ServiICe Manual

j ,NakamiChi

Nakamichi
582

t Discrete Head Cassette Deck

Page 2

CONTENTS
1. General ....................................................................... 3
2. Principle of Operation ........................................ . . ....... . ........... 5
2. 1. Mechanisms ............................................................ 5
2.1.1. 3-Head Configuration .................................. * ................. 5
(1) Playback Head ..................................................... 5
(2) Record Head . . . . . ......... . ....................................... 6
13) Erase Head ....................................................... 6
(4) Headblock .................... . .................................. 6
2.1.2. Double Capstan Tape Drive ............................................... 7
2.1.3. Mechanism Control Cam Operation .......................................... 8
2. 2. Amp. Circuits ........................................................... 9
2.2.1. Playback Eq. Amp. Circuit ................................................ 9
2.2.2. Record Amp. Circuit .................................................... 11
2.2.3. Bias Osc. Circuit ....................................................... 11
2.2.4. Test Tone Circuit ...................................................... 12
2. 3. Mechanism Control Circuits ................................................. 13
2.3.1. Logic Control ........................................................ 13
(1) C-MOS IC ........................................................ 13
(2) Logic Control and Other Circuits ......................................... 15
2.3.2. Shut-off Sensor and Detector .............................................. 20
2.3.3. Control Motor Drive Circuit ............................................... 21
2.3.4. Capstan Motor Governor ................................................. 22
2.3.5. Reel Motor Governor ................................................... 23
2. 4. Remote Control Unit RM~580 (Optional) ................... s .................... 24
2.4.1. lntroduction ......................................................... 24
2.4.2. Transmitter .......................................................... 24
2.4.3. Receiver ............................................................ 25
3. Removal Procedures .............................................................. 27
3. 1. Acrylic Cassette Compartment Cover ........................................... 27
3. 2 Top Cover Ass'y ......................................................... 27
3. 3 Bottom Cover Assy ...................................................... 27
3. 4. Front Panel Ass'y ........................................................ 27
3. 5. Mechanism Ass'y ........................................................ 27
3. 6 Main P.C.B. Ass'y ........................................................ 28
3. 7 Logic P.C.B. Assy ....................................................... 28
3. 8. Power Switch ........................................................... 28
3. 9. Volume P.C.B. Assy ...................................................... 28
3. 10. Control Button Assy ..................................................... 28
3. 11. Record Cal. P.C.B. Ass'y ................................................... 23
3. 12. Meter Assy ............................................................ 29
3. 13. Lamp P.C.B. Ass'y ............................... . ....................... 29
3. 14. Aluminum Mirror ........................................................ 29
3. 15. Rear Panel Ass'y ......................................................... 29
3. 16. Power Transformer ....................................................... 29
3. 17. Cassette Case Assy ....................................................... 29
3. 18. Cover Plate ............................................................ 30
3. 19. Tape Counter Assy ....................................................... 30
3. 20. Capstan Motor Ass'y and Flywheel Ass'y ........................................ 31
3. 21. Sub Mechanism Chassis Ass'y ................................................ 31
3. 22. Control Motor Ass'y ...................................................... 31
3. 23. Reel Motor Assy ........................................................ 31
3. 24. Carn Control Volume ......................................... . ........... 31
3. 25. Reel Hub Ass'y ......................................................... 31
3. 26. Idler Assy ............................................................. 31
3. 27. Cam Drive Gear and Control Cam ............................................. 31
3. 28. Head Mount Base Ass'y .................................................... 31

Page 5

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Fig. 1.1 From View

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Nahmlchi 552
was Mun can-om M

Fig. 12 Rear View

1.2. Voltage Selector
Voltage selector is installed on the rear panel for other versions of the Nakamichi 582.
This voltage selector can select either 120 V or 220 - 240 V at customers disposal.

Page 8

m

(c) Record Head Height Adjustment and Azimuth
Alignment

Record Head tilt adjustment can be performed in the
same way as (or the Playback Head.

Height adjustment can be adjusted while recording 400 Hz
test tone by loosening or tightening RH Height Adjust-
ment Screw to obtain the maximum level on the both
Level Meters. Azimuth alignment can be adjusted while
playing back 15 kHz test tone by ioosening or tightening
RH Azimuth Alignment Screw to obtain the maximum
level on the both Level Meters.

PH Height Adjustmeni

Take-up Tove Guide Adjustment
m Azimulh Alignment t

This system has also been carefully designed so as to
minimize influence each other between azimuth and
height adjustment.

(d) Erase Head Height and Tilt Adjustment

Erase Head is affixed onto the Erase Head Plate which is
assembled with the Head Base. It is installed with three
screws. By turning these screws. its height, tilt of back-
ward or irontward, and tilt of leftward or rightward can
be adjusted separately, thus the best location of Erase
Head can be obtained.

an mam Aaiusimem

t RH Azimuth Alignment Supply

Tape Guide Adjustment

=2.
$2; [-

H/

Fig. 2.1.6 Headblock

Center at Top: . -

0.1mm

_ Tape Width

Linn

Cenrnr or fish

Cenler at Truck

Center of Lch

Playback Head Record Head

Eros: Head

Fig. 2.1.7 Trackings

2.1.2. Double Capstan Tape Drive

As shown in Fig. 2.1.8, the double capstan system consists
of two capstan shafts (a) and (b) connected to the two fly-
wheels which are driven by a capstan belt.

Against these capstans two pressure rollers (21) and (b) are
engaged to run the tape with an adequate holdback tension
created by the double capstan and pressure rollers.

Since the diameter of capstan shaft (3) is smaller than that
of capstan shaft (b), when two flywheels begin to turn as
shown in the figure, capstan (a) runs slightly faster than
capstan (bi, which subsequently generates holdback ten-
sion.

As you note, if the diameters of the 2capstans should be
the same, the generation cycles of wow and flutter will be-
come approximately the same, as a result of which defe-

ctive portion will be doubly superposed and preferable
portion vice versa. The N-582 employs 2 capstans, each
having different diameter and rotations, thereby avoiding
the aforesaid occurrence and stabilizing wow and flutter
characteristics.

As the double capstan system always creates a constant
and stable holdback tension between the two capstans,
the condition of the tape between two capstans will not
be affected by any external conditions such as irregular
take-up and supply torques, irregular loading of cassette
tape, undesirable mechanism vibration and etc.. thus
assuring the superior wow and flutter characteristics.
The double capstan system provides a constant holdback
tension on the tape and maintains the stable pressure onto
the tape against the heads.

Page 38

5.4. Head Base Stroke Adjustment in Play and Cue
Modes
Before you conduct this adjustment, adjust with a
Tilt Check Gauge to insure freedom from tilt on
the playback head and record head.

Note:

(1) Head Base Stroke Adjustment in Play Mode

Refer to Fig. 5.7.

(a) Load a Stroke Check Gauge M-9047 (DA09047A) in
the N-582.

Move Record Head Indicator and Playback Head In-
dicator to the direction of arrow mark A" with your
finger tip and then set the N-582 in play mode.

Then slowly release the Indicators and insure whether
each of the Indicators is in contact with record and
playback heads.

Check to insure whether the P" pointer on the Play-
back Head Indicator locates between the 2 lines on
the Indicator Plate.

If the playback head stroke is noted to be misaligned,
adjustment can be made by moving the stroke adjut'
er assembled in the head base assembly (either for-
wardly or backwardly).

Check to insure whether the "P" pointer on the Play~
back Head Indicator locates between the 2 lines on
the Record Head Indicator, thus check can be made
on record head stroke.

lb)

(c)

(d)

(e)

Play Mods

Orm

Cue Mada

Fig. 5.7

37

(f) If the record head stroke is noted to be misaligned,
adjustment can be made with a Record Head Mount-

ing Gauge M-9048 (DA09048A).

(2) Head Base Stroke Adjustment in Cue Mode

Refer to Fig. 5.8.

(3) Load a Stroke Check Gauge M-9047 (DA09047A) in
the N-582. '

Move Record Head Indicator and Playback Head In-
dicator to the direction of arrow mark A" with
your finger tip and then set the N-582 in cue mode
(F.F. and Pause).

Then slowly release the Indicators and insure whether
each of the Indicators is in contact with record and
playback heads.

Check to insure whether the C" pointer on the
Playback Head Indicator locates between the 2 lines
on the Indicator Plate.

If the playback head stroke is noted to be misaligned,
adjust VR403 of the Logic P.C.B. Ass'y till satis-
factory results are obtained.

After completion of the Head Base Stroke Adjust-
ment, check to insure accuracy of the Head Base
Stroke Adjustment in play mode.

If the above are inaccurate, items (1) and (2) will
have to be repeated'till satisfactory results are obtain-
ed.

(b)

(c)

(d)

(e)

R505

VR403 100K

Fig. 5.8

Page 54

MODE

ADJUSTMENT

REMAR KS

Record and Playback
Monitor SW - Tape
Tape SW - ZX

Eq. SW - 70 us
Dolby NR SW - OUT

1. Erase the tape with bulk eraser.

2. Adiust record level controls to obtain 0 dB on the level meters, and
record the signals on the reference tape.

3. Rewind the tape then close record level controls.

4. Record and play it back, then measure the difference between 2 and
3.

Record and Playback
Monitor SW - Tape
Tape SW - ZX

Eq. SW - 70 ns

Dolby NR SW - lN/MPX

1. Feed in 400 Hz and record, and play it back.

2. Adjust the record level controls to obtain 3% total harmonic distortion
in playback mode.

3. Close the record level controls then record.

4. After rewound, play back and check the output level difference
between 2 and 3.

Note: The filter of lHF-A curve shall be used in the measurements.

Record and Playback
Monitor SW - Tape
Tape SW - EX/SX/ZX
Eq. SW - 120 us (EX)

70 us (SX/ZX)
Dolby NR SW - OUT

1. Adjust record level controls to obtain 0 dB on the level meters.

2. Record and play it back

3. Read the distortion meter and check to insure that the distortion
is less than 1.0% for each tape.

Plavback
Monitor SW - Tape
Eq. SW - 70 us

Playback and read the wow/flutter meter.

GAIN (43)
o

100

Fig. 7.10

Inru. 21'

nun

7o,"

400 1K 2K IOK 20K
FREQUENCY (N! )

Playback Equalization Curve

47

Page 80

Schematic

Ref. N 0. Part No. Description O'ty
CO1 HAOS777A Lamp Hausa Cover Ass'y 1
01 N03977B Lamp House Cover Holder 1
02 BA03974A Lamp P.C.B. Assy 1
03 OH03673A Lamp House Cover 1
O4 0H03674D Lamp House 3
L01 0500853A BT Screw M2x3 Philips Pan Head 2
L02 0500793A ET Screw MZXS Philips Binding 2

Head
001 CA0801 TB Flywheel Holder Ass'y 1
01 0008013| Flywheel Holder 1
02 0608135A Capstan Motor 1
03 0608079F Capsran Motor Pulley 1
L01 0E00226A Screw M2.6x4 Philips Pan Head 3
L02 OEOOGZSA Screw M2x3 Cup Point 1
L03 0C08068C Thrust Screw 2
L04 0603857A Lock Nut 2
D02 CA08065A Sub Mechanism Chassis Assy 1
01 OCOBOSQA Reel Hub Head 2
02 CA0803SB Reel Hub B Assy 2
03 CA08037A Reel Hub Take-up Ass'v 1
04 CA08064A Reel Hub Supplv Ass'y 1
05 CA08039A Back Tension Assy 1
06 0C08178A Back Tension Spring ,1
07 CA08040A Idler Ass'v 1
08 00081278 Idler Arm Spring 1
09 CA08042A Brake Arm Ass'y 2
1O 0C080300 Brake Drive Arm 1
11 0C08129A Brake Arm Spring 1
12 0008128A Brake Drive Arm Spring 1
13 0304042A Lug Terminal 1L2P 1
14 0509091 A Ceramic Capacitor 0.01;: 50V 2
15 CA08036A Reel Motor Assv 1
16 CA08034A control Motor Ass'y 1
17 00080533 Volume Coupler 1
18 OBO7Z4OA Volume Oantral 10Kfl (B) 1
19 CA08041 A Sub Chassis Ass'y 1
L01 0E00842A Stopper Ring 2mm 1
L02 0E00837A Stopper Ring 3mm 2
L03 0E00838A Stopper Ring 4mm 1
L04 0E00859A BT Screw M2.6x6 Philips Binding 1
Head

L05 0E00226A Screw M2.6x4 Philips Pan Head 6
L06 OE00843A BT Screw M3x5 Philips Pan Head 1

L07 - VDIUme Nur (1)

L08 - Volume Washer (1 l

63