manual: ec100 sm nakamichi en - archive.org
TRANSCRIPT
Nakamichi
Service Manual
Nakamicni BlackBox Series PS-100
SF-100
LA-100
BA-150
MB-150
EC-100
MX-100
Power Supply
Sub-sonic Filter
Line Amplifier
Bridging Adaptor MC Booster Amplifier
Electronic Crossover
Microphone Mixer .
CONTENTS
1. PS-100 Power Supply .u...cc.cccsscccsseccsnscnsessnscccssenserancesseeasercnenanss Gites seus tvae Don ates futheneacumauteceannted seal actetadat bacae Sunaecuancnens 1
General, Mute Signal, Specifications, Schematic Diagram, Mounting Diagram
and Parts List, Mechanism Ass’y and Parts List
2; SF-T00 SUD-SOMICG: FIlteh suaccedisedeapeawentecent ovescddvaeaneccuecnG cue cose henccan ceuapeadeecCacdsseawesenceis sncsedsueovsssacc sen sncbuoassupsdeaeaseesersentes 5
General, Specifications, System Diaper. Schematic Diagram,
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
3. LA-100 Line Amplifier _........ ss Sasealansbeicise dcid bine naam aioe aean'v obunwaawunendandeceaducstlemeds oveeGonadaaeedeckcncskueasensacscaiiesccswasuwusastaencweateerss 8
General, Specifications, System Diagram, Schematic Diagram,
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
4. BA<150 Bridging: AGatOr® «cccsisscssscsnsickssstsccevsteessiadsed ves cdecdencaescengeseediative si scsevdicnbesceavcddesusupsaccsasccqdecaseebenacekeonsewvresens: 11
General, Specifications, System Diagram, Schematic Diagram,
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
5. MB-150 MC Booster Aniplifier. -cciicccsvercsecsccvsteisncriduswosidnsvesedsseeceasnuscssdvadectesdavsveatooacsoneusuedaaeneansaanaseianme cnnoasarateoteeder 14
General, Specifications, System Diagram, Schematic Diagram,
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
6. “EG 100 Eleetronie CrossOver -sciissceccddccccisaicucaassccceesaeecianaasoiaunesniaccantiuedeacaasssesasuatenededsccpvevetecscascacisecewecswanasenseatoeeries 17
General, Specifications, System Diagram, Schematic Diagram,
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
7c (NDE TOO Microphone MIXCh isis cccccicccicswosescccccstacvessdersssonedenddsinnaalsnneedvep sane resteccsnsioancasaserdsscascneceussetonadsbecasuerswwseetee 20
General, Specifications, System Diagram, Seemae Dieacsn)
Mounting Diagram and Parts List, Mechanism Ass’y and Parts List
1. PS-100 POWER SUPPLY
General As a result, 0413 turns on and the mute signal is changed
PS-100 Power Supply
PS-100 is a regulated power supply unit designed to be a
power supply for the BlackBox Series (the rated output
current: £200 mA).
Although PS-100 is provided only with one output termi-
nal, two input/output terminals on the other units of the
BlackBox Series make multiple connection of PS-100
possible.
To prevent noise signal generation on switching ON/OFF
the power supply, PS-100 produces a mute signal, muting
output terminals of each unit furnished with a muting
circuit.
Refer to Table 1 showing how many units of the Black-
Box Series can be driven by a single PS-100.
Mute Signal
Mute signal is muted for a certain period of time to
prevent transient noise when power is ON or OFF.
Power ON
Transformer output is rectified through diode D403 and
smoothed by capacitor C408. Therefore, positive poten-
tial appears at C408 (transistor Q411 base). Accordingly,
0411 is in the cutoff state. C409 (22 uF) is charged with negative potential through R414 (1 M2), therefore at the
level where the voltage across C409 exceeds Vbe (base-
emitter voltage) of 0412, Q412 turns from OFF to ON.
from + V to —10 V, releasing the mute state. (The mute time depends on C409 and R414 after power is
ON.)
Power OFF
Transformer output becomes zero and so C408 is charged
with negative potential through R415. At the level where
the voltage across C408 exceeds Vbe of 0411, 0411 turns
from OFF to ON and C409 is quickly discharged. Thus,
Q412 is cut off and 0413 is also cut off. Therefore
the mute signal becomes + V (i.e. mute state). D402
acts to prevent + V from being discharged easily when
power is OFF.
Specifications Maximum Power Consumption... 20VA
Output Voltage. .........4.. +10V
Rated Output Current ........ + 200 mA
Dimensions .........-.0068:5 7-1/2(W) x 2-3/8(H) x 3-15/16(D) inches 190(W) x60(H) x 99(D) mm
W6IGNT 4.6.4 ne Sal ee ae aa re, Ee 3.5 lb, 1.6 kg
Table 1 Combinations of Units Driven by a single PS-100
LA-i00 BA-150 MB-150 EC-100 MxX-100
Sub-sonic Line Bridging MC Booster Electronic Microphone Filter . Amplifier Adaptor Amplifier Crossover Mixer
0.5 VA 1 VA 2 VA 1 VA 2 VA
(+25 mA) (+50 mA) (£100 mA) (£50 mA) (£100 mA)
Combination
a |
Maximum
Drivable
Number
of Units
ie) $ N
Schematic Diagram
MUTE
Q402 280235
C404 470 25V 120V. T1”
BRN YEL
M3 5P Terminal
O
i C402
100 25V C405 220u 25V
Power Switch
M2
Spark Killer Wl ozo
AC INPUT 120V~
Q405 U.S.A. /CANADA BLK 2$¢945
VERSION aaa A se
a Zs) | 1. i ea ee a [EUROPE VERSION, ———=<“C—s=i‘—S*~C~SSSCO 1 [JAPAN VERSION oy vey |
| 4 | | | | |
| is 3. | | | | sy ate ; | g aut :
3 Ss
| f 8 | | : | |
AC INPUT | 220V~ | | YEL |
L J L ee eee
Notes: 1. Fuses marked with «1 are not incorporated in the U.S.A. version.
2. The type of spark killer marked with *2 differs in some countries.
Mounting Diagram and Parts List
Schematic oie Schematic .
Serematie | pane, | Deserition
PS-100 P.C.B. Ass’y
0401,407
408,410
411,412
Q402
0403 ,404
405,409
413
0406
D401
D402,403
2D401
R 401,409
419
R402,408
R403
R404
R405,411
R406
R407
R410,418
R412
R413
R414,416
R415
R417
C401,403
C402 ,404
BA03855A
0B07720A
OBO6013A
0B01823A
0B01872A
0B06011A OB06088A 0B01909A OBO6063A 0B01781A
OB05824A OB05673A OBO5664A 0B05746A 0B01793A OBO5826A 0B01833A OBO5596A OBO5563A OBO5564A OB05674A 0B01921A 0B01401A
0B01272A
Power Supply P.C.B.
Transistor
Transistor
Transistor
Transistor
Silicon Diode
Silicon Diode
Zener Diode
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
2SA733
2SD235 (Y)
2SC945
2SB435
SiIRBA
181555
YZ040B
1K
4.7M
5.6K
3.9K
1
3.3K
11K
10K
220K
56K
1M
820K
330K
Electrolytic Capacitor
470u
Electrolytic Capacitor
100u
ERD-25V J
ERD-50T J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
ERD-25V J
25V
25V
C405
C406 ,407
C408
C409
OBO1391A
OBO01502A
0B01780A
OB05820A
0J03597B
OEO0607A
OE00507A
Electrolytic Capacitor
220
Electrolytic Capacitor
330u
Mylar Capacitor 0.1
Electrolytic Capacitor
22u
Heat Sink (1 pce.)
Screw M3x8 Philips Pan Head
(3A) (4 pes.) Nut Hex. M3 (2 pcs.)
25V
16V
50V J
16V M
(MS)
Mechanism Ass’y and Parts List
PS-100 Mechanism
OHO3509A
OM03799A
OMO3800A
BA03855A
0B08161U
OB06567A
OBO6568A
O0B08025U
OB08355A
0B07172A
0B07092A
0B08037A
OBO08351A
OB08325A
OB08350A
0B08219B
OB08348A
OB08149U
Notes: 1. 02, 08, 09 and 10 differ in versions.
2. 04 (fuse) is not incorporated in the U.S.A. version.
Upper Cover PS
Caution Label G
Caution Label H
PS-100 P.C.B. Ass’y
Fuse 630 mA
Power Transformer 100—120 V
Power Transformer 220—240 V
5P Terminal
4P DIN Socket
Power Switch
Power Switch
Cord Bushing
Cord Bushing
Cord Bushing
Power Cord
Power Cord
Power Cord
Power Cord wed wh eke ed ed etd etd eA) wd td
Fig. 1.3
Schematic ' ee
HA03697C
0H03437A
OBO8361A
OB08363A
OB08342A
0B08240A
O0BO07096U
0E00713A
OEOO606A
OE00538A
OE00594A
OE00714A
OEOO651A
OE00593A
OE00157A
Main Chassis PS Ass’y
Rubber Foot
Spark Killer 125 V (R + C) Spark Killer 125 V (R + C)
Spark Killer 125 V (R + C)
Spark Killer 250 V (R + C)
Spark Killer (C) Screw M3x6 Philips Truss Head
Screw M3x6 Philips Pan Head
(3A) Screw M4x5 Philips Binding
Head |
Screw M3x8 Philips Binding
Head
Screw M2.6x6 Philips Binding
Head
Washer 2.6 mm (plastics) Screw M3x6 Philips Binding
Head
Washer 3 mm (plastics)
Oop-erFr Fee FO
2. SF-100 SUB-SONIC FILTER
General Specifications
In disc record reproduction, low-frequency resonance ofa Maximum Power Consumption... 0.5 VA
tone arm and rumbling of a turn table exist at about 10 Zaet Consumption ........ ue = eee ‘ : Total Harmonic Distortion ..... ess than O. 6 zZ—
Hz and their peak level ranges approximately from 5 to 15 20 kHz, 1 V Output)
dB. Frequency Response......... 40 Hz — 100 kHz + 0.5 dB
SF-100 is an active filter to eliminate these noises. Sub-sonic Filter. .........-. 10 Hz: —50 cB,
The unit is designed so that no low frequency sound —40 dB (with Low
recorded on disc records is sacrificed and no change in Boost) t ‘nt tSctaG Low Boost: <a 44.5 Whe ee ews 30 Hz: + 5 dB
COE re ; ; _ Signal-to-Noise Ratio ........ better than 110 dB (IHF-A
To compensate the personal feeling of insufficiency in low Network)
frequency sound caused by the insertion of the Sub-sonic Mute Function ............ Furnished
Filter, a Low Boost Switch is provided which can boost Dimensions ...........55. 7-1/2(W) x 2-3/8(H) x
signal approximately by 5 dB at 30 Hz. 4-1/16(D) inches With both of the Fil Switch and L B, 190(W) x 60(H) x 103(D) mm
ith both of the Filter Switch and Low Boost Switch Weight... 2... eee eee eee 2.7 Ib, 1.2 kg turned OFF, the input signal directly appears on the
output terminals without passing through the Sub-sonic Filter. | System Diagram
ea
The output of the twin-T filter is amplified by Amplifier aad 2, while the output of the amplifier is positively fed back fags | Output
through C, and Rz to compensate the level reduction in C bos : > ©)
the range of 20—50 Hz. ee ps |
Further, to increase the attenuation below 5 Hz, the filter | | K)
load impedance is lowered with R,, and the improvement ; Out a See eae eee ind
of characteristics can be realized by changing impedance | OF ne out of of every device. | _ouut Mute Switch
In addition, a high pass filter is incorporated in the input Oln
side of Amplifier 1 to ensure an ideal sub-sonic filtering ____ Low Boost Switch
characteristics. Fig. 2.1
Schematic fos Schematic ae
Seramate | pane, | Description Sorts | raewo, | Deserintion
BA03849A_ | SF-100 P.C.B. Ass’y R114,115 | OB05562A Carbon Resistor 47K ERD-25V J
119,214
0B07719A SF P.C.B. 215,219
Q101,102 | OBOGO62A Transistor 2SC1222 (2) R116,216 | OBO5678A Carbon Resistor 560 ERD-25V J
201,202 R117,118 | OBO5567A Carbon Resistor 33 ERD-25V J
Q103,104 | OBO6013A Transistor 2SA733 217,218
203,204 C101,201 | OBO5682A Mylar Capacitor O.068yu 50V J
Q105,205 | 0B01872A_ | Transistor 280945 (L) C102,202 | 0B01863A_ | Electrolytic Capacitor D101,102 | OBO01909A Silicon Diode 181555 3.3u 16V
103,201 C103,105 | OBO5844A Mylar Capacitor 0.33u 50V J
202,203 203,205
R101,201 | OBO5700A Carbon Resistor ERD-25V J | C104,204 | 0B05832A Mylar Capacitor 0.0184 50V J
R102,202 | OB05564A Carbon Resistor ERD-25V J | C106,206 | OBO5639A Electrolytic Capacitor
R103,203 | OBO5563A Carbon Resistor ERD-25V J 1.54 35VM
R104,204 | OBO5608A Carbon Resistor ERD-25V J . (MS)
R105,205 | 0B01789A Carbon Resistor ERD-25V J | C107,108 | OBO5884A Electrolytic Capacitor
R106,206 | OBO5664A Carbon Resistor ERD-25V J 207,208 470u 10V
R107,207 OB01564A Carbon Resistor ERD-25V J O0B07167A Push Switch (1 pce.)
R108,109 | OBO01921A Carbon Resistor _ ERD-25V J | CN1 OB08182A 6P-T Post
208,209 CN2 OB08236A 4P-T Post
R110,210 | 0B01795A Carbon Resistor ERD-25V J
R111,211 0B01902A Carbon Resistor ERD-25V J
R112,212 | OBO5569A Carbon Resistor ERD-25V J
R113,213 OBO5565A Carbon Resistor ERD-25V J
Schematic Diagram
POWER S.F. P.C.B. R33. oN ey RED INPUT
CN-1 — §68bu YEL 5 Inpur OJ (1) Zi=50KQ -x ree:
ee ear 9 « & bed
BLK re)
6 R102 1M
LEFT
0 lout DIN JACK POWER
Fo O-IN e 3 | OUTPUT OUTPUT (C nae Ri09
o OUT at? 8 = ByOK 330K On woxe”
IN ec” Om ine)
ouTPuUT (©) 6)— | = Zo=5602 r PIN | RI=10KQ MUTE
R119 D103 Ig le 181555 47K sis No
J ziss :| 8 mit al? 9.8V Baas : \s
CN-I4 1c201 a 204 INPUT = (@}-8LY-G) K
Zi=50KQ = fe |
ia | 83 Ls BLK (4) ie
: RIGHT |
| OUT
IN
ouTPUT (©) OUT
6 O— IN es
ouTPUT (OF (6) Zo=5602 be IN RI=10KQ “1 — 5
D101 1S1555
C103 0.33, Ge. C203 0.33ud C105..0.33yJ
ee
Fig. 2.3
Mechanism Ass’y and Parts List
Fig. 2.4
i . . ti
i i ‘
| SF-100 Mechanism OE00157A Washer 3 mm (plastics) 7
OEOO606A Screw M3x6 Philips Pan Head
OHO3507A Upper Cover SF 1 (3A) BAO3849A SF-100 P.C.B. Ass’y 1 OE00612A Screw M3x6 Philips Pan Head
0J03654B Front Chassis 1 (2A) JAO3061A Push Button Ass’y 2 OE00507A Nut Hex. M3
0J03440A Switch E Block Base 1 OE00037A Earth Lug B-5
0B08290B 6P Pin Jack 1 OEO00594A Screw M3x8 Philips Binding
0J03277A Metal Seat Nut 2 Head
OBO8355A 4P DIN Socket 2 OE00714A Screw M2.6x6 Philips Binding
OHO3508B Main Chassis SF 1 Head
0H03437A Rubber Foot 4 OEOQO651A Washer 2.6 mm (plastics) 0E00713A Screw M3x6 Philips Truss Head 4
OE00593A Screw M3x6 Philips Binding 2
Head
3. LA-100 LINE AMPLIFIER
General
LA-100 is an amplifier with a flat frequency response that
may be inserted between amplifiers connected to input or
output of a tape deck or the like when the gain of the
amplifiers is insufficient.
The gain is selectable at four levels, 0, +6, +12, and +18
dB by combination of IN/OUT of two gain switches of 6
dB and 12 cB.
The voltage amplification of LA-100 at each status of the
switches is as follows:
S;: open, S,: close;
9.1k//27k Avi) = 6.8 k = 1 [0 dB]
S,: close, Sz: close;
_ 91kK//27k ,
Ava) =e gk/68k 7 2 1698!
S,: open, Sz: open;
_—(IM+9.1k)/ 27k | a) a“ Vom [12 dB]
S,: close, S.: open;
1M + 9.1 k) // 27 k Aya) — IM eS = 8 {18 dB]
6.8 k //6.8k
Schematic Diagram
L.A. P.C.B. an = ~
~ | Can
101,102 | C101 2SC1222 $e
CN-2 3.34 pals jy x2 rN
R17 9.1K{(G)
Ci07 410P
Specifications
Maximum Power Consumption...
Current Consumption ........
Total Harmonic Distortion .....
Frequency Response.........
Signal-to-Noise Ratio
Reference Level
Input Impedance ...........
Output Level/Output Impedance. .
Mute Function ............
Dimensions ..........++.25
WIGNT 2-6 bike ee 8 eee eee
System Diagram
Input
©
Q108 2SA733
C105 470u10V
27K(G)
1VA
50 mA
0.005% (20 Hz — 20 kHz,
1 V Output)
10 Hz — 75 kHz +0,
—0.5 dB
better than 100 dB (+ 18 dB
Gain)
Gain Switch O dB: 1V
6dB:0.5V
12 dB: 0.25 V
18 dB: 0.126 V
50 kQ
1 V/560 2
Furnished
7-1/2(W) x 2-3/8(H) x
4-1/16(D) inches
190(W) x 60(H) x 103(D) mm
2.7 |b, 1.2 kg
Out put
POWER QU TPUT
ral Om
Mounting Diagram and Parts List
Schematic Ref. No.
Q101,102
104,105
201,202
204,205
Q103,109
110,203
209,210
Q106,107
108,206
207,208
D101,102
103,104
105,201
202,203
204,205
R101,201
R102,202
R103 ,203
R104,115
204,215
R105,114
205,214
R106,107
206,207
R108,109
120,208
209,220
r
BA03859A
OBO7721A
OBO06062A
0B01872A
OBO06013A
OBO1909A
OB05700A
OBO5563A
OBO5608A
OBO5569A
OBO5559A
OBO05933A
OB05678A
Description
LA-100 P.C.B. Ass’y
LA P.C.B.
Transistor
Transistor
Transistor
Silicon Diode
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor 47
Carbon Resistor 680
Metal Film Resistor 6.8K
Carbon Resistor 560
Fig. 3.3
2SC1222 (2)
250945
2SA733
181555
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
ERO-25VK
G ERD-14V J
Schematic Ref. No.
R110,210
R111,211
R112,212
R113,213
R116,216
R117,217
R118,218
R119,219
R121,122
221,222
R123,223
R124 ,224
C101,201
C102,202
C103,203
C104,108
204,208
C105,106
205,206
C107 ,207
SWw1
CN1
CN2
0OB05661A
OBOS511A
OBO5663A
OBO5650A
OB05935A
OB05934A
OBO5564A
OBO5591A
OBO05567A
0B01920A
OB05562A
0B01863A
0B01404A
0B05744A
0B01412A
OB05884A
O0BO05798A
0B07170A
OBO08236A
0B08182A
Description
Carbon Resistor 22K
Carbon Resistor 820
Carbon Resistor 10
Carbon Resistor 12K
Metal Film Resistor 27K
Metal Film Resistor 9.1K
Carbon Resistor 1M
Carbon Resistor 15K
Carbon Resistor 33
Carbon Resistor 100K
Carbon Resistor 47K
Electrolytic Capacitor
3.3u
Electrolytic Capacitor
47
Ceramic Capacitor 33P
Electrolytic Capacitor
10u
Electrolytic Capacitor
470
Ceramic Capacitor 10P
Push Switch
4P-T Post
6P-T Post
ERD-14V J |
ERD-14V J
ERD-14V J
ERD-14V J
ERO-25VK
G
ERO-25VK
G
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
16V
6.3V
16V
10V
SUE22
Mechanism Ass’y and Parts List
LOT
0HO03518A
BA03859A
0J03654B
JA03061A
0J03440A
OB08290B
0J03277A
OBO8355A
OHO3519A
OH03437A
0£00713A
OEO0593A
LA-100 Mechanism
Upper Cover LA
LA-100 P.C.B. Ass’y
Front Chassis
Push Button Ass’y
Switch E Block Base
6P Pin Jack
Metal Seat Nut
4P DIN Socket
Main Chassis LA
Rubber Foot
Screw M3x6 Philips Truss Head
Screw M3x6 Philips Binding
Head
Fig. 3.4
OE00157A
OEOO606A
0E00612A
OE00594A
0E00037A
0E00714A
OE00651A
OE00507A
Nh DB B — AQ AQ = o AQ ar ao an
10
Washer 3 mm (plastics)
Screw M3x6 Philips Pan Head
(3A) Screw M3x6 Philips Pan Head
(2A)
Screw M3x8 Philips Binding
Head
Earth Lug B-5
Screw M2.6x6 Philips Binding
Head .
Washer 2.6 mm (plastics)
Nut Hex. M3
4. BA-150 BRIDGING ADAPTOR
General
Except for the exclusion of power supply from BA-150,
BA-150 is identical to the BA-100 presently available.
Connection of BA-150 across a preamplifier and stereo
power amplifiers allows the usage of stereo power ampli-
fiers in monaural use, and delivers the power amplifier
output twice the output in the stereophonic configuration.
The use of Nakamichi 420 or 620 power amplifier permits
the power output increase to 120W or 350W, respectively,
and thus the sound quality is expected to be improved.
Transistors Q101 and Q102 in the first stage constitute an
emitter follower and a constant current power supply
respectively. Q104 and Q105 constitute a differential
amplifier, and Q103 and D101 provide a current mirror
circuit. Q106 and Q107 constitute a phase inverter and
the output of Q107 is a phase-inverted signal of the input;
that is, this unit, receives an input signal and outputs it as
a non-inverted output and a phase-inverted output, and
permits bridging of the left and right outputs of the power
amplifiers to form a monaural power amplifier.
Schematic Diagram
B.A. P.C.B.
Q R101 C104 330 06910 16V
InpuT =§s QE % NSS mx +O oe awn fed
LEFT |
+O RED
Ox oO
R201 C201 INpuT (Q)EL
R203
RIGHT
RED R207 C202 +@ R216 6305
R208
Specifications
Maximum Power Consumption... 0.6 VA
Current Consumption ........ 25 mA
Reference Input Voltage ...... 1V
Input Impedance ........... 10 kQ
Reference Output Voltage ..... 1V
Output Impedance .......... 500 2
Maximum Input Voltage ...... 4V
Maximum Output Voltage ..... 4V
Maranarsiiee within 1° (5 Hz — 50 kHz) Phase-symmetry Degree
Dimensions .............4. 7-1/2(W) x 2-3/8(H) x
3-13/16(D) inches 190(W) x 60(H) x 97(D) mm
Went 6 6 ow Se pee Se a Se 2.4 lb, 1.1 kg
Non- inverted Output
Inverted Output
Q001 28C1222
aS C004 } 470u10V
@ T— xn
470, 10V )
7
470 10V
OUTPUT
Mounting Diagram and Parts List
Q001,101
102,104
105,201
202,204
205
Q002,103
106,107
203,206
207
D101,201
R001 ,002
105,205
201,213
R102,202
R103,203
R 104,204
R106,206
R107,116
207,216
R108,117
208,217
R109,115
209,215
R110,111
210,211
R112,212
R114,214
h Schematic
R101,113 |
BLU
RED
BLK
BAO3863A BA-150 P.C.B. Ass’y R118,119 | OBOSSE7A ial Resistor ERD-14V J |
218,219
0B07698B BA P.C.B. C003 ,004 OB05884A econ Capacitor
OBO6062A Transistor 28C1222 (2) 106,107 470u 10V
206,207
C101,201 0B01412A Electrolytic Capacitor
10u 16V
~C€102,105 | O0B01389A Electrolytic Capacitor
OBOGO13A Transistor 2SA733 202,205 4.7 16V
C103 ,203 0B01404A Electrolytic Capacitor
47y 6.3V
C104,204 | OBO05599A Ceramic Capacitor 150P 50V
OBO1909A Silicon Diode 181555 O0E00037A Earth Lug B-5 (1 pce.)
OBO5538A Carbon Resistor ERD-14V J 27K
0B01789A Carbon Resistor 330 ERD-14V J
OBO5665A Carbon Resistor 560K ERD-14V J
OBO5563A Carbon Resistor 56K ERD-14V J
OBO5596A Carbon Resistor 220K ERD-14V J
OB05558A Carbon Resistor 100 ERD-14V J
OB05678A Carbon Resistor 560 ERD-14V J
0B01920A Carbon Resistor 100K ERD-14V J
OBO05895A Metal Film Resistor 10K ERO-25VK
G 0B01782A Carbon Resistor 2.7K ERD-14V J
OBO5661A
0B01793A 22K
3.3K
Carbon Resistor
Carbon Resistor ERD-14V J
ERD-14V J
12
Mechanism Ass’y and Parts List
BA-150 Mechanism OE00037A Earth Lug B-5
OE00507A Nut Hex. M3
OE00594A Screw M3x8 Philips Binding
Head
OHO3523A Upper Cover BA-150
BAO3863A BA-150 P.C.B. Ass’y
0B08290B 6P Pin Jack
0JO3277A Metal Seat Nut
OBO8355A 4P DIN Socket
HA03709A Main Chassis BA Ass’y
0H03437A Rubber Foot
0E00713A Screw M3x6 Philips Truss Head
OEQO606A Screw M3x6 Philips Pan Head
(3A)
OE00157A Washer 3 mm (plastics)
0E00714A_ | Screw M2.6x6 Philips Binding Head
OEO0651A Washer 2.6 mm (plastics)
ha PR PND HH | =
13
5. MB-150 MC BOOSTER AMPLIFIER
General
MB-150 is a booster amplifier used to increase gain for an
MC type cartridge at low output level.
The gain can be selected at two levels of 38 dB/22 dB by
switching the Gain Switch ON/OFF. With the Pass Switch
set to ON, the input from the cartridge is directly deliv-
ered as the output without passing through the amplifier.
Complementary circuits used in all stages of MB-150 re-
duce distortion.
The first stage is composed of 10 PNP transistors and 10
NPN transistors, with low noise figures at small signal
source impedance, which are connected in parallel respec-
tively to ensure low noise figures.
The second stage adopts the particular triple transistor
configuration as used in the first stage of Nakamichi 610,
410, and 630 Equalizing Amplifiers, and its equivalent
input noise figure is less than —158 dB (with RIAA IHF-A
Network).
The first-stage transistors have the combination of NPN and PNP. Theoretically, if the characteristics of both types are the same, the collector currents of these tran- sistors are equal, and their base currents are the same if the current amplification he _’s are equal; therefore d.c. voltage across the input terminals vanishes at the identical values of + and — power supply voltage. In actual circuits, However, a + or — voltage slightly remains due to various factors and the voltage should be adjusted to zero by offset voltage adjustment.
System Diagram
38qB~
22dBU Gain
Offset Voltage Adjustment
1. Insert shorted pin plugs into input jacks of MB-150,
2. Connect a PS-100 power supply unit to the MB-150
and turn the power switch of the PS-100 ON.
3. Connect an amplifier to the output jacks and listen
to sound with headphones or a speaker.
. Adjust semi-fixed volumes VR101 and VR201 so
that switching noises generated at the ON/OFF
operaton of the pass switch reduce to a inaudible
level.
Specifications Maximum Power Consumption... 2VA
Current Consumption ........ 100 mA
Total Harmonic Distortion ..... 0.005% (20 Hz — 20 kHz,
0.3 V Output)
Frequency Response......... 20 Hz — 100 kHz +0, —1 dB
(+ 38 dB Gain)
10 Hz — 100 kHz +0,
—0.5 dB (+ 22 dB Gain)
—158 dB (RIAA, IHF-A
Network)
Equivalent Input Noise
Ref. Output Level/Output
Impedance
Ref. Input Level/Input Impedance .
5 mV/5.6 Q
0.4 mV/56 Q (+ 22 dB Gain)
63 ywV/56 Q (+ 38 dB Gain)
200 mV (+ 22 dB Gain)
30 mV (+ 38 dB Gain)
Maximum Input Level
Dimensions .............. 7-1/2(W) x 2-3/8(H) x
3-15/16(D) inches
190(W) x 60(H) x 100(D) mm
WOIGNt: . atic ace = Exel Se SS 2.9 Ib, 1.3 kg
Fig. 5.1
14
Mechanism Ass’y and Parts List
Fig. 5.2
Schemati ipti ,
MB-150 Mechanism OE00593A Screw M3x6 Philips Binding
Head
Schematic Ref. No.
LO2 2
OHO3521A Upper Cover MB 1 OE00157A Washer 3 mm (plastics) BAO3860A MB-150 P.C.B. Ass’y 1 OEQO606A Screw M3x6 Philips Pan Head
0J03654B Front Chassis 1 (3A)
0J03440A Switch E Block Base 1 OE00612A Screw M3x6 Philips Pan Head
JAO3061A Push Button Ass’y 2 (2A)
0B03920B Ground Terminal 1 0E00732A Washer 3 mm
O0JO3277A Metal Seat Nut 2 OE00037A Earth Lug B-5
OBO8394A 6P Pin Jack 1 OE00507A Nut Hex. M3
OBO08355A 4P DIN Socket 2 OE00594A Screw M3x8 Philips Binding
OHO03522C Main Chassis MB 1 Head
OH03437A Rubber Foot 4 0E00714A Screw M2.6x6 Philips Binding
0E00713A Screw M3x6 Philips Truss 4 Head
Head OEO0651A Washer 2.6 mm (plastics)
15
Schematic Diagram
R103 820
eine REET, CN TS OE ES SS A LS a Mr
R121 33
3.3K Q10i—Q110 = 2SA991x10 3 ae a
ye HOE &
bs ds cs hs i is hs 2801844 x10
ca C110 Zé 470y10V
Q116—-Q125
R108 150
C212 R215 INPUT
Arh aAarAAAe
i is Gf sa RIGHT
OUTPUT
Mounting Diagram and Parts List
K gy oe aan #% os &
“oe £ & Bex Su &
OUTPUT
(TR P.C.B.) 28C 1844 x5
Q121_ Q122 Q123 Q124 Q125
Q221 Q222 0223 0224 Q225
Q106 Q107 gios Q109 Qno
Q206 Q207 Q208 Q209 Q210 2SA991 x5
Fig 5.5
0101-113
201-213
Q114,214
0115,215
Q116-128
216-228
Q129,229
VR101,201
R101,201 R102,202 R103,104 203,204
R105,106 205,206
R107,108 207,208
R109,110 209,210
R111,112 211,212
R113,213 R114,214 R115,215 R116,216 R117,217
R118,218 R119,219 R120,220 R121,122 221,222
R123,124 223,224
C101,201 C102,103 202,203
C104,105 106,107 110,111 113,114 204,205 206,207 210,211 213,214
C108,109 208,209
C112,212 SW1 CN1
0B07722A
0B06120A
OBO6062A
0B01872A
0B06119A
OBO6121A
0B07159A
OB05587A
0B01885A
OBO5511A
0B01793A
OBO05649A
OBO5558A
OBO5545A
OBO5661A
0B01879A
OB05818A
OBO05562A
OBO05952A
OB05746A
OB05854A
0B01920A
OBO5567A
0B01833A
OB01914A
OB01289A
OB05884A
0B01288A
0B01290A
0B07167A
0B08236A
OBO8366A
0B07738A
Schematic —
BAO3860A MB-150 P.C.B. Ass’y
MB P.C.B.
Transistor
Transistor
Transistor
Transistor
Transistor
Semi-fixed Volume
Carbon Resistor
Carbon Resistor |
Carbon Resistor
Carbon Resistor
Carbon Resistor |
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor .
Carbon Resistor
Metal Film Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Mylar Capacitor
Ceramic Capacitor
2SA991 (26 pes.)
28C1222 (2)
280945
25C1844 (26pcs.)
2SA990
500
56 ERD-25V J
39K ERD-25V J
820 ERD-25V J
3.3K ERD-25V J
150 ERD-25V J
100 ERD-25V J
18 ERD-25V J
22K ERD-25V J
33K ERD-25V J
5.6 ERD-25V J
47K ERD-25V J
91 ERO-25VK F
1 ERD-25V J
6.8 ERD-25V J
100K ERD-25V J
33 ERD-25V J
10K ERD-25V J
3300P 50V
220P 50V
Electrolytic Capacitor
470u 10V
Ceramic Capacitor
100P 50V
Ceramic Capacitor 0.01u 50V
Push Switch SVE
4P-T Post
Shield Case MB (2 pcs.)
TR P.C.B. (2 pcs.)
6. EC-100 ELECTRONIC CROSSOVER
General
EC-100, a combination of a high-pass filter, a phase shifter
and an adder, separates an input signal into a high-passed
output and a low-passed output.
Each of the two output signals is delivered to a respective
power amplifier for driving a 2-way speaker system.
A combination of two or more EC-100’s makes it possible
to drive. a 3-way or 4-way speaker system.
The transfer function Gy(s) of a high pass filter is given
by the formula:
Gy (s) =
as.
The transfer function of Eq. 3 accords with that of a low
pass filter circuit. Therefore the output of the adder is a
signal of lower frequency range.
The crossover frequency setting of EC-100 at 19 steps
from 66 Hz to 7.4 kHz is possible by adjusting the
Frequency Control VROO1.
The Frequency Control is interlocked at 19 frequency
positions in total, including 10 positions marked on the
Frequency Control and 9 positions at the middle of them.
These frequencies are 66, 68, 78, 95, 120, 170, 250, 320,
370, 440, 530, 660, and 880 Hz and 1.4 k, 2.4 k, 3.9 k,
5.4 k, 7 k, and 7.4 kHz. The attenuation characteristic of
the filters is 12 dB/oct.
EC-100 has the same characteristics as conventional multi-
band filter circuits; however, in the crossover frequency
switching system of EC-100 is improved from conventio-
nal systems that have to change the resistance and capaci-
tance simultaneously to the system changing only the
resistance.
Note:
Specifications Maximum Power Consumption .. .
Current Consumption
Attenuation
es ses e© # 8s 8 « ©
es 8s e @ 8 8&s © 8 8 8 #@ 8 8 6
Distortion
Signal-to-Noise Ratio ........
Ref. Input Level/Input Impedance .
Ref. Output Level/Output
Impedance ..........0004
Maximum Input Level
Mute Function
Dimensions
Weight
System Diagram 2VA
100 mA
12 dB/oct.
66, 68, 78,95, 120, 170, Input
Cc > 250, 320, 370, 440, 530,
660, 880 Hz, 1.4 k, 2.4 k,
3.9 k, 5.4 k, 7 k, 7.4 kHz
less than 0.005% (20 Hz —
20 kHz)
better than 110 dB (IHF-A
Network)
1 V/50 kQ
1 V/560 2
4V
Furnished
7-1/2(W) x 2-3/8(H) x
3-15/16(D) inches
190(W) x 60(H) x 100(D)mm
2.4 Ib, 1.1 kg
Schematic Diagram
Resistors and capacitors marked with * will be adjusted in order to achieve
accurate crossover frequencies when frequency volume is interlocked at 19
positions.
The standard value of these resistors and capacitors are shown in the figure.
| 2SC900x3
cio CN-3 ton 46V
VROO1 200KC Frequency
_—— a ce ee ee ee a
‘\
C204
eee wie |
(9) N °o or
| | |
ee ee oe ae ee oie a | High Pass Filter |
a4 | 23 | 2s! Ph | ase Shifter
S| Se a a
* awd? es | : ! | z ! | | | | | | | ii ! (es cette eae ee en atest 3]
R110 1.8K
cr C104 | | C105 O.012u} | 0.042u 3
| IC
R2t2
C107 10u 16V 10
co)
R210
oo)
R2i5 w ec
C207
17
High Level
High
Volume ©) High Pass Out put
——— — ie)
| SS
| e | Mute
Low
| volume 7) Low Pass | Out put
| 06 | NaN
fons <a oc
Mute
GND (1)
iia BE: dl R301 Or
19 POWER OUTPUT
R123 excel
yd (4 WHT ©) Leh
i High Pass Output
1$1555 (2) ©) Sel
Q105 2sc945 eane
iy CN-2 YEL N (3) é ) as N
J CH Low Pass Output
josceas 4 O10, (a) 8LY__) ren 4 )) Rech
Low Level
Mounting Diagram and Parts List
© D203. R213 47K
Schematic Ref. No.
1C001,101
201
0101,102
103,201
‘202,203
0Q104,204
0.105,106
205,206
D101,102
103,201
202,203
VROO1
VRO002,003
R101,201
R102,202
R103 ,203
R104,204
R105,205
R106,206
R107,117
121,207
217,221
R108,109
208 ,209
301,302
R110,112
210,212
R111,113
211,213
Part No.
BA03868A
0B07739B
0B06124A
|0B01910A
OBO6066A
0B01872A
0B01909A
0B07182A
OB07181A
O0B05700A
0B01564A
OBO5608A
OBO05593A
OBO5606A
OB05688A
0B01833A
OBO5663A
0B01830A
OB05641A
Description
EC-100 P.C.B. Ass’y
EC P.C.B.
IC 4558
Transistor 2SC900 (E)
Transistor 2SD471
Transistor 2SC945
Silicon Diode 181555
Volume 200K (C)
Volume 10K (B)
Carbon Resistor 470K ERD-25V J
Carbon Resistor 82K ERD-25V J
Carbon Resistor 220 ERD-25V J
Carbon Resistor 150K ERD-25V J
Carbon Resistor 22 ERD-25V J
Carbon Resistor 390 ERD-25V J
Carbon Resistor 10K ERD-25V J
Carbon Resistor 10 ERD-25V J
Carbon Resistor 1.8K ERD-25V J
Carbon Resistor 47K ERD-25V J
Schematic Ref. No.
R114,115
118,119
214,215
218,219
R116,120
122,216
220,222
R123,124
223,224
C101,107
201,207
C102,103
202,203
301 302
C104,105
204,205
C106,206
C108,208
C109,209
CN1,2,3
18
Part No.
OBO5955A
OBO5566A
OB05678A
0B01412A
OB05884A
OB05843A
OB05681A
0B01862A
0B01913A
OB08236A.
Description
Metal Film Resistor 1OK
Carbon Resistor 2.2K
Carbon Resistor 560.
Electrolytic Capacitor
1Ou
Electrolytic Capacitor
470u
Mylar Capacitor 0.012yu
Mylar Capacitor 0.01y
Electrolytic Capacitor
22u
Mylar Capacitor 1800P
4P-T Post
ERO-25VK
D
ERD-25V J
ERD-25V J
16V
10V
16V
0HO3528A HA03714A BAO3868A 0J03689B 0B08290B 0J03277A OBO8355A HA03713A 0HO3437A 0E00713A
Mechanism Ass’y and Parts List
LO2 Fig. 6.4
EC-100 Mechanism
Upper Cover EC
VR Knob Ass’y
EC-100 P.C.B. Ass’y
VR Holder MX
6P Pin Jack
Metal Seat Nut
4P DIN Socket
Main Chassis EC Ass’y
Rubber Foot |
Screw M3x6 Philips Truss Head Dm PB - AQ A) a a 2 GW w=
19
OE00593A
0£00157A
OEOO606A
0E00507A
0E00037A
OE00594A
0E00714A
OE00651A
Screw M3x6 Philips Binding
Head
Washer 3 mm (plastics)
Screw M3x6 Philips Pan Head
(3A)
Nut Hex. M3
Earth Lug B-5
Screw M3x8 Philips Binding
Head
Screw M2.6x6 Philips Binding
Head
Washer 2.6 mm (plastics)
7. MX-100 MICROPHONE MIXER
General
MX-100 is a mixing unit having three microphone inputs
for L-channel, R-channel, and Blend. In addition to the
use as a simple microphone mixer connected to line input
terminals on a tape deck, the unit allows the application
to a PA (public address) amplifier directly connected to
an Aux. input of a preamplifier, etc.
Further, connection of this unit to Nakamichi 600 (a
cassette console) makes microphone recording by Naka-
michi 600 possible.
In addition, connection to the line input of a cassette
system, such as Nakamichi 7O00I!, 10001! or 500, allows
recording using six microphones. |
In Fig.7.1, the gain of the -channel microphone amplifier
is given by the formula:
es RV1 Av(L) R, + Rx, + RY oa ere 1
and the gain of blend microphone amplifier:
RY2 9
Av(B) “Ry + Rxp + RY” Swaine eee teh Ok Beate
The gains of the mixing amplifier:
il Av(ML)
Av(MB)
R</R3 (for L-channel mic. amp. output),
R./Ra (for Blend mic. amp. output).
System Diagram
Left \
R4
Blend
Blend Mic. R2 Volume
Riglt
Therefore the output of the L-channel is expressed as:
Rs R Av(LO) = Av(L)—= + Av(B)—>~
R3 Ra
Similar to the L-channel, the signal of blend microphone
is mixed in the R-channel.
Specifications
Maximum Power Consumption. . . 1VA
Current Consumption .....-+-- 50 mA
Total Harmonic Distortion ..... 0.05% (10 kHz, 1 V Output,
1 V Input)
Input Sensitivity ... 6... +++: 0.2 mV
Input Impedance ....-- +++: 10 kQ
Output Level/Output Impedance. . 100 mV/560 2
Maximum Input Level ......--- 1V (+ 74 dB)
Mute Function .....---+e+:5 Furnished
Dimensions .....--++e eee 7-1/2(W) x 3-3/8(H) x
4-5/16(D) inches
190(W) x 6O(H) x 110(D)mm
Weight... 6-00 ee ee es 2.7 |b, 1.2 kg
L Channel ©) Output
“6 LA
Mute
R Channel ©) Output
ae) LA,
Mute
Fig. 7.1
Schematic Diagram
MX. P.C.B.
| ty On re
C104 1580v oe | MIC. Ri02 | x Leh 100 9 ~N ae ae =o 2SA7T33
BLK & Q104 1a
2sc1222 NUN oF : YEL o OUTPUT
wo
on Q106 700 Vv = 28C945 be
R15 &
a -.
40K(G)
BLU
MIC.
Rech
0.2mvV
BLK OUTPUT UO Rech
100mV
- DIN JACK
BLEND MIC 6
0.2mV 8 Q303 % 280945
BLK cN-1 Oo
Ez i OUTPUT
Fig. 7.2
21
Mounting Diagram and Parts List
Schematic eae Schematic dads
BAO3866A
Q101,104
201,204
1 301
0102,105
202,205
302
Q103,106
107,203
206,207
303
D101,102
201,202
VR101,201
301
R101,201
301
R102,123
124,202
223,224
302
R103,203
303
R104 ,204
304
R105,205
305
R106,206
306
R107,207
307
R108,208
308
0B07724A
OBO6062A
OBO6013A
0B01872A
0B01909A
0B07175A
OBO5563A
OBO5558A
OBO5591A
OBO01564A
OB05847A
0B01878A
OBO5669A
OBO5661A
MX-100 P.C.B. Ass’y
MX P.C.B.
Transistor 2SC1222 (2)
Transistor 2SA733
Transistor 2SC945
Silicon Diode 181555
Volume 10K (C)
Carbon Resistor 56K ERD-14V J
Carbon Resistor 100 ERD-14V J
Carbon Resistor 15K ERD-14V J
Carbon Resistor 82K ERD-14V J
Metal Film Resistor 51 ERO-25VK
F
Carbon Resistor 8.2K ERD-14V J
Carbon Resistor 180K ERD-14V J
Carbon Resistor 22K ERD-14V J
R109,209 | 0B01792A 309
R110,120 | OBOS562A 122,126 210,220 222.226 310 |
R111,211 | OBO01795A 311,312
R112,212 | OBO5673A R113,114 | OBOS645A 213,214 313,314
R115,116 | OBO5895A 215,216 |
R117,217 | OBOS650A R118,218 | OBO5538A R119,219 | 0B01789A R121,221 | 0B01793A R125,225 | OBO5678A C101,104 | 0B01412A 107,108 201,204 207,208 301,304
C102,202 | 0B01288A 302
C103,203 | 0B01394A 303
C105,106 | OBO5885A 205,206 305,306
C109,110 | OBO5841A 209,210
CN1 OB08236A
22
n
Carbon Resistor 470
Carbon Resistor 47K
Carbon Resistor 4.7K
Carbon Resistor 5.6K
Carbon Resistor 270
Metal Film Resistor 10K
Carbon Resistor 12K
Carbon Resistor 27K
Carbon Resistor 330
Carbon Resistor 3.3K
Carbon Resistor 560
Electrolytic Capacitor
10u
Ceramic Capacitor 100P
Electrolytic Capacitor
220u
Electrolytic Capacitor
100u
Electrolytic Capacitor
330u
4P-T Post
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14T J
ERO-25VK
G
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
ERD-14V J
16V
6.3V
10V
10V
Schematic Rcd 7 Schematic
LO2
OHO3526A
HA03714A
BAO03866A
0J03689B
0B03882A
OB08362A
OB08355A
HA03711A
0H03437A
0E00713A
Mechanism Ass’y and Parts List
MX-100 Mechanism
Upper Cover MX
VR Knob Ass’y
MX-100 P.C.B. Ass’y
VR Holder MX
Headphone Jack
2P Pin Jack
4P DIN Socket
Main Chassis MX Ass‘y
Rubber Foot
Screw M3x6 Philips Truss
Head
Fig. 7.4
fA ND ]H WHS | WO
LO3
LO4
LO5
LO6
LO7
OE00593A
O0E00157A
OEOQO606A
OE00766A
O£00714A
OEO0651A
2 Screw M3x6 Philips Binding
Head
Washer 3 mm (plastics)
Screw M3x6 Philips Pan Head
(3A) Screw M3x8 Philips Binding
Head TP
Screw M2.6x6 Philips Binding
Head
Washer 2.6 mm (plastics)