Nakamichi PS-100, SF-100, LA-100, BA-150, MB-150 MC Service Manual
...Service Manual
Nakamichi
Nakamichi
BlackBox Series
PS-100 Power Supply
SF-1 00 Sub-sonic Filter
LA-1 00 Line Amplifier
BA-1 50 Bridging Adaptor
MB-1 50 MC Booster Amplifier
EC-100 Electronic Crossover
MX-1 00 Microphone Mixer
CONTENTS |
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1. |
PS-100 Power Supply |
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1 |
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General, Mute Signal, Specifications, Schematic Diagram, Mounting Diagram |
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and Parts List, Mechanism Ass'y and Parts List |
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2. |
SF-100 Sub-sonic Filter ................ |
• |
............................................................................... |
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..................................... •. |
5 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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3. |
LA-100 Line Amplifier ......................................................................................................................................... |
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8 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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4. |
BA-150 Bridging Adaptor |
•.......................................................................... ........ |
• |
•....................................... |
•.• ...... |
11 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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5. |
MB-150 MC Booster Amplifier ............................................................................................................................. |
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14 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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6. |
EC-100 Electronic Crossover ................................................................................................................................ |
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17 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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7. |
MX-100 Microphone Mixer |
............. ...... .. ................ ........ .................. .. ........ .... ........................ |
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.......... .... .............. |
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20 |
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General, Specifications, System Diagram, Schematic Diagram, |
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Mounting Diagram and Parts List, Mechanism Ass'y and Parts List |
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1. PS-100 POWER SUPPLY
General
PS-100 Power Supply
PS-100 is a regulated power supply unit designed to be a power supply for the BiackBox Series (the rated output current: ±200 mA).
Although PS-100 is provided only with one output terminal, two input/output terminals on the other units of the Black Box 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 BlackBox 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 potential appears at C408 (transistor 0411 base). Accordingly, 0411 is in the cutoff state. C409 (22 µF) is charged with negative potential through R414 (1 Mn), therefore at the level where the voltage across C409 exceeds Vbe (baseemitter voltage) of 0412, 0412 turns from OFF to ON.
As a result, 0413 turns on and the mute signal is changed 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, 0412 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 . . . |
20 VA |
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Output Voltage ............ |
± |
10 V |
Rated Output Current . . . . . . . . |
± |
200 mA |
Dimensions .............. |
7-1/2(W) x 2-3/8(H) x |
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3-15/16(0) inches |
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190(W) x60(H) x 99(0) mm |
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Weight . . . . . . . . . . . . . . . . . |
3.5 lb, 1 .6 kg |
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1
Table 1 Combinations of Units Driven by a single PS-100
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PS-100 |
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SF-100 |
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LA-100 |
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BA-150 |
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MB-150 |
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EC-100 |
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MX-100 |
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Power |
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Sub-sonic |
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Line |
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Bridging |
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MC Booster |
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Electronic |
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Microphone |
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Supply |
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Filter |
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Amplifier |
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Adaptor |
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Amplifier |
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Crossover |
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Mixer |
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Rating |
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4 VA |
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0.5 VA |
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0.5 VA |
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1 VA |
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2 VA |
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1 VA |
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2 VA |
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C±200mAJ |
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(±25 mA) |
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(±25mAJ |
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(±50 mAJ |
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C±100 mAJ |
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<±50 mAJ |
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<±100 mAJ |
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1 |
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0 |
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0 |
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0 |
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2 |
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0 |
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0 |
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3 |
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0 |
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0 |
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0 |
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Combination |
4 |
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0 |
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0 |
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0 |
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5 |
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0 |
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6 |
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0 |
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7 |
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0 |
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Maximum |
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Drivable |
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B |
8 |
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4 |
2 |
4 |
2 |
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Number |
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of Units |
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Schematic Diagram
POWER SUPPLY P.C.B.
0402
250235
I
I
+10V
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., |
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AC INPUT |
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r--.., |
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R417 |
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12ov- |
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I F402 |
I |
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330K |
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U.S.A. I CANADA |
ls30mA,TI |
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VERSION |
L __ |
_J |
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I |
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L __ |
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0406 |
R411 |
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2SB435 |
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IJAPANVERSlON- -----:,;-,;--;:--, |
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SP T~r;,!nal YEL |
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I A;~g~ |
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ov |
YELi |
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L----------·~---_J |
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Fig. 1.1 |
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Notes: 1. |
Fuses marked with |
* 1 are not incorporated in the U.S.A. version. |
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2. |
The type of spark |
killer marked with |
*2 differs in some countries. |
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2
Mounting Diagram and Parts List
Fig. 1.2
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Schematic |
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Part No. |
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Description |
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Schematic |
Part No. |
Description |
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Ref. No. |
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Ref. No. |
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BA03855A |
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PS-100 P.C.B. Ass'y |
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C405 |
OB01391A |
Electrolytic Capacitor |
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Power Supply P.C.B. |
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220µ |
25V |
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OB07720A |
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C406.407 |
OB01502A |
Electrolytic Capacitor |
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0401,407 |
I OB06013A |
I T rans1stor |
2SA733 |
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330µ |
16V |
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408,410 |
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C408 |
OB01780A |
Mylar Capacitor |
0.1µ |
50V J |
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411,412 |
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Transistor |
2SD235 (Y) |
C409 |
OB05820A |
Electrolytic Capacitor |
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0402 |
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OB01823A |
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22µ |
16V M |
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0403,404 |
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OB01872A |
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Transistor |
2SC945 |
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(MS) |
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405,409 |
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OJ03597B |
Heat Sink |
(1 pee.) |
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413 |
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Transistor |
2SB435 |
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OE00607A |
Screw M3x8 Philips Pan Head |
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0406 |
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OB06011A |
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(3A) (4 pcs.) |
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D401 |
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OB06088A |
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Silicon Diode |
S1RBA |
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OE00507A |
Nut Hex. M3 |
(2 pcs.) |
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D402,403 |
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OB01909A |
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Silicon Diode |
1S1555 |
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ZD401 |
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OB06063A |
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Zener Diode |
YZ040B |
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R401.409 |
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OB01781A |
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Carbon Resistor |
1K |
ERD-25V J |
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419 |
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OB05824A |
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Carbon Resistor |
4.7M |
ERD-50T J |
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R402,408 |
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R403 |
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OB05673A |
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Carbon Resistor |
5.6K |
ERD-25V J |
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R404 |
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OB05664A |
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Carbon Resistor |
3.9K |
ERD-25V J |
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R405,411 |
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OB05746A |
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Carbon Resistor |
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ERD-25V J |
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R406 |
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OB01793A |
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Carbon Resistor |
3.3K |
ERD-25V J |
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R407 |
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OB05826A |
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Carbon Resistor |
11K |
ERD-25V J |
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R410.418 |
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OB01833A |
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Carbon Resistor |
10K |
ERD-25V J |
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R412 |
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OB05596A |
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Carbon Resistor |
220K |
ERD-25V J |
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R413 |
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OB05563A |
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Carbon Resistor |
56K |
ERD-25V J |
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R414,416 |
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OB05564A |
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Carbon Resistor |
1M |
ERD-25V J |
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R415 |
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OB05674A |
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Carbon Resistor |
820K |
ERD-25V J |
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R417 |
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OB01921A |
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Carbon Resistor |
330K |
ERD-25V J |
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C401,403 |
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OB01401A |
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Electrolytic Capacitor |
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470µ |
25V |
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C402,404 |
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OB01272A |
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Electrolytic Capacitor |
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100µ |
25V |
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3
Mechanism Ass'y and Parts List
>------ |
01 |
03
07
06
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Fig. |
1.3 |
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Schematic |
Part No. |
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Description |
Q'ty |
Schematic |
Part No. |
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Description |
Q'ty |
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Ref. No. |
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Ref. No. |
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PS-100 Mechanism |
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11 |
HA03697C |
Main Chassis PS Ass'y |
1 |
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12 |
OH03437A |
Rubber Foot |
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(R + C) |
4 |
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01 |
OH03509A |
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Upper Cover PS |
1 |
13 |
OB08361A |
Spark Killer |
125 V |
1 |
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02 |
OM03799A |
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Caution Label G |
1 |
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OB08363A |
Spark Killer |
125 V |
(R + C) |
1 |
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OM03800A |
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Caution Label H |
1 |
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OB08342A |
Spark Killer |
125 V |
(R + C) |
1 |
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03 |
BA03855A |
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PS-100 P.C.B. Ass'y |
1 |
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OB08240A |
Spark Killer |
250 V |
(R + C) |
1 |
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04 |
OB08161U |
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Fuse 630 mA |
2 |
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OB07096U |
Spark Killer |
(C) |
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1 |
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05 |
OB06567A |
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Power Transformer 100-120 V |
1 |
L01 |
OE00713A |
Screw M3x6 Philips Truss Head |
4 |
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OB06568A |
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Power Transformer 220-240 V |
1 |
L02 |
OE00606A |
Screw M3x6 Philips Pan Head |
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06 |
OB08025U |
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5P Terminal |
1 |
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(3A) |
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07 |
OB08355A |
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4P DIN Socket |
1 |
L03 |
OE00538A |
Screw M4x5 Philips Binding |
2 |
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08 |
OB07172A |
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Power Switch |
1 |
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Head |
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OB07092A |
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Power Switch |
1 |
L04 |
OE00594A |
Screw M3x8 Philips Binding |
2 |
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09 |
OB08037A |
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Cord Bushing |
1 |
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Head |
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OB08351A |
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Cord Bushing |
1 |
L05 |
OE00714A |
Screw M2.6x6 Philips Binding |
2 |
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OB08325A |
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Cord Bushing |
1 |
L06 |
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Head |
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2 |
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10 |
OB08350A |
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Power Cord |
1 |
OE00651A |
Washer 2.6 mm (plastics) |
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OB08219B |
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Power Cord |
1 |
L07 |
OE00593A |
Screw M3x6 Philips Binding |
2 |
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OB08348A |
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Power Cord |
1 |
LOB |
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Head |
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2 |
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OB08149U |
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Power Cord |
1 |
OE00157A |
Washer 3 mm (plastics) |
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Notes: 1. |
02, 08, 09 and |
10 differ in versions. |
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2. |
04 (fuse) is not incorporated in the U.S.A. version. |
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4
2. SF-100 SUB-SONIC FILTER
General
In disc record reproduction, low-frequency resonance of a tone arm and rumbling of a turn table exist at about 10 Hz and their peak level ranges approximately from 5 to 15 dB.
SF-100 is an active filter to eliminate these noises.
The unit is designed so that no low frequency sound recorded on disc records is sacrificed and no change in tones is effected.
To compensate the personal feeling of insufficiency in low frequency sound caused by the insertion of the Sub-sonic Filter, a Low Boost Switch is provided which can boost signal approximately by 5 dB at 30 Hz.
With both of the Filter Switch and Low Boost Switch turned OFF, the input signal directly appears on the output terminals without passing through the Sub-sonic Filter.
The output of the twin-T filter is amplified by Amplifier 2, while the output of the amplifier is positively fed back through C2 and R2 to compensate the level reduction in the range of 20-50 Hz.
Further, to increase the attenuation below 5 Hz, the filter load impedance is lowered with R4 , and the improvement of characteristics can be realized by changing impedance of every device.
In addition, a high pass filter is incorporated in the input side of Amplifier 1 to ensure an ideal sub-sonic filtering characteristics.
Specifications
Maximum Power Consumption ... |
0.5 VA |
Current Consumption . . . . . . . . |
25 mA |
Total Harmonic Distortion |
less than 0.005% (50 Hz - |
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20 kHz, 1 V Output) |
Frequency Response .. |
40 Hz - 100 kHz± 0.5 dB |
Sub-sonic Filter ..... |
10 Hz: -50 dB, |
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-40 dB (with Low |
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Boost) |
Low Boost . . . . . . . . . . . . . . |
30 Hz: + 5 dB |
Signal-to-Noise Ratio . . . . . . . . |
better than 110 dB (I HF-A |
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Network) |
Mute Function . . . . . |
Furnished |
Dimensions . . . . . . . |
7-1/2(W) x 2-3/8(H) x |
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4-1 /16(D) inches |
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190(W)x60(H)x 103(D)mm |
Weight ................. |
2.7 lb, 1.2 kg |
System Diagram |
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Output
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I |
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I |
I |
I |
I |
I |
I |
. I |
L ______ _J
Twin T Filter
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Out |
Filter |
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Mute |
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Switch |
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Fig. 2.1
Schematic |
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Part No. |
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Ref. No. |
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BA03849A |
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OB07719A |
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0101,102 |
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OB06062A |
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201,202 |
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0103,104 |
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OB06013A |
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203,204 |
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0105,205 |
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OB01872A |
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D101,102 |
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OB01909A |
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103,201 |
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202,203 |
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R101,201 |
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OB05700A |
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R102,202 |
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OB05564A |
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R103,203 |
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OB05563A |
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R104,204 |
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OB05608A |
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R105,205 |
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OB01789A |
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R106,206 |
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OB05664A |
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R107,207 |
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OB01564A |
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R108,109 |
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OB01921A |
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208,209 |
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R110,210 |
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OB01795A |
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R111,211 |
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OB01902A |
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R112,212 |
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OB05569A |
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R113,213 |
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OB05565A |
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Description |
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SF-100 P.C.B. Ass'y |
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SF P.C.B. |
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Transistor |
2SC1222 (2) |
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Transistor |
2SA733 |
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Transistor |
2SC945 (L) |
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Silicon Diode |
1S1555 |
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Carbon Resistor |
470K |
ERD-25V J |
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Carbon Resistor |
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1M ERD-25VJ |
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Carbon Resistor |
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56K |
ERD-25V J |
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Carbon Resistor |
220 |
ERD-25V J |
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Carbon Resistor |
330 |
ERD-25V J |
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Carbon Resistor |
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3.9K |
ERD-25V J |
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Carbon Resistor |
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82K |
ERD-25V J |
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Carbon Resistor |
330K |
ERD-25V J |
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Carbon Resistor |
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4.7K |
ERD-25V J |
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Carbon Resistor |
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68K |
ERD-25V J |
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Carbon Resistor |
47 |
ERD-25V J |
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Carbon Resistor |
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1.2K |
ERD-25V J |
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Schematic |
Part No. |
Description |
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Ref. No. |
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R114,115 |
OB05562A |
Carbon Resistor |
47K |
ERD-25V J |
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119,214 |
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215,219 |
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ERD-25V J |
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R116,216 |
OB05678A |
Carbon Resistor |
560 |
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R117,118 |
OB05567A |
Carbon Resistor |
33 |
ERD-25V J |
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217,218 |
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C101,201 |
OB05682A |
Mylar Capacitor |
0.068µ |
50V J |
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C102,202 |
OB01863A |
Electrolytic Capacitor |
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3.3µ |
16V |
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C103, 105 |
OB05844A |
Mylar Capacitor |
0.33µ |
50V J |
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203,205 |
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C104,204 |
OB05832A |
Mylar Capacitor |
0.018µ |
50V J |
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C106,206 |
OB05639A |
Electrolytic Capacitor |
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1.5µ |
35V M |
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(MS) |
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C107,108 |
OB05884A |
Electrolytic Capacitor |
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207,208 |
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470µ |
10V |
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OB07167A |
Push Switch |
(1 pee.) |
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CN1 |
OB08182A |
6P-T Post |
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CN2 |
OB08236A |
4P-T Post |
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5
,~~::;;.. |
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u |
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2 |
RIGHT |
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OUTPUT |
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lOUTPUT |
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<O |
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2 |
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u |
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Zo•56on |
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RI •10K!l. |
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Schematic Diagram |
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S.F. |
P.C.B. |
R117 |
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33 |
r~~:::~
BLK
LEFT
I OUTPUT
R118
33
lOUTPUT
Zo•560Sl RI •10Kn
Fig. 2.2
6
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