Pioneer SC-100 User manual

OPERATING INSTRUCTIONS
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PHOTO I
CONTENTS
F'EATURES OF THE MODEL SC-IOO
FUNCTIONS OF CONTROLS AND S\^/ITCHES ON
F'RONT PANEL
FUNCTIONS OF TERMINALS AND SWITCHES ON
REAR PANEL
TIPS F''OR OPTIMUM USE OF SC-IOO A
SCHEMATIC CIRCUIT DIAGRAM OF THE SC-TOO T3
SPECIF'ICATIONS OF THE SC-IOO 14
2
4

FEAT TRES OF THE MODBL SC-TOO
EXTREMELY WIDE, DYNAMIC RESPONSE EXTENDING BEYOND AUDIBLE
RANGE-THE KEY TO A TRUE HIGH-FIDELITY REPRODUCTION.
To elirninate hitherto experienced various problerns of distortion in highs, the
equalizer of ernitter-to-ernitter feedback systern is ernployed in this unit.
AMPLE ADAPTABILITY WITH VARIOUS TYPES OF CARTRIDGE.
A head arnplifier is incorporated {or rnoving coil type cartridge of 1ow output
voltage. And also, any other types of cartridge can be used by changing input
irnpedance.
PRECISE TONE CONTROL FOR PERFECT MUSIC REPRODUCTION.
Cornpletely flat tone is always assured with the tone controls set at the position
forflat. Also, a crispfrequencyresponse is obtainable by adjusting the controls.
SHARP CUT-OFF CHARACTERISTICS OF THE FILTER.
The filter provided in this unit cuts off harrnful extraneous frequencies with its
sharp cut-off characteristics of l2 dB per octave droop.
):< EMPLOYMENT OF SOLID STATE STABILIZED PO'il/ER SUPPLY FOR REPRO-
DUCING CLEAN, PLEASING SOUNDS.
Because of the stabilized power supply ernployed for this unit, the functions
this unit rernain stable, and reproduction of highly clean, pleasing sounds
always assured together with irnproved Signal-to-Noise ratio.
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2
PHOTO 2

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CONSIDERATELY DESIGNED STRUC TURE.
For easiness of handling, the input and output terrninals are rnounted on the slant-
ingpanel provided on the upper part of the rear of the unit. Because of this con-
siderate design, the jacks and connected. points are cornpletely free frorn break-
ing or loosening even when you push the unit hard against the wall unintentionally.
(Photo 2)
EXTREMELY HIGH QUALITY PARTS FOR PROFESSIONAL ACOUSTIC UNITS
ARE USED IN THIS UNIT.
For exarnple, a high precision attenuator is ernployed for the volurne control,
and the printed circuit board is of epoxide resin.In addition, the user-oriented
design of this unit is fu1ly reahzed in that the input switch is provided very near
to the input terrninal. (Photos 3 & 4)
PFIOTO 3
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3
PHOTO 4

FIJNCTIONS OF CONTROLS AND SWITCI{ES ON FRONT PAINEL
10 11 12 FIG.I
SELECTOR
This input selector switch provided to select prograrn source-records and
tapes, will function only when the lever switch (6) is set upward.
PHONO --pe1 record playing by . record player equipped with a rnagnetic
4
3
2
8
7
6
LOVT
rlz
Note:
cartridge.
-When using a cartridge of low output voltage.
(..g. rnoving coil type cartridge)
-When using a standard cartridge.
(e. g. rnoving rnagnet, induced rnagnet typ", etc. )
At the rnark PHONO - 2, the input irnpedance can be changed to
three different irnpedance, 20 ko, 50 ko, and 100 ko, by rneans of
the irnpedance selecting switch (26) provi.ded on the rear panel of
the SC- 100.
TAPE HD.-For direct connecting with tape-head output.
lgcrn or 7-IlZ When you playback a tape recorded at the speed of lgcrn
(7-ll2 inches) p.t second.
9.5crn or 3-314 V/hen you playback a tape recorded at the speed of 9.5crn
(3-314 inches) p"r second.
ATTENUATOR LOW F LTER H CH F LTER

I
Z MODE SWITCH
This switch is provided to select stereophonic playing or rrronophonic playing.
STEREO-REV For stereophonic playing. The left and right channels are
reversed.
STEREO-NORM For norrnal stereophonic playing.
MoNo L For rnonophonic playing by the left channel signal.
MONO R For rnonophonic playing by the right channel signal.
MONO L + R For rnonophonic playing by the le{t and right channel signals
rnixed.
3 VOLUME CONTROL
This is provided to control the level of sound.
If youturn the control counterclockwise, the volurne of sound will be decreased
accordingly.
4. BASS CONTROL, 5 TREBLE CONTROL
These controls are provided to control the bass and treble responses.
6 LEVER SWITCH
ll/hen the lever switch is set upward, the circuit of the selector switch ( 1)
becornes operative, disabling the aux/tuner switch (7). Likewise, when it is
set downward, the circuit of the aux/tuner switch (?) becornes operative, dis-
abling the selector switch (1).
7 AUX/TUNER SWITCH
This switch is provided to select AUX l, TUNER and AUX 2. This selecting
switch works when the lever switch (6) is set downward.
B TAPE MONITOR SVT]TCH
When it is set to ON, recording state can be rnonitored during recording. In
this case, however, it is needed to connect the terrninals for recording and
rnonitoring.
Norrnally, it rnust be set to OFF, otherwise the speakers do not operate.
9 BALANCE CONTROL
This control is used to balance the sound levels frorn the left and right channel
speakers.
5

I O ATTENUATOR S\^/ITCH
With this attenuator, the volurne can be attenuated in either of two stages,
-15d8 and -30dB.
11 LOW FILTER SV/ITCH
When set to 30 Hz, this filter cuts off the frequency lower than 30 Hz at IZ
dB/oct droop. When set to 60 Hz, it cuts of{ the frequency lower than 60 Hz at
IZ dBloct droop.
TZ HIGH FILTER SWITCH
When set to lt klF'z, it cuts off the frequency higher than ll klHz at lZdB/oct
droop.
When set to 6 klts,z, it cuts off the f requency higher than 6 kIHz at LZdB I oct
droop.
13 POV/ER SWITCH
Thi.s is the power switch.
FUNCTIONS OF TERMINALS AND S\^/ITCHES ON REAR PANEL
6
14 15 16 17 1819 20 21 22232425 26 27
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28 29 30
F'IG.2

.I
L4 AC OUTLET TERMINALS
These are the auxiliary AC outlets,
They are not coupled with the power
AC OUTLET TERMINALS
These are the auxiliary AC outlets
They can supply AC power of up to
OUTPUT TERMINALS
which supply AC power of up to 400 W.
switch ( 13).
coupled with the power switch (13).
400 IM.
T6
L7
l8
15.
i9.
These arethe output terrninals of the SC-I00. Output I and Z are connected in
paral1e1 inside the unit.
TAPE REC TERMINAL
This is the terrninal for tape recording. It will be connected with the line input
terrninal of your tape recorder.
TAPE P" B. TERMINAL
This is the terrninal for tape playback or for rnoni.toring. It will be connected
to the line output terrninal of your tape recorder or tape deck, or to the tape
rnonitor terrninal
AUX Z TERMINAL, ZO AUX 1 TERMINAL
These are the auxiliary input terrninals.
TUNER TERMINAL
Thi.s is the input terrninal for the tuner.
TAPE HD. TERMINAL
This is to connect with the output of the playback head of your tape recorder.
PHONO 2 TERMINAL
This is to connect with a record player equipped with a rnagnetic tape car-
tridge. And, this terrninal can be connected with the three different input
sources with irnpedance, 20 kO, 50 kO, and 100 kS2by rneans of the irnpedance
selecting switch (26).
PHONO 1 TERMINAL
This is to connect with a record player
tridge.
ZT
zz
z3
7
1^
LA
equipped with a rnagnetic type car-

I
25 PHONO LO\^/ TERMINAL
This is to connect with a record player equipped with a rnagnetic type cartridge
o{ low output voltage.
26 IMPEDANCE SELECTING SWITCH
\,Vith this switch, the input irnpedance for PHONO Z can be changed to 20 ko,
50 ko, and 100 ko.
27 GND TERMINAL
This is the grounding terrninal.
ZB AC CORD
29 FUSE HOLDER
When it has to be replaced, be sure to use a fuse of 0.5A.
30 LINE VOLTAGE SWITCH
Be sure to set the switch to 117V, norrnally.
TIPS FOR OPTIMUM USE OF' SC-TOO
SELECTING OF INPUT CIRCUIT
Twokinds of input circuit are provided in the prearnplifier; one is for very 1ow input
Level sources (e.g. rnagnetic cartridge or tape head), and the other is for corn-
paratively high input level sources (e.g. tuner or AUX).
Since changingthe circuits frornone to the other only by one switch is not ideal when
considering noise trouble, the selector switch (1) is provided for this rnodel for
selecting low input leve1 sources; and the lever switch (?), for selecting high inpul '
level sources.
These switches are used as {ollows.
When the lever switch (6) is set upward, the switch (1) becom-es operative for low
input level sources, and when it is set downward, switch (7) becornes operative,
dis abling the switch ( 1 ) .
For exarnple, when trvo different kinds of input sources (..g. a tuner and a record
player) are to be used, connect the tuner to the switch (7) and the record player to
the switch(1)sothat changing of the input circuits can be easily done only by setting
the switch (6) upward or downward. a

ABOUT VOLUME CONTROL (3) AND ATTENUATOR SWITCH (10)
Ahighprecision step-type attenuator switch which can be used. even for professional
broadcasting units is ernployed for the volurne control of this unit. This type of
attenuator, however, can not provide continuous control of the sound volurne-
strictly speaking. This inadequacy presents an acoustic problern in such cases when
a recordplayer equipped with a cartridge of high output voltage or a basic arnplifier
of high gain is used in cornbination with this SC- 100. In other words, sound. will not
ccirne out frorn the speakers when the volurne control is set to the rnaxirnurn cut-off
point( oo ) but sound rnay be tooloud if the volurne controlis set to one step higher
position tr-60rr.
To solve this problern, it is recornrnend.able for you to set the attenuator (I0) to -15
dB or -30 dB so that ideal volurne rnay be obtained with the volurne control set to
il_(;0il.
Note: Difference in sensitivity of basic arnplifiers can be explained. frorn the fact
that sorne basic arnplifiers with 30 W output require the input of 1 V to take
out the 30 v/ output while others require the input of only o.z y.
Although you can adjust the input level if your basic arnplifier is provided
with the volurne control for such a purpose, it is still recornlrlendable for
you to adjust the input leve1 with the attenuator of the SC-100.
ABOUT THE TONE CONTROLS
The characteristic of the controls used in the SC-100 is basically different frorn
that of ordinary tone controls whose response curve varies continuously. As shown
in the characteristic graph, only necessary f requencies are selected with the con-
trols to rnake thern enhance or attenuate. At the sarne tirne, the varying quantity of
the rniddle range is considerably suppressed. Flence, if the tonal quality of the re-
produced sounds frorn both the left and right speakers is not equal due to the back-
ground conditions, it is adjustable with the tone controls.
Since the sensibiiity of hurnan ears is weak to lows and highs, it is recornrnendable
foryouto raise both the high and 1ow frequencies a little when the reproduced sound
level is low.
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