Pioneer SX-727 Technical manual

()rrloNEER"
scan by [email protected] - NOT FOR RESALE

FEATURES
SENSITIVE & HIGHLY SELECTIVE FM STEREO
TUNER
The tuner circuits are equipped with a two-stage RF ampli-
fier, selected FET and transistor in the front end, resulting
in very linear amplification irrespective of incoming signal
strength. Therefore no cross-modulation or spurious radia-
tion interference. Moreover, ceramic filters in the lF stage
and a newly developed lC in the FM lF stretch give very
high selectivity, capture ratio and limiting effect. Clean FM
reception even in fringe or station-crowded areas. Antenna
terminals for 300Q feeder and 75O coaxial cable.
OCL (OUTPUT.CAPACITOR-LESS), PU RE COM-
PLEMENTARY POWER AMPLI FIER
A revolutionary design principle using PNP and NPN silicon
pov/er transistors for highest sound purity and absence of
distortions. Balanced (+) and (-) power supply and direct
coupling of all amplifier stages, therefore extremely wide
frequency response down to sub-audio range.
FULL CHOICE OR PROGRAM SOURCES
All standard program sources can be connected, including
two turntables two tape decks and an auxiliary sound
source as well as a microphone.
LINE VOLTAGE AND FUSE
The SX-?27 ts available in two models: one model
operates only on 120V, and the other operates on
one of the five line voltages, 110V , 120V, 130V,
220V and 240V. If your SX-727 is the latter model,
set the unit to the proper line voltage by following
the procedure described below.
CHANGING LINE VOLTAGE SETTING AND
FUSE
To remove the fuse, turn the fuse cap located on
the line voltage selector in the direction of the
arTow.
Then remove the fuse plug from the unit. Put the
fuse plug back so that the proper line voltage mark-
ing can be seen through the cut in the edge of the
plug. Whenever the position of the selector is
changed, check the rating of the fuse. A 1.5A fuse
is to be used for either 220Y or 240Y operation
and a 3A fuse for 110V, 120V or 130V operation.
If the rating of the fuse is correct, replace cap.
TAPE-TO-TAPE DUPLICATING POSSI BLE
With the two (open reel or cassette) tape decks, copies of
tapes can be made easily.
UP TO THREE PAIRS OF LOUDSPEAKERS
For easy comparison of speaker systems, or for main/remote
speaker installations, up to three pairs of speakers can be
connected and operated individually or A+8, A+C.
FULLY EOUIPPED WITH VERSATILE CON-
TROLS
Click-stop tonecontrols, separate for each channel. Low and
high noise filters, FM muting for noise-free tuning, audio
muting switch for instant volume reductions, speaker selec-
tor and three pairs of speaker terminals permits speakers to
be used separately or A+B A+C. Jacks include MIC lN, two
phono inputs, two tape decks headphones.
PRACTICAL AND AT THE SAME TIME ELE.
GANT DESIGN
With an exceptionally long dial for easy tuning. Easy,
perfect tuning with signal strength meter and center zero
meter. Slightly slanted front panel for easier dial reading.
Plus the incomparable PIONEER elegance of harmoniously
matched metal, black and natural wood.
FUSE R EPLACEMENT
When the fuse blows, remove
place the fuse with a new one. the fuse cap and
See Fig. 1.
Fis. 1
scan by [email protected] - NOT FOR RESALE

ASSEMBLING A STEREO SYSTEM
Model sx-727 is a stereo Receiver, i.e. it combines an AM/
FM stereo tuner, a preamplifier and a power amprifier in
one unit. To obtain a complete stereo system, it can be
combined with 2, 4 or even 6 speakers, 1 or 2 turntables.
7 or 2 tape decks, etc. See Fig. 2.
By adding an electronic crossover network (Pioneer SF-
500, SF-700, for example) and 1 or 2 additional power
amplifiers, a 2-way or 3-way multi-amplifier system can be
built. See Fig. 3.
With the help of the Pioneer "4-channel decoder,' Ampli-
fier, model QL-600A and an additional pair of speaker
systems, the SX-727 can serve as the heart of an ultra-
modern 4-channel stereo system. See Fig. 4.
TURNTABLE
ELECTRONIC
CROSSOVER
NETWORK
...o I o.-.
TAPE DECK
POWER AMP
POWER AMP
TJIONEEfiI
HIGH
MID
LOW
HIGH
MID
':*
Fig. 3
TAPE DECKS
CARTRIDGE
TAPE PLAYER
SPEAKER SYSTEMS Fis.2
@oQ QooQoo@ooooee
oooooo
. oooo
TURNTABLE
O.O O*Oooeooooeo
SPEAKER sysrEMs Fig.4
scan by [email protected] - NOT FOR RESALE

INSTALLATION
Do not install the SX-I27 rn the following places:
. In direct sunlight or near heating units.
. In damp, dusty places or where air circulation is poor. '
o In vibration-prone, unstable places.
o Do not put inflammables on the upper surface of the unit
nor cover a ventilator with its function-preventives.
Prepare a shelf or a stand durable enough for the large-size,
weighty SX-?27 to be installed.
A WORD ABOUT ROOM ACOUSTICS
The quality of reproduced sound varies according to the size
and shape of the room, the materials of walls, floor and ceil-
ing and the amount and arrangement or furniture. Too
"'harsh" or "bright" a sound usually results from too many
hard reflecting surfaces, and/or too low a ceiling. This condi-
tion is improved by having ample carpeted area or covering
the wall (especially that facing the speakers) with a thick
curtain. On the other hand, too many absorbing surfaces will
tend to "soak up" the sound, resulting in a certain "deadness."
Furniture may be rearranged to provide irregular reflection of
the sound. In any event, the true stereo effect is lost if the
two speaker systems are placed too far apart. This may be
corrected by angling them slightly toward each other or re-
ducing the distance between them.
SPEAKER CONNECTION AND ITUSTALLATION
CONN ECTION
o As shown in Fig. 5, connect the lead wires of the
system to the supplied speaker plugs. Be sure to
the correct polarity and to cause no short between
(-).
o For the
Connect
and the
o For the
speaker
pair.
NOTE: When using two pairs of speakers simultaneously (with the SPEAKER
switch set to A + B or A + C), make sure that the impedance of each
unit is at least BSl.
INSTALLATION
Optimal stereo effect is obtained when the listener is at the
vertex of a regular triangle whose base is the line connecting
the left and right speakers (approx. 3ft. to 8ft. apart).
Wherever possible, install the speakers at the same height; if
the difference in height is too great, the stereo effect
deteriorates.
speaker
observe
@ and LE FT
CHANNE L
RIGHT I
CHANNEL I
main set of speakers, use the A speaker sockets.
the right-channel speaker to the socket marked R,
Ieft channel speaker to the socket marked L.
second (third) pair of speakers, use the B(C)
sockets. Connect in the same way as for the first
SPEAKER SYSTEM
Fis. 5
scan by [email protected] - NOT FOR RESALE

PIONEEfiI
ANTENNA AND GROUND CONNECTIONS
FM ANTENNA
FM broadcast signais are obstructed somewhat by mountains,
buildings, and other obstacles. Therefore, even if a station is
nearby, a high-gain antenna may be required. Select the
antenna in accordance with the following rules:
. If the receiver is to be located in a wooden building and
stations are nea.rby, use the T-type antenna which comes
with the SX-727. As shown in Fig.6, connect the feeder
terminals of the antenna to the FM antenna terminals.
Stretch out the antenna proper and secure it to the ceiling
or a wall in such a manner that pickup is optimum, as
determined by listening to the station to be received. Refer
to FM RECEPTION on page 9.
o If orientation of the T-type antenna does not eliminate
background noise, connect an outdoor antenna to the
antenna terminals shown in Fig. 7. Instead of an FM
antenna, a combination FM/TV antenna may be used.
NOTES: 1. A variety of FM antennas are available. Consult your dealer for
selection.
' ; " :: : I :fr ;1 fi:"J J" i :,x"l',," I:,"i"" I "'" J:: :: # il ?h' :'iil::
may not give the desi red noise attenuation. ln such cases, consult
f ,:: ff TL : : ":::l I : i ffi ' : ",,::: : J; :Ti " :'"Ti J: i "' ? ;"
"y
ceiver as shown in Fig. B.
AM ANTENNA
o Refer to AM RECEPTIOI{ on page 9. With an AM station
tuned in, position the ferrite antenna for optimum pickup.
See Fig. 9.
o If positioning of the ferrite antenna does not give satisfy-
ing results, stretch out the AM lead antenna (vinyl-insulated
wire) and connect it to the AM antenna terminal. Keep the
othes end of the antenna lead as high as possibie.
o If the lead antenna does not give satisfying results, erect an
outdoor antenna and connect it as shown in Fig. 7. Special
construction is not required; vinyl-insulated wire may be
stretched between two masts or other supports.
GROUNDING
o A ground lead is not necessary for reception. Still, from
the viewpoint of safety and elimination of noise, one should
be used.
DIRECTION OF STATION
CONDUCTOR
(+l
OUTER
SHIELD
(BRAIDI
COAXIAL CABLE
(75-ohm)
Fis. 6
AM ANTENNA
Strip the end of the
coaxial cable as shown in A.
Loosen the screws shown
in B. lnsert the stripped
end of the coaxial cable.
Tighten the screws. Fis. B
Fig. 9
scan by [email protected] - NOT FOR RESALE

scan by [email protected] - NOT FOR RESALE

scan by [email protected] - NOT FOR RESALE

TJTONEEfiI I
BEFORE SWITCHING THE POWER ON
set the SPEAKERS switch to the position A after checking
the following:
1. VOLUME control is at MIN.
2. MODtr switch is at STEREO (not pushed).
3. BASS, TREBLE controls are at FLAT.
4. BALANCE control is at NORM.
5. The AUDIO MUTING switch must be OFF (not pushed).
6" The TAPE MONITOR switches (1,2) must be oFF (not
pushed) except for the tape playback or monitoring.
FM RECEPTION
1. Set the SELECTOR switch to the FM AUTO position.
2. set the FM MUTING switch to the oN position. (Keep the
switch OFF if the station is weak.)
3. while observing the meters, tune in the desired station by
turning the TUNING knob. Best reception is attained when
the needle of the SIGNAL METER deflects to the right,
and the needle of the FM TUNING METER is at the center.
when the station is broadcasting a stereo program, the FM
STEREO INDICATOR lights, and model SX-Z2Z operates
automaticaliy for stereo broadcast reception.
4. when the desired station has been tuned in, turn the
voLUME control gradually clockwise for the desired vol-
ume. Adjust the BASS and TREBLE controls as desired.
AM RECEPTION
1. Set the SELECTOR switch to AM.
2. While observing the SIGNAL METER, tune in the desired
station by turning the TUNING knob. Best reception is
attained when the needle of the signal meter deflects to
the right.
3. When the desired station has been tuned in, adjust the
VOLUME, BASS, TREBLE controls for desired volume
and tone.
RECORD PLAYING
1. Set the SELECTOR switch to PHONO 1 or PHONO 2.
2. Start the turntable.
3. Adjust the volume and tone with the VOLUME, BASS and
TREBLE controls.
NOTES:
'1 . ln a f ringe area or where reception is noisy, turning
rhe SELECTOR switch to "FM MoNo,,wiil usualty
eliminate the noise. ln this case, however, stereo
broadcasts will be reproduced as monophonic.
2. ln some ccuntries, model SX-127 is delivered with a
selector switch for adjusting the FM de-emphasis to
set either of 50 and 751rsec. lf your unit is equipped
with such a switch at the inside of the right-sided
chassis, and if the high range of sound gives an im-
pression of sharpness or hissing, move the de-emphasis
switch to its other position.
NOTE:
lf good reception cannot be attained by steps 1 through 3
in AM RECEPTION the antenna may be the cause. Refer
to ':ANTENNA AND GROUND CONNECT|ON,, on
page 4. When the station is very near, sound distortions
may result from the high f ield strength. lf this occurs,
shorten or remove the AM antenna,
NOTE:
Set to PHONO 1 for using the turnrable plugged into the
PHONO 1 jacks, and to PHONO 2 for using the turntable
plugged into the PHONO 2 jacks.
I
scan by [email protected] - NOT FOR RESALE

USING A TAPE DECK
Three different types in tape deck are available on the market;
open-reel type, cassette type and cartridge type, If your tape
deck is equipped with pre-amplifiers used for recording and
piayback, the tape deck can be connected directly to the
sx-7 27 .
RECORDING
As shown in Fig. 10, during playing the signal is always pres-
ent at the TAPE 1 REC and TAPE 2 REC jacks. Operate the
SX'-727 as explained in the sections FM and AM RECEPTION
and RECORD PLAYING on page g.
NOTE. Adjusting the VOLUME, BASS and TREBLE controls on the SXJ21
does not affect the signal present at the TAPE 1 REC and TAPE 2
REC jacks. Fecording level must be adjusted on the tape deck itself.
O TAPE MONITOR
If the tape deck is of the 3-head type or is fitted with a tape
monitor circuit, the recording can be monitored by setting
the TAPE MONITOR switches (1 or 2) to ON. The recording
and playback connections must both be left attached.
PLAYBACK
Asshown in Fig. 10, setting the TAPE MONITOR switch 1 to
ON permits playback of the tape on tape deck 1, and setting
TAPE MONITOR switch 2 to ON permits piayback of the
tape on tape deck 2. During playback, volume and tone can
be adjusted by the VOLUME, BASS and TREBLE controls
on the SX-727. Playback is possible regardless of which the
SELECTOR switch is positioned.
DUPLICATING OR EDITING RECORDING TAPES
With the SX-727, it is possible to record, say, an FM stereo
broadcast and then re-tape the parts of the broadcast one
wishes to keep onto a separate tape.
1. Connect two tape decks as shown in Fig. 11.
2. Turn the TAPE MONITOR switch 1 to ON.
3. Play back the recorded tape on tape deck 1 and record it
onto the tape deck 2.
4. You can monitor the tape during recording by setting the
TAPE MONITOR switch 2 to ON. In this case, setting the
TAPE MONITOR switch 2 to OFF will produce the sound
from the TAPE DECK 1.
NOTE: Duplicating and editing can be carried out very easily by using a tape
deck equipped with a PAUSE switch for the recordinq side.
sx-727
TAPE DECK 2
I
I OFF
L----O L
TAPE MONITOR SWITCH
(Must be switched ON SWITCH 2
sx-727
TAtrE
MON 2
TAPE
REC 2
F is. 10
Fis. 1 1
TAPE DECK 1TAPE DECK 2
TAPE MONITOR TAPE MONITOR
SWITCH 1 SWITCH 2
TAPE DECK 1
10
scan by [email protected] - NOT FOR RESALE

USING A MICROPHONE
1. Plug the microphone into the MIC jack.
2. Set the SELECTOR switch to MIC.
3. Adjustthe volume by slowly tuming up the VOLUME con-
trol to the right. The BASS and TREBLE controls should
normally be at FIAT.
NOTE: 1. While using the microphone, only monophonii sound is heard
f rom the lef t and right speaker systems.
2. Howling may occur if the VOLUME control is turned too high
while the microphone is close to the speakers.
ASSEMBLING A MULTI-AMP SYSTEM
USING A CARTRIDGE TAPE PLAYER
1. Set the SELECTOR switch to AUX.
2. Start the cartridge tape player.
3. Adjust the volume and tone controls as required.
A 2-way or 3-way multi-amplifier system can be assembled by
incorporating a separately available electronic crossover net-
work (Pioneer SF-500, SF-700, for example) and one or two
power amplifiers (Fig. 12).
1. Remove the plugs on the rear panel of the SX-727 (Fig. 1B).
2. connect the input terminals of the electronic crossover
network to the PRE-OUT jacks of the SX-727 .
3. connect the Low range output terminals of the electronic
crossover network to the MAIN-IN jacks of the SI*-727.
4. connect the MID range output terminals of the electronic
crossover network to the input terminals of the power
amplifier for mid-range, and the HIGH range output ter-
minals to the input terminals of the power amplifier for
high-range.
NOTE: A fine selection of high-performance electronic crossover networks,
power amplifiers and multi-amp speaker systems are available from
Pi oneer.
POWER AMPLIFIER
ELECTRONIC
CROSSOV E R
NETWOR K
sx-727
(H IGH-
RANGE)
o. o
TWE ETE R
-{{
#ll
oo
PRE
OIJT (MID-
RANGE) RANGE
(LOW-
RANG E }
WOOF ER
Fig. 12
Fis. 13
scan by [email protected] - NOT FOR RESALE