Pioneer SX.950 User Manual
A M /FM STEREO RECEIVER
KC
OPERATING INSTRUCTIONS
KU
CONTENTS
Stereo System Composition .............
SX-950 Features................................
Connection Diagram
Connections
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Antenna and Ground Connections . . .
Front Panel Facilities
How to Operate the Receiver
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2
3
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6
7
8
10
Tape Deck Operation ..............................
Adaptor Jacks for Increased Versatility .
Employing PRE OUT and
POWER IN Jacks..................................
Conditions Frequently Mistaken for
Malfunction
Specifications
STEREO SYSTEM COMPOSITION
Tape Deck
• Be sure to install reel clamps when using vertically.
• Always keep heads clean.
• Do not neglect recorded tape for long periods.
• Avoid magnetic fields.
Thick curtain shuts
out direct sunlight.
SX-950 (Keep connecting
cords as short as possible.)
Turntable
• Protect from vibrations and close dust cover whenever possible.
• Store records vertically and protect from dust and dirt.
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Speaker System
Rear and side panels of le ft
and right speakers should have
the same surroundings.
(Placing w ith rear panel against
a wall improves bass)
Install speakers so that vibra
tions are not transferred di
rectly to the floor.
(Employ stands or concreto
blocks with bookshelf type
speakers)
. . 12
. . 14
16
. . 17
. . 18
Furniture materials can improve tone
Carpet
Absorbs sound and vibrations
(Placing in fron t of speakers is also effective.
Listening position slightly to the rear of the apex of an equilateral triangle formed w ith left and right speakers.
• Do not place equipment in locations that are unlevel or subject to vibration.
• Allow for good rear panel ventilation of components; avoid humidity and dust.
• Keep equipment away from radiators or other heat sources.
2
SX-950 FEATURES
ΡΙΟΜΕΕΠ
LATEST TECHNOLOGY FRONT END
Two dual gate MOS FETs (field effect transistors), RF
amplification and a buffer amplifier between the local
oscillator and mixer stages exemplify the advanced tech
nology built into the FM front end. Together with carefully
selected circuit components, this provides outstanding per
formance in terms of sensitivity, overload resistance, image
rejection and spurious rejection. In all of its specifications,
the SX-950 FM tuner section compares favorably with the
most respected separate component type tuners.
HIGH SELECTIVITY IF STAGES
Excellent capture ratio, stable operation and sharp selec
tivity are assured by three ceramic filters in the IF stages
and 1C limiters. The filters never need realignment and
contribute to high reliability against aging and ambient
temperature variations.
QUADRATURE DETECTOR AND PLL
MPX DEMODULATOR
A balanced bridge differential amplifier performs quad
rature detection of the FM signal. Linearity is assured
throughout the frequency band, while distortion bccomcs
minimized. Clear and stable separation is provided by the
PLL (phase locked loop) multiplex circuit design.
REDUCED DISTORTION AM CIRCUIT
Careful engineering is also evident in the AM tuner circuit.
Autom atic gain control in the RF and IF stages, together
with a 3-gang variable capacitor and 1C circuitry deliver
improved image ratio, selectivity and frequency response,
plus reduced distortion.
HEAVY DUTY SPLIT POWER SUPPLY
The dual positive and negative power supply incorporates
extra large 22,000 ^F electrolytic capacitors and possesses
plenty of reserve power. Protection and muting functions
are included to both safeguard equipment and eliminate
power on-off noise.
PRECISION RIAA PHONO EQUALIZER
Deviation from the R IA A standard is performed within
±0.3dB, while the ability of the phono inputs to accept
relatively strong signal levels without distortion (200
mV rms) results in a wide dynamic range.
VERSATILE TONE CONTROLS PLUS TURN
OVER SELECTORS
Active NFB type bass and treble control circuits provide
precise and stable control without affecting the mid-range.
Turnover frequency selector switches determine the points
at which the tone controls take effect, and a convenient
tone on-off switch is also employed to allow a flat
frequency response to be obtained at any time regardless
of tone control and turnover switch settings. This is useful
for checking the effects of the phono cartridge, speakers,
listening room acoustics, etc. on the spaciousness of the
sound.
DIRECT COUPLED POWER AMPLIFIER
The power amplifier of the SX-950, is a direct-coupled,
pure complementary parrallel push pull circuit, which uses
a differential amplifier at first stage. SX-950 delivers
Continuous power ou tput of 8 5 w a t t s * per c ha n
nel, min. , at 8ohms from 2 0H e r t z to 2 0, 0 0 0
Her tz wit h no more than 0 .1 % total harmon ic
dis tort ion .
Plently of power is available for rich and stable stereo
reproduction.
IM PORTANT ADDITIONAL FEATURES
Two tape monitor circuits allow two stereo tape decks to
be used for recording, playback and tape duplication.
Microphone input on the front panel adds to versatility
and enjoyment.
The audio muting switch can be used to temporarily reduce
the volume by 20dB when changing records or tapes or for
other reasons, w ithout continually adjusting the volume
control.
Indicator lamps provide clear indication of operating mode.
TASTEFUL STYLING COMPLEMENTS HIGH
PERFORMANCE
The exquisitely designed aluminum front panel is trimmed
with solid walnut. Control functions and layout also add
to both versatility and top grade components appearance.
In comvination with high quality source components and
speaker systems, a magnificent stereophonic music system
is composed for providing rich audio enjoyment.
HIGH RELIABILITY PROTECTION CIRCUIT
In the event of malfunction, valuable semiconductors and
speakers are protected by a relay electronic protection
circuit that detects DC output voltage or impedance over
load. This circuit also functions to reduce noise during
ON-OFF operation o f the power supply.
* Measured pursant to Federal Trade Com mission’s Trade
Regulation rule on Power Output Claims for Am plifiers.
3
CONNECTION DIAGRAM
PIONCECΞΠ
OUTDOOR
FM ANTENNA
T-TYPE
FM ANTENNA
TURNTABLE
TURNTABLE
CARTRIDGE
TAPE PLAYER
AM FERRITE ANTENNA
TAPE DECK
(open-reel, cassette)
LINE
INPUT
-FT:
TAPE DECK
(Open-reel, cassette)
_
jgtt3
LINE
INPUT
LINE
OUTPUT
C4 ITX » S f tU i » «K D M C I
* 9 C <u C* SP f M ta
»·« »· c β· c-*_· ο» «er tnun
71
DOLBY NR ADAPTOR
5ö|ö]nlo|^|onioi
LINE
INPUT
LINE
OUTPUT
FM DE-EMPHASIS SWITCH
Normally, set this switch to "75μ$". Be sure to set it to
"25*is" only when listening to an FM broadcast (pre
emphasis; 25Msec.) with a D olby* system NR adaptor con
nected between the ADAPTOR OUT and ADAPTOR IN
terminals.
4 CHANNEL DISCRETE
FM ADAPTOR
AM AN TENNA
j. (Indoor or Outdoor)
_______
Λ
GND
The bridge connecting plugs between PRE OUT and
POWER IN jacks should always be left in position in
normal use. If they are disconnected or removed, no
sound w ill come from the speakers. Always be sure to
switch o ff the power supply before attempting to
remove them.
For the applications of the PRE OUT and POWER IN
jacks, please refer to the section on "EMP LO YIN G
PRE OUT AND POWER IN JACKS’* on page 16.
Γ
RIGHT
SPEAKER SYSTEMS A
—
LEFT
__
*. Γ*"·7 *· y.~r-
Γ
I ^
RIGHT LEFT
SPEAKER SYSTEMS B
- _
·;· · *
I . . · · Ü
iV - · : i
1 ■ I
1 j
CONVENIENCE OUTLETS
Unswitched: Less frequently used components, which do
(200W max.)
Switched:
(100W max.)
I
S
not require coupled power, can be plugged
into either of these outlets.
A frequently used component (turntable, tape
deck, etc.) can be plugged into this outlet.
By leaving the power switch of that compo
nent in the ON position, power supply to the
switch operation.
R|GHT LEFT
•The word '‘ Dolby" is a trademark of Dolby Laboratories Inc.
1
____
i
SPEAKER SYSTEMS C
5
CONNECTIONS
SPEAKER SYSTEM CONNECTION
The receiver is equipped with three sets o f speaker
terminals (A, B, and C). Use the A terminals for
the speakers in normal use.
As shown in Fig. 1, the upper socket (red) is the
positive ( + ) terminal, and the lower (black) is the
negative (-) terminal in each case.
In the same way, the speakers have positive and
negative polarity ( + and - terminals). Be sure to
connect terminals of the same polarity together
(+ to +, and - to -).
NO TE :
When tw o sets o f speaker systems are being used at the
same time (A + B, A + C, or B + C), please ensure that
the im pedance of each speaker system is not less than
8Ω. I f speaker systems with impedances below 8Ω are
used, the receiver’s protection circuit may operate to
prevent sound being produced.
SPEAKER OUTPUT TERM INALS
RIGHT CHANNEL
LEFT CHANNEL
Speaker lead-wire
t— 1 Om m —
Remove insulation
from wire end.
Twist stranded wire.
Fig. 2
TURNTABLE CONNECTIONS
The receiver is fitted with two sets of input jacks,
PHONO 1 and PHONO 2, enabling two turntables
fitted with magnetic phono cartridges to be con
nected.
• Connections between the turntable OUTPUT
terminals and the receiver PHONO input jacks
should be made as shown in Fig. 3, taking care
not to confuse L & R channels. If, as in Fig. 3,
the turntable is fitted with a ground lead or plug,
this should be connected to the receiver GND
terminal.
NO T ES:
1. When using a turntable fitted with two tonearms, the
output leads fo r each o f the tonearms should be con
nected to the respective PHO NO input jacks (1 and 2).
2. When using a turntable fitted with a moving co il (M C)
phono cartridge, it is essential to use a special MC
matching transformer or head am plifier.
RIGHT SPEAKER
SYSTEM
LEFT SPEAKER
SYSTEM
Fig. 1
Speaker Lead Wire Preparation & Connection (Fig. 2)
1. Strip about 10mm (3/8 inch) of the insulation
from the end of the speaker lead wire.
2. If the conductor is stranded, twist the strands
together so they do not come loose.
3. Depress the black colored lever of the speaker
terminal and insert the speaker minus lead wire
into the hole above the lever. Return the lever
to its former position.
4. Push up the red colored lever of the speaker
terminal and insert the speaker plus lead wire
into the hole below the lever. Return the lever
to its former position.
6
TURNTABLE
GROUND WIRE
CARTRIDG E
TAPE PLAYER
Fig. 3
USE OF THE AU X INPUT JACKS
These are a set of spare input jacks, which can be
connected to a cartridge tape player, television
sound tuner, or other signal source. The upper of
the two jacks is the L (left) channel, and the lower
is the R (right) channel (Fig. 3).
ANTENNA AND GROUND CONNECTIONS
PIONEER
FM ANTENN A CONNECTIONS
For the best results you should use an outdoor-
type FM antenna, although the simple T-type
antenna supplied with the receiver may be used
satisfactorily in areas of high signal strength (for
instance, those very near to the FM station, or in
a house of all-wooden construction).
FM Outdoor Antenna
Normally, install antenna as follows.
• Connect antenna feeder wire to the 300Ω
antenna terminals of the SX-950 as shown in
Fig. 4.
• While listening to broadcasts, as described on
page 10, install the antenna and determine the
best location for optimum reception. Secure
antenna firmly.
T-type Antenna
The accompanying T-type antenna can be used
where FM signals are strong. Connect it to the
antenna terminals as shown in Fig. 6. While
listening to an FM station, spread the two arms
horizontally and determine its best orientation.
Secure it to a wall or ceiling. See FM Reception
on page 10.
NO TE:
Urban areas with heavy traffic, industrial zones, or loca
tions near high voltage pow er lines may experience
interference even with a special F M antenna. In such cases
seek the advice o f an audio dealer. It may be advisable
to em ploy 75Ω coaxial cable to connect the antenna to
the SX -950 75Ω U N BA L terminal.
75Ω FM
coaxial cable
terminal
Strip the coaxial cable as shown in (A)
Loosen the screws and insert the cable (B)
Tighten all screws for a firm connection (C)
Fig. 5
Normally, position the ferrite bar antenna (Fig. 7)
for best reception while listening to an AM station
as described on page 10.
AM Indoor Antenna
If reception is difficult with the bar antenna, an
indoor AM antenna can be erected with vinyl
insulated wire as shown in Fig. 6.
AM Outdoor Antenna
For optimum AM reception, an outdoor AM
antenna using vinyl insulated wire can be erected
as shown in Fig. 4.
AM ferrite bar antenna
Fig. 7
GROUND
For maximum safety and to eliminate noise, con
nect the GND terminal to an earth ground if at
all possible. See Fig. 4.
7
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