Pioneer SX-980 User manual

AM/FM STEREO RECEIVER
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_OPERATING INSTRUCTIONS
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Before turning on the power, please confirm the line
voltage setting indicated on the rear of your unit
corresponds to the supply voltage in your area; if not,
change the setting as described in LINE VOLTAGE
SELECTOR SWITCH on page 19.
CONTENTS
Features: eis n 5 5 ea ted, ee a alee eg OS A ae 2
Installation Cautions ................0.000. 3
Connection Diagram ...............00000. 4
Connections
Antenna and Ground Connections ............ 8
Front Panel Facilities
Prior to Switching Power On... ..........04. 13
FM Reception ........... 2.000000 0c eee 13
AM Reception ............0. 0000000 e eae 13
Playing Records .................0200005 14
Using the Microphone .................005 14
Using the AUX jacks ................0000. 14
Effective Operation... .........00 00000 uae 15
Tape Deck Operations ................0005 16
Using PREAMP OUT and POWER AMP IN Jacks .. 17
Specifications
Line Voltage Selector Switch
Conditions Frequently Mistaken for Malfunction . .
peter
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FEATURES
Power Amplifier for a Continuous Power Output
of 80 Watts Per Channel and for Ultra-Stable
Sound Reproduction
@ The adoption of a single-stage differential amplifier with
low-noise dua! transistors, pre-driver stage a current
mirror load and an SEPP circuit provides a bumper
power output of 80 watts + 80 watts( continuous
power output of 80 watts” per channel,
min., at 8 ohms from 20 Hertz to 20,000
Hertz with no more than 0.05% total har-
monic distortion) which is extremely stable. These
features also guarantee a stable operation at all times
from low outputs to high outputs.
@ The power amplifier is configured as a DC power ampli-
fier with the capacitors removed from the NFB circuit
for a flat gain response all the way from the lowest of
the low frequencies up to the audio frequencies. At the
same time, the design is engineered for low distortion
with the incorporation of newly developed power
transistors.
@ The large-sized transformer with its superb regulation
employ two 18,000uF large-capacity electrolytic capaci-
tors in the power supply and permit high sound quality
even at lowest frequencies.
IC-Based FM Tuner with High Selectivity, High S/N
and Low Distortion
® The FM front end incorporates a 1-stage RF circuit that
employs a 4-gang tuning capacitor and a dual-gate
MOS FET for high gain and low noise. This config-
uration excels in ridding the sound of undesirable
interference for impressive statistics: 1.7uV (IHF)
sensitivity, more than 100dB spurious response ratio
and more than 90dB image response ratio.
@ The FM IF amplifier combines three dual-element phase-
linear ceramic filters with two IC’s which contain
quadrature detectors for a high selectivity (80dB) and a
low distortion (MONO: 0.1% at 1kHz).
@ The stereo demodulator employs an NFB-type PLL MPX
IC with a automatic pilot canceller which automatically
cancels out the pilot signals without reducing the
high-end frequency. This means that the leak carrier
level is amply suppressed for a tip-top separation and flat
frequency response in the reproduction frequency band.
AM Tuner Includes Newly Developed !C
The tuned AM RF amplifier circuit incorporates a
newly developed high-sensitivity, low-distortion IC and
2-gang variable capacitor. These contribute to enhanced
imaging and RF interference rejection capabilities. Since
the optimum AGC voltage is supplied to each section,
2
stable reception can be obtained with low spurious inter-
ference and distortion even in high field strength areas.
Precise Record Equalization
e@ A balanced power supply is used in the equalizer ampli-
fier to obtain a maximum allowable input of 200mVrms
(1kHz). Low distortion record playback can thus be
enjoyed even with high output phono cartridges and
music sources containing large peak signals.
@ The equalizer elements which are designed to produce
the RIAA characteristics use high-precision parts to keep
the equalizer deviation between 20Hz — 20kHz down to
+0.2dB for faithful sound reproduction from records.
Other Features
TURNOVER switches: These switches yield variations in
the curves of the tone controls when they are operated in
conjunction with the other bass and treble tone controls.
One is used for the bass and the other for the treble,
thereby allowing plenty of variation in tone control adjust-
ment.
Highly reliable protection circuitry: In order to protect
the speakers and the power transistors, this receiver features
a newly developed protection IC as well as a special muting
circuit that cuts out the noise produced by the on/off
operation of the power switch. Needless to say, these are
very dependable and stable protection circuits. In addition,
there is an inrush current suppressor circuit which sup-
presses surges of current when the power is switched on.
FM 25us switch: The receiver’s front panel is equipped
with a de-emphasis selector switch which is useful when the
receiver is tuned into an FM Dolby station. This facilitates
operation when the receiver is set up for the reception of
an FM Dolby broadcast.
TAPE DUPLICATE switch: This switch allows you to use
two tape decks to edit or duplicate material recorded on
one tape to another. Duplication from an open-reel deck to
a cassette deck, for example, can be performed in a
one-touch operation.
Power meters: Each channel has its own power meter
(0.01W — 160W display range) with a logarithmic com-
pression scale. These meters feature a fast response speed,
and they enable you to read out the power values at an
8-ohm impedance across a power band stretching from
0.01W up to the maximum output of the receiver.
6kHz (high) and 15Hz (low) filter switches: Featured are
a filter for GdB/octave attenuation at frequencies below
15Hz in order to eliminate ultra-low-range noise generated
by warps in the records, and also a 6kHz (6dB/oct attenu-
ation) filter that eliminates high-range noise such as that
produced by scratches on the records and hiss.
*Measured pursuant to Federal Trade Commission's Trade
Regulation rule on Power Output Claims for Amplifiers.

ee FONE KT
-- FOR USE IN UNITED KINGDOM OR AUSTRALIA
CAUTION 240V nected to the terminal which is marked with the |
Mains
supply
voltage
is
factory
adjusted
at
240
letter
L
or
coloured
brown
or
red.
volts. The AC Outlets of this apparatus have been re-
moved from this apparatus in order to comply
WARNING with U.K. Safety Regulation. Ensure that your
THIS APPARATUS MUST BE EARTHED. equipment is connected correctly—if you are in
IMPORTANT doubt, consult a qualified electrician.
The wires in this mains lead are coloured in ac- Do not unscrew the bottom plate and cabinet.
: ; No user serviceable parts inside.
d th the foll de: ; :
ree ht Nae. ia sa Always disconnect all the equipment from the
; mains supply when disconnecting the signal
Blue: Neutral leads. The Power cord should be connected last,
make sure that the Power switch is OFF. Be sure
the appliance connector is fully inserted into the
AC inlet.
Unplug the set from the wall socket when it is
not to be used for an extended period of time.
Brown: Live
As the colours of the wires in the mains lead of
this apparatus may not correspond with the
coloured markings identifying the terminals in
your plug proceed as follows.
The wire which is coloured green-and-yellow
must be connected to the terminal in the plug FOR YOUR SAFETY
which is marked by the letter E or by the safety 1. Insert this plug only into effectively earthed
earth symbol ~ or coloured green or green-and- three-pin plug-socket outlet.
yellow. 2.If any doubt exists regarding the earthing,
The
wire
which
is
coloured
blue
must
be
con-
consult
a
qualified
electrician.
nected
to
the
terminal
which
is
marked
with
the
3.
Extension
cords,
if
used,
must
be
three-core
letter
N or
coloured
blue
or
black.
correctly
wired.
The wire which is coloured brown must be con-
INSTALLATION CAUTIONS
To
ensure
the
best
sound
quality
and
trouble-free
operation,
avoid
setting
up
the
SX-980
in
any
of
the
locations
described
below.
Location liable to downgrade performance
Resulting trouble
and result in breakdowns 9
1. Locations exposed to direct sunlight, or near heaters. 1. External heat causes the performance of the circuit parts to
deteriorate, and operation becomes unstable.
2. Locations with poor ventilation, or with high humidity or 2. Cause of faulty contact in input/output terminals, and rust.
moisture contents, or dusty locations. High humidity and a high moisture content cause deterioration
in insulation. There is also the danger of current leakage and
heat generation in the circuit parts. Dust or grease in the rotat-
ing parts causes the parts to deteriorate.
3. Locations susceptible to vibration. 3. These locations affect the precision parts adversely.
4. Locations where an AM radio or TV set is being used simulta- 4. Mutual interference can occur from the oscillator circuits used
neously. in these products.
Don’t put anything on the top of the receiver because high power receiver will produce a lot of heat. Also leave sufficient
around the receiver for adequate ventilation.
SL mae ee Na Ta a a |
3

CONNECTION DIAGRAM
FM outdoor antenna T-type FM antenna
AM outdoor antenna
300
ohm
feeder
|
|
= ee be ee
75 ohm connector plug (
Ao)
Turntable
1
Ground
|
Ducne
Se
iane
wa
hee
(PHONO
1)
©)
F
5
r ©) |§ CHOHCHES
4, ese elles) °
© KO) | RF FAGHGHO
Ground
I
Output |
(PHONO 2)
'
Cartridge tape
Xx
Tape deck 1
(TAPE 1)

Pe Pe ee
PRE/POWER AMP LINE VOLTAGE SELECTOR SWITCH
The bridge connecting plugs between PREAMP OUT Refer to page 19.
and POWER AMP IN jacks should always be left in
Position in normal use. If they are disconnected or
removed no sound will come from the speakers.
Always be sure to switch off the power supply before AC INLET
attempting to remove them. Refer to the section Plug the AC power cord into this socket.
“USING THE PREAMP OUT AND POWER AMP IN
JACKS” on page 17.
AC INLET
é lO! MMU ISN
a@p)p
68 ry
Recording/Play
back
cord
= =
“DiNcord)
~~
~~~
™~
Left
Right
Speaker systems
Output (SPEAKERS A)
Tape deck
(TAPE 2)
Left Right
Speaker systems
(SPEAKERS B)
3
|

CONNECTIONS
PRECAUTIONS
e Set the POWER switch to ON only when you
have completed all the connections of the stereo
system. Always set this switch to its bottom
position (OFF) if you want to change the con-
nections.
e All the receiver’s jacks are aligned for easy
connection in two rows: the top row for L (left
channel) and the bottom row for R (right chan-
nel). Always connect L to L and R to R with the
audio component output and input jacks.
@ Make sure that the connections are secure.
Improper connections can generate noise and
cause the sound to be cut off.
SPEAKER SYSTEMS
The receiver is provided with two sets of SPEAK-
ERS output terminals. Use the A set when
connecting only one set of speakers.
Viewed from the front, the R (right channel)
SPEAKERS terminals are on the right and the
L (left channel) SPEAKERS terminals are on the
left. Connect the left channel speaker to the L
terminals and the right channel speaker to the R
terminals. The red L and R SPEAKERS terminals
have a plus polarity and the black terminals have a
minus polarity just like the speaker systems
themselves. When connecting, always connect
minus to minus and plus to plus (Fig. 1).
RIGHT SPEAKER LEFT SPEAKER
SYSTEM SYSTEM .
Fig. 1
NOTE:
If you want to use two sets of speaker systems, make sure
that the impedance of each system is 8 ohms or more.
If the impedance is less than 8 ohms, the protective
circuitry will be actuated when the volume is turned up
and you will not be able to enjoy proper stereo perform-
ance,
Connecting the speaker lead wires to
the SPEAKERS terminals (Fig. 2)
1. Strip about 10mm of the insulation from the
end of the speaker lead wires. If the conductor is
stranded, twist the strands together so that they
do not come into contact with other terminals.
2. Depress the terminal buttons and insert the lead
wires into the terminal holes.
8. Release the buttons and check that the lead
wires are secure.
SPEAKERS terminals
Speaker
system
Fig. 2
NOTES:
1. The high output power of this receiver requires that
the speaker lead wires have an ample current carrying
capacity. Use wires with a high capacity and connect
them securely. If you use low capacity wires and do
not connect them properly, the reproduced sound will
be adversely affected and heat generation or short
circuits may be caused.
2. This receiver delivers a high output power and so make
sure that you use speakers with a high allowable input.
TURNTABLE CONNECTIONS
Connect the output cords of a turntable using a
moving magnet (MM) cartridge to the PHONO 1
input jacks. Connect the ground lead of the turn-
table to the GND terminal on the receiver (Fig. 3).
NOTES:
e In addition to turntables using MM cartridges, there are
others that employ induced magnet (IM), moving iron
(MI) and high-output moving coil (MC) cartridges.
If you intend to use a turntable with a low-output MC
cartridge, always provide a special MC cartridge boost-
ing transformer or head amplifier.

e Connect your second turntable to the PHONO 2 input
Jacks.
e If your turntable is fitted with two tonearms, the
output cords for each of the tonearms should be
connected to the PHONO I and PHONO 2 input jacks.
Fig. 3
TAPE DECK CONNECTIONS
The receiver is provided with two sets of recording
(TAPE REC) output jacks and two sets of play-
back (TAPE PLAY) input jacks. Connect each of
the jacks in the following way using the connecting
cords which come with the tape deck. The upper
row of jacks is for the left channel (L) and the
lower row for the right channel (R) (Fig. 4).
Connections for recording
Connect the recording input jacks (LINE INPUT)
on the tape deck to the TAPE 1 REC jacks on the
receiver.
Connections for playback
Connect the playback output jacks (LINE OUT-
PUT) on the tape deck to the TAPE 1 PLAY jacks
on the receiver.
NOTE:
Connect your second tape deck to the TAPE 2 jacks
(REC, PLAY).
PIONEER
SX-980 Tape deck 1
Recording connections
Connections using the recording/playback
connector (DIN cord)
If your tape deck is equipped with a recording/
playback connector (DIN-type), use the optional
recording/playback cord to connect this connector
with the TAPE 2 REC/PLAY jack on the receiver.
This means that the deck and receiver are now set
up for both recording and playback (Fig. 5).
In such cases, do not connect pin cords (ordinary
pin plug cords) to the TAPE 2 REC and PLAY
jacks.
REC/PLAY jack
REC/PLAY
cord
TAPE 2:
REC PLAY |
®
Tape deck 2
ar
Fig, 5

ANTENNA AND GROUND CONNECTIONS
FM ANTENNA CONNECTIONS
The signals transmitted by an FM broadcasting
station inevitably become weak when received
behind mountains, between buildings and inside
reinforced concrete structures. In weak-signal
areas, signals which are reflected off mountains
and other obstacles in their path may be picked
up by the antenna, which causes a multipath effect.
This adversely affects the sound received. This is
why it is necessary to choose an antenna and an
installation location which are best suited to cope
with the ambient conditions and the strength of
the signals.
Special FM antennas
It is recommended that you use a special FM
antenna in order to obtain input signals which will
allow your receiver to display its capabilities to the
full.
@ When installing your antenna, refer to the
instructions in ‘FM RECEPTION’ on page 13
and determine in which direction the antenna
should point for the best reception, all the while
listening to a broadcast to check the reception.
Mount the antenna securely.
@ In accordance with the application of the
antenna, use a 75-ohm coaxial cable or a 300-
ohm feeder to connect the antenna to the
receiver.
75-ohm coaxial cable: As shown in Fig. 6, connect
the cable to the 752 UNBAL terminal of the
receiver. This cable is used in locations near roads
with a great deal of traffic, and near overhead
high-tension power lines which generate a lot of
noise. It is also used when the antenna and the
receiver are far apart.
300-ohm feeder: As shown in Fig.7, connect the
feeder to the 83002 BAL terminals. Use it when
there is little external noise and when the antenna
and the receiver are not far apart.
NOTE:
Consult your nearest PIONEER dealer concerning the
special FM antenna and the 75-ohm coaxial cable.
T-type antenna
When the broadcasting station is located nearby
and when the FM signals are strong in wooden
frame buildings and others, you can use the
accessory T-type antenna (Fig.7).
As shown in Fig. 7 connect the end of the T-type
antenna to the 300-ohm terminal. Spread the two
arms of the antenna horizontally and while listen-
ing to an FM station, rotate the antenna through
180 degrees and position it for the best reception.
Tape the antenna to a wall or ceiling.
FM outdoor antenna
$X-980
Antenna
terminals
FM outdoor antenna
T-type antenna
300-ohm
feeder

AM ANTENNA CONNECTION
Move the AM bar antenna on the rear panel of the
receiver and find the best reception position, all
the while following the instructions outlined on
page 13 under ‘AM RECEPTION.’
Fig. 8
NOTES:
e The AM bar antenna on the receiver’s rear panel
displays directivity and so some stations may be poorly
received. In such cases, change the installation direc-
tion of the receiver.
e If the receiver is installed right up against a wall in a
reinforced concrete building, the reception may be
adversely affected. Therefore, it is a good idea to erect
an indoor AM antenna.
e If you still cannot obtain good reception even
by moving the AM bar antenna, erect an indoor
AM antenna with a vinyl insulated wire (about
5-6 meters long). As shown in Fig.9, connect
the lead wire to the AM antenna terminal, and
tape it to the wall or ceiling.
e If you live in an area where the reception is poor
even if you erect an indoor AM antenna, use a
tree to erect an outdoor AM antenna with a
vinyl insulated wire (Fig. 9).
AM outdoor antenna
Indoor antenna
(vinyl insulated wire)
SX-980
Antenna
terminals
Fig. 9
PIONEER
GROUNDING
As shown in Figs.6 & 7, connect a ground wire to
the GND terminal on the receiver for maximum
safety and noise reduction. Never make this con-
nection near gas pipes and other potentially
dangerous locations.
FM ANTENNA LOCATION
It is important to choose with care the locations
where you will install your FM antenna for the
stable reception of the signals from FM broadcast-
ing stations and for superior sound reproduction.
Bear in mind the following points and determine
the optimum location (height and direction).
1. The ideal place for the antenna is somewhere
where it can pick up the signals transmitted
from the FM broadcasting station antenna
directly. Locations where these signals cannot be
picked up directly because of obstacles in their
path or because the receiver’s antenna is located
in a low building surounded by higher buildings,
are affected by the multipath effect caused
when signals are reflected off these obstacles
or buildings. In such places, the sound will be
distorted and the separation between the left
and right channels will deteriorate.
Choose a height and a direction for the antenna
where the multipath effect will be minimal.
2. Erect your antenna as far away as possible from
roads so that there is no interference from auto-
mobile ignition noise, and also from high-tension
power lines and neon signs.
38. Keep your antenna at least two meters away
from sheet-metal roofs, concrete buildings and
TV antennas.
Station direction
More than 4 meters
(15 ft.) above ground
Feeder or cable
should not directly
contact other structures.
Keep cabling
as short as possible
Select location away
from traffic noise
and with clear line of sight

-
|
FRONT PANEL FACILITIES
POWER SWITCH POWER METERS
Flip this switch to the ON position to supply power to the These power meters allow you to read out the rated
stereo receiver. There will be a short delay when it is set power level when speakers with a nominal impedance of
to
ON,
because
the
muting
circuit
has
been
actuated
to
8
ohms
are
connected
to
the
receiver’s
speaker
terminals.
suppress the unpleasant noise that is sometimes generated NOTE:
when
the
power
is
switched
on
and
off.
These
values
are
related
to
the
impedance
of
the
speakers and they vary according to the frequency.
In order to find out the exact output level, connect an
PHONES JACK 8-ohm dummy load instead of the speakers.
Plug the headphones into this jack when you want to
listen through your stereo headphones.
Release both SPEAKERS buttons if you want to
listen to the sound through your headphones only. (This
means that both buttons will be released).
FUNCTION INDICATOR
MEMORY MARKERS
These are very convenient for frequent tuning in to the
same broadcasting station.
TREBLE wee
i TRROven
TURNOVER
Lich
F
OLUME,
2
JPL
5
L
BOOHz
é
4 2
2
Y
pahte
:
L
3
3
STERE:
la
a
a
ON
S
,,
ON ON
ON
MONO
ON
LEFT
RuGHT
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|
SPEAKERS BUTTONS:
Press the button corresponding to the speakers connected
to the SPEAKERS terminals (A or B) on the rear panel.
You can press both of these buttons to listen to sound
from two pairs of speaker systems at the same time.
MUTING SWITCH—————----
Set this switch to the —20dB position to attenuate the
audio output indicated by the VOLUME control by 20dB.
There is no need to adjust the VOLUME control if you
use this switch when turning down the audio output
temporarily and when changing over records or tapes.
For further details, refer to page 15.
BALANCE CONTROL
Use this control to balance the volume of the left and
right channels. First, however, set the MODE switch to ~VOLUME CONTROL
MONO,
and
adjust
so
that
the
sound
appears
to
come
Use
this
control
to
adjust
the
output
level
to
the
speakers
from
somewhere
exactly
between
the
two
speakers.
If
the
and
headphones.
Turn it
clockwise
to
increase
the
output
sound
appears
to
be
jouder
on
the
right,
it
means
that
the
ievel.
No
sound
will
be
heard
if
you
set
it
to
o.
The
scale
volume
of
the
right
channel
is
higher.
Turn
the
BALANCE
is
graduated
in
dB
which
indicate
the
attenuation
when
control
to
the
left
and
adjust.
Conversely,
if
the
sound
the
maximum
output
level
is
OdB.
appears to be louder on the left, it means that the
volume of the left channel is higher. Therefore, turn the
BALANCE control to the right and adjust. After adjust-
ing, return the MODE switch to STEREO.
10

[Continued next page |
ee (ONC CT.
TONE SWITCH
Set this switch to ON when adjusting the BASS and
TREBLE controls. In the OFF position, it causes the
amplifier to operate with a flat frequency response.
rFUNCTION BUTTONS
|
Ee
Press the function button which corresponds to the pro-
gram source. Turn the VOLUME control down first
before selecting a different function button while the
sound from one program source is being reproduced.
FM.......... Press this button for FM broadcasts.
The FM STEREO indicator lights
up when the receiver is tuned into an
FM stereo broadcast. The sound is
automatically received monophonical-
ly during FM monophonic broadcasts.
TREBLE ee
TURNOVER
BASS AND TREBLE CONTROLS—
Use these controls to adjust the bass and the treble.
If you set the TONE switch to ON and turn the BASS
control to the right from its center position, you will be
able to emphasize the sound in a frequency range which is
lower than that selected by the BASS TURNOVER
switch. Conversely, turning this control from the center
position to the left will attenuate the sound.
You can use the TREBLE control to adjust the sound ina
frequency higher than that selected by the TREBLE
TURNOVER switch. For further details, refer to
“TURNOVER SWITCHES” on page 15.
BASS TURNOVER SWITCH
Use this switch to change over the frequency at which the
sound adjustment with the BASS control is starting to
take effect. Select 200Hz or 400Hz in accordance with
the characteristics of your listening room and of your
speakers, and with your general preference.
Press this button for AM broadcasts.
Press this button when listening to an
audio component connected to the
AUX input jacks.
Press this button when playing a
record on the turntable connected to
the PHONO 2 jacks, or when using a
microphone which you have plugged
into the MIC jack.
Press this button when playing a
record on the turntable connected to
the PHONO 1 jacks.
PHONO 2/MIC..
PHONO 1
NOTES:
1.
Unplug
the
microphone
from
the
MIC
jack
when
you
do
not
intend
to
use
the
microphone
otherwise
you
will
not
be
able
to
use
the
PHONO
2
jacks.
2. Only one function button should be pressed at a
time.
MOME LOUDNESS BALANCE
FB.
for
= 38
QPIONEER STEREO RECEIVER SX-SBO
TAPE MONITOR SWITCHES (1, 2)
Set switch 1 to ON with a tape deck which is connected
to the TAPE 1 jacks (REC and PLAY) when you want to
monitor the playback or recording of a tape. The tape on
a deck which is connected to the TAPE 2 jacks (REC and
PLAY) can be similarly monitored by setting switch 2 to
ON. For further details, refer to “TAPE DECK OPERA-
TIONS” on page 16.
NOTE:
Set these switches to the upper (off) position when
listening to records or a broadcast.
L_TREBLE TURNOVER SWITCH
Use this switch to change over the frequency at which the
sound adjustment with the TREBLE control is starting to
take effect. Select 2.5kHz or 5kHz in accordance with
the characteristics of your listening room and of your
speakers, and with your general preference.
11

TUNING METER
When tuning in to an FM station, the optimum reception
position is indicated when the meter pointer deflects to
dead center. Check that the SIGNAL meter pointer has i
deflected as far to the right as possible.
SIGNAL METER
When tuning in to an AM or FM station, the optimum
reception position is indicated by the maximum deflec-
tion of the meter pointer to the right.
FM MUTING BUTTON
ON (released position) .. .
Release this button to sup-
press unpleasant inter-station
noise when tuning between
FM stations.
Depress this button to pick
up weak stations.
OFF (depressed position) .
STEREO INDICATOR
This indicator lights up when the receiver is tuned to}
receive a stereo broadcast.
“FILTER BUTTONS |
15Hz .. When this button is pressed, a 6dB/oct attenua-;
tion can be provided for frequencies below
15Hz. This means that you can cancel out noise
in the ultra-low frequencies which is generated
by low-pitched rumble from a turntable and
other forms of distortion. Although this noise
cannot be heard, it can generate intermodula-|
tion distortion and damage the speakers. H
|
6kHz .. Press this button to provide a 6dB/oct attenua-
tion at frequencies above 6kHz. Set it to this
position when you find high-frequency noise, |
such as that from scratched records, unpleasant. }
heeercmenre rere ae
FM 25us BUTTON
Press this button when listening to a Dolby* FM broad-
cast; otherwise keep this button at the released position.
For further details, refer to page 15.
TUNING KNOB
pusucare MONT,
Vou
Pay 44
3a, 1
20. a
STERF a
ONO f6; FST -
= o
08
a STEREO RECEIVER SX-9B0
MIC JACK
Plug your microphone into this jack.
The microphone signals are reproduced in mono through
the left and right speakers.
NOTE:
A high impedance (approx. 50 kilohms) dynamic type
microphone with a standard plug can be connected to
this jack.
Use this to tune in to broadcasting stations.
Select the station and tune for optimum reception by
observing the SIGNAL meter for AM stations and both
the SIGNAL and TUNING meters for FM stations.
r—TAPE—,
MODE LOUDNESS: 3% ANCE
Gt
i
LOUDNESS SWITCH
Set this switch to ON when listening at a low volume.
The frequency response of the human ear varies according
to the listening volume, and setting this switch to the ON
position compensates for hearing response by emphasizing
the bass and treble.
“~MODE SWITCH
Use this switch for selecting mono or stereo performances.
STEREO: Set to this position for normal stereo opera-
tion.
MONO: When set to this position, the left and right
channel signals will be mixed and reproduced
monophonically from both speaker systems.
-——- TAPE DUPLICATE SWITCH
Set this switch to ON when you want to duplicate or edit
a pre-recorded tape using two tape decks. For further
details, refer to “TAPE DECK OPERATIONS” on page
16.
12 * The word “Dolby” is a trademark of Dolby Laboratories Inc.
}
:
]

a a aN ES 6) AKC Te
FM RECEPTION
P
P
RIOR TO SWITCHING
OWER ON
Before switching the power on, set the various controls as
fol
1.
2.
lows:
Set the two FILTER buttons to the released
positions.
Press the SPEAKERS button that corresponds
to the speaker system which is connected to
the SPEAKERS terminals on the rear panel.
. Set the FM 25us button to the released posi-
tion.
. Set the FM MUTING button to the released
position (ON).
. Set the VOLUME control to the © position.
. Set the BALANCE control to the center posi-
tion.
. Set the MODE switch to STEREO.
. Set the TAPE MONITOR switches to the upper
positions (OFF).
. Set the DUPLICATE switch to the upper posi-
tion (OFF).
. Set the TONE switch to OFF.
. Set the MUTING switch to the upper position
(OFF).
PROTECTION CIRCUIT
For some 6 to 10 seconds after the receiver is
switched ON, no sound will be heard. This is
due to the operation of protection circuits
which are designed to safeguard transistors
and speakers from possible damage due
chiefly to switching transients, etc. Should |
the receiver remain silent for considerably
longer than this, switch off and check the
Speaker system connections. Should the
receiver suddenly go silent while you are
listening to it, and a continuous series of
“clicks” can be heard from relay contacts
opening and closing within the receiver, this
can be an indication of a short circuit in the
speaker system connections. Switch off, and
re-check the speaker system impedances, etc.
The protection circuit re-sets itself automat-
ically, so that normal operation is resumed as
soon as the fault is corrected.
A
2.
3.
Depress the FM function button.
Slightly turn the VOLUME control clockwise
direction to obtain the sound.
Select the broadcasting station with the tuning
knob. Adjust so that the signal meter pointer
deflects as far to the right as possible and the
tuning meter pointer is centered, as indicated
in Fig. 10.
Press the FM MUTING button if the signals
from the station are weak.
If the program is being broadcast in stereo, the
STEREO indicator will come on.
. Adjust the volume with the VOLUME control.
. To adjust the tone, first set the TONE switch to
ON, and then adjust the BASS and TREBLE
controls for the preferred bass and treble levels.
Fig. 10
AM RECEPTION
ray
. Depress the AM function button.
. Slightly turn the VOLUME control clockwise
direction to obtain the sound.
. Turn the tuning knob to select a station. The
best reception is obtained when the signal
meter pointer deflects to the extreme right
(see Fig. 11).
4, Adjust the volume with the VOLUME control.
5. To adjust the tone, first set the TONE switch to
ON, and then adjust the BASS and TREBLE
controls for the preferred bass and treble levels.
Fig. 11
NOTE:
If, when listening to either an FM or AM broadcast, your
listening pleasure is seriously affected by poor sensitivity
or strong interference, refer to the section “ANTENNA
AND GROUND CONNECTIONS” on page 8, and make
any necessary changes.
13

PLAYING RECORDS
1. If your turntable is connected to the PHONO 1
input jacks, depress the PHONO 1 function
button. If it is connected to the PHONO 2 input
jacks, depress the PHONO 2 function button.
2. Operate the turntable to play the record.
8. Adjust. the volume with the VOLUME control.
4. To adjust the tone, first set the TONE switch to
ON, and then adjust the BASS and TREBLE
controls for the preferred bass and treble levels.
Precautions when playing records
e Lower the stylus gently onto the surface of the
record. It is a good idea to set the MUTING
switch to —20dB or to turn the volume down
when lowering the stylus onto the record.
@ Depress the 15Hz button if there is a great deal
of noise or if the speaker cone paper is seen to
be moving despite the fact that you cannot hear
the sound during a performance.
e Do not cause the turntable to vibrate while a
record is being played since this will cause the
stylus to jump and scratch the record. Do not
turn off the power if the stylus is still tracing
grooves on the record.
USING THE MICROPHONE
1. Connect the microphone to the MIC jack.
2. Depress the PHONO 2/MIC function button.
3. Adjust the sound level by turning the VOLUME
contro! gradually to the right.
NOTES:
1. Under certain conditions, microphones are liable to
give rise to howl or feedback noise. Take care not to
raise the volume too much when the microphone is
close to the speaker systems or in a room with a great
deal of resonance. It is a good idea to set the BASS
and TREBLE controls to their center positions or
switch the TONE switch to the OFF position.
2. You cannot use the microphone to perform mixing
operations with other program sources.
3. You should unplug the microphone jack when not
using the microphone, otherwise you cannot use the
turntable connected to PHONO 2 jacks.
4. You should use high impedance (approx. 50 kilohms)
microphones of the dynamic type, with standard 6mm
diameter phones plug.
14
Microphone
Fig. 12
USING THE AUX JACKS
You can connect an 8-track cartridge tape player,
TV tuner, second tuner or tape deck playback
output to these jacks. (See Fig. 13).
PROCEED AS FOLLOWS:
1. Depress the AUX function button.
2. Operate the audio component which you have
connected to the AUX jacks.
3. Adjust the volume with the VOLUME control.
4. To adjust the tone, first set the TONE switch to
ON, and then adjust the BASS and TREBLE
controls for the preferred bass and treble levels.
Cartridge tape
AUX input jack

EFFECTIVE OPERATION
TURNOVER SWITCHES
As shown in Fig. 14, the receiver adopts a tone
control system that combines the BASS and
TREBLE controls with two TURNOVER switches
which are used to select the frequency. Select the
frequency with the TURNOVER switches and then
enhance or attenuate the sound in the lower (or
higher) frequencies with the BASS (or TREBLE)
controls.
oo — TREBLE
TURNOVER Base fe TURNOVER
4Q0Hz Reig TONE eta 2.5kHz
2O0Hz SkHz
2 2 2 2
Ft 3 OFF 3 3
a a ON a a
be 5 S 5
eS = ar
Fig. 14
For instance, if the BASS TURNOVER switch is
set to 400Hz (see Fig. 15), the bass covers a wide
frequency spectrum and can be enhanced (or
reduced) with large gain per step of the BASS
control. For this reason, the reproduced sound
sometimes seems unnatural depending on the
program source, but this can be remedied by
setting the switch to 200Hz.
H ba,
‘ ibe pee
' | BASS TURNOVER TREBLE TURNOVE
a 25kHzZ
LEVEL (dB)
10 100 200 400 1“ 2.5m Sk 10% 100%
FREQUENCY (Hz) A
Fig. 15
VOLUME CONTROL AND MUTING SWITCH
The VOLUME control scale is directly calibrated
in dB. By adjusting it in combination with the
MUTING switch, it is possible to adjust the attenu-
ation more finely across a very wide range. The
attenuation (volume) is equal to the VOLUME
control indication plus 20dB.
@® One convenient application of the MUTING
Switch is for temporarily reducing the volume
while changing records, tapes or for other
applications. This eliminates the need for con-
tinual re-adjustment of the VOLUME control.
(Er ee ee § >) ONC CTS
e With late-night listening or at other times when
low volumes are used, precise adjustment
becomes difficult when the VOLUME control is
near the ~ position. In these cases, it is conve-
nient to first set the MUTING switch to -20dB
and then adjust the VOLUME control.
VOLUME
MUTING
~~ 200B
RECEPTION OF FM DOLBY BROADCASTS
If you live in an area’ where you can receive FM
Dolby broadcasts, you can listen in if you connect
an optional Dolby adaptor to the TAPE 2 jacks.
1. Connect the Dolby adaptor to the TAPE 2 jacks
(REC, PLAY), as shown in Fig..17.
. Depress the FM 25uS button.
. Set the TAPE MONITOR 2 switch to ON.
. Operate the Dolby adaptor.
. Depress the FM function button and tune in to
the Dolby broadcast with the tuning knob. For
reception, refer to ““FM RECEPTION” since the
procedure is the same.
Fig. 16
oo ® bd
NOTES:
e For detailed instructions on connections and the
handling of the Dolby adaptor, refer to its operating
instructions.
e When you are not listening to an FM Dolby broadcast,
return the FM 25uS button and the TAPE MONITOR
2 switch to their original positions.
SX-980
Ss ----- Se «A
_———— nO.
Jpaovo Ortee Os
Dolby adaptor
or
yor"
7 Fig. 17
15

TAPE DECK OPERATIONS
PLAYBACK
Proceed as follows when playing back pre-recorded
music tapes available on the open market, and
tapes on which you have recorded programs:
1. As shown in Fig. 18, set the TAPE MONITOR
switch 1 to ON if the tape deck is connected to
the TAPE 1 jacks. Set the TAPE MONITOR
switch 2 to ON if it is connected to the TAPE 2
jacks.
2. Operate the tape deck controls for playback.
8. Adjust the volume with the VOLUME control.
4. To adjust the tone, first set the TONE switch to
ON, and then adjust the BASS and TREBLE
controls for the preferred bass and treble levels.
NOTES:
1. Always return the TAPE MONITOR switch to the
upper position (OFF) when you are not playing back
a tape.
2. As long as the TAPE MONITOR switch I or 2 is at ON,
you will be able to play back a tape regardless of the
setting of the function buttons.
oY
(an
Wy Wi
sense
Tape deck 1
ee
aS
too Tape deck 2
Speaker systems
Fig. 18
RECORDING
1. Press the function button that corresponds to
the program source which you intend to record
(for example, a record off a turntable or an FM
broadcast).
2. Set the DUPLICATE switch to OFF (upper
position).
3. Play the selected program source.
4. Operate the tape deck controls and start record-
ing.
ried
. When recording, keep the MODE switch at STEREO.
Bi Adjust the recording level with the tape deck’s record-
ing level controls.
3. The receiver’s VOLUME, BASS and TREBLE controls
have no affect on the recorded sound when a recording
is being made.
Program source
i Tape deck
AUX TT
cy
tO O00 O00 bee ar
AUX PHONO 2/MIC PHONO 4
00000
Fig. 19
Tape monitoring
If a recording is being made on a 3-head tape deck,
the recorded sound can be monitored through the
speaker systems if the TAPE MONITOR switch 1
or 2 is set to ON. In this case, both recording and
playback connections must be made.
NOTE:
If you have a 2-head open-reel deck or cassette deck, you
will not be able to monitor the recorded sound even if
you set the TAPE MONITOR switch to ON. However,
you will be able to hear the sound at the playback end
(program source).
TAPE
DUPLICATE MONITOR
ON ON ON
Fig. 20
Duplicating and editing recorded tapes
If you have two tape decks, a recording of, say, a
complete FM broadcast can be made and then
those items that you want for your permanent
‘tape library’ can be selected and re-recorded onto
another tape. It is also possible to duplicate tapes
from an open-reel tape deck onto a cassette tape
deck.
1. As shown in Fig. 21, connect the tape decks to °
the receiver’s TAPE 1 and TAPE 2 jacks.
2. Set the DUPLICATE switch to ON.
3. Play back the recorded lad on tape deck land °
record it on tape deck 2. It is aiso possible to
play the tape back on tape deck 2 and record it
on tape deck 1.
4, Set the TAPE MONITOR switch 1 or 2 to ON
when you want to monitor the recorded sound.
e Do not set both tape decks to the recording
mode at the same time.
16

Fig. 21
USING PREAMP OUT AND
POWER AMP IN JACKS
If the connections between the PREAMP OUT
and POWER AMP IN jacks are removed (see
Fig. 22), it is possible to use the preamplifier
section and the power amplifier section independ-
ently. However, for normal use always keep these
connections in place since once you remove them,
no sound will be heard through the speakers.
Always set the POWER switch to OFF when
removing or replacing these connections.
Fig. 22
INDEPENDENT PREAMPLIFIER SECTION
As shown in Fig. 28, you can connect a high
output power stereo power amplifier or a home-
built power amplifier to the PREAMP OUT jacks
and compare the sound with the power amplifier
section of the stereo receiver.
Power amplifier
mpur
Fig. 23
PIONEER
INDEPENDENT POWER AMPLIFIER SECTION
As shown in Fig. 24, you can connect a stereo
amplifier which you may have to the POWER
AMP IN jacks and compose your own stereo
system.
Preamplifier
ppoo#o°
; eoeod
0
cof
y
Fig. 24
COMPOSING A MULTI-AMPLIFIER SYSTEM
As shown in Fig. 25, you can compose your own
multiamplifier system if you connect an optional
stereo power amplifier and crossover network.
A multi-amplifier system splits up the audible
frequency range into different frequency bands.
Each of these bands is then amplified by the
amplifiers and so this has the advantage of reducing
intermodulation distortion.
Crossover network HIGH RANGE Power amplifier
OUTPUT
OEE 000 6x6
FACE O FOE
OM o_O =>
LOW RANGE
OUTPUT
POWER AMP IN
Tweeter
Woofer
Tweeter
- Woofer
L.A
Z-way multi-amplifier system ‘
Fig. 25
17

SPECIFICATIONS
Semiconductors
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GS eye eek Seth ehh BAS Sie GS BE ey 8
VPANSIStORSs ceccnee'gcang on Sones ee ke wha Pens see ey 35
DIGdESs 22 sccateo de ees Be SAS Bae ROBE Se be es 45
Power Amplifier Section
Continuous power output of 80 watts” per
channel, min., at 8 ohms or 95 watts* per
channel at 4 ohms from 20 Hertz to 20,000
Hertz with no more than 0.05% total harmonic
distortion.
Continuous
Power
Output
at
1kHz
(both
channels
driven)
T.H.D.
0.05%,
8ohms
........
90
watts
per
channel
Total Harmonic Distortion (20 Hertz to 20,000 Hertz)
Continuous Rated Power Output . .No more than 0.05%
40 watts per channel power
output,
8ohms
..........
No
more
than
0.02%
1
watt
per
channel
power
output,
8ohms
..........
No
more
than
0.02%
intermodulation Distortion (50 Hertz: 7,000 Hertz = 4:1)
Continuous Rated Power Output . .No more than 0.05%
40 watts per channel power
output, 8ohms .......... No more than 0.02%
1 watt per channel power
output,
8ohms
..........
No
more
than
0.02%
Frequency
Response
...
5
Hertz
to
100,000
Hertz
*°
dB
Input
Sensitivity/
Impedance
POWER
AMP
IN
.........0-0065
1V/50
kilohms
Output
SPEAKERS
a5
ne
tbe
eee
Ma
oe
es
A,
B,
A+B
Damping
Factor
(20
Hertz
to
20,000
Hertz,
8
ohms)
.......-.--
30
Hum
and
Noise
(IHF,
short-circuited,
A
Network).
.
100dB
Preamplifier Section
Input (Sensitivity / Impedance)
PHONO
1,2
«2...
0c
eee
eens
2.5mV/50
kilohms
MIG
ceatace
oo
Sa
8
Pee
LE
es
7.5mV/50
kilohms
BUX
A.
eet
eae
ie
150mV/50
kilohms
TAPE
PLAY
1,2
...----++++-
150mV/50
kilohms
TAPE
PLAY
2(DIN
connector)
..
150mV/50
kilohms
PHONO
Overload
Level
(1kHz;
T.H.D.:
0.05%)
PHONO
(1,
Qo
etn
deer
be
ee
Fe
Ge
ee
200mV
Output
Level/
Impedance
TAPE
REGU
5:2.
<24
2.034%
es
ae
oes
ee
150mV
TAPE
REC
2(DIN
connector)
.
30mV/80kilohms
PREAMP
OUT
..........--0
00055
1V/1
kilohms
Total
Harmonic
Distortion
(20Hz
to
20,000Hz,
1V
output).
.
.No
more
than
0.05%
es
ng
EN
ee
eee
a
18
Frequency Response
PHONO(RIAA equalization) .20Hz to 20,000Hz +0.2dB
AUX, TAPE PLAY ........ SHz to 100,000Hz~3 dB
Tone Control
BASS fossa: SE eens +7dB/+10dB (100Hz)
Turnover Frequency 200Hz/400Hz
TREBLE ht hee tes +7dB/+10dB (10kHz)
Turnover Frequency 5kHz/2.5kHz
Filter
LOW, gs elena Sl Ge SWE 15Hz (6dB/oct.)
THIGH cect S dete Gave beatae eis 6kHz (6dB/oct.)
Loudness Contour (Volume control set
at —40dB position) .... +6dB (100Hz), +3dB (10kHz)
Hum and Noise
(IHF, short-circuited, A Network)
PHONO? ack bp herd eo Stk Sicha poe aed) BP ee ess 76dB
AUX, TAPE PLAY 2465.0 06¢ nad aareaes Giles 90dB
Hum and Noise (DIN: Continous Power/SOmW)
PHONO ® 5 Sc aceire eS Boe Go eae aS. 68dB/59dB
AUX, TAPE PLAY ..........0 004 ae 87dB/60dB
MUTING 4S. c.d 3 eer dig A elt, AR EE Ee —20dB
FM Tuner Section
Usable Sensitivity
MONO. .cgoy ee ana eee a Sige ee 9.8dBf (1.7pnV)
50dB Quieting Sensitivity —
MONG? 6 See eed ay accede 14.2dBf (2.8uV)
STEREO? cats be dvd 2d Seg lutein wreak 224 37dBf (39uV)
Sensitivity (DIN)
MONO) ove cise ees ee Vie dees de Rann and 1.2uV
STEREO!
2:44
ects
ened.s
Rae
ier
Oe
ee
eS
44yV
Signal-to-Noise
Ratio
(at
75dBf)...
STEREO
.........-2-005.
74dB
(at 65dBf)... MONO .. 0... ee ee eee 80dB
STEREO 0 edb ee e 71dB
Signal-to-Noise Ratio (DIN)
MONO
hug.
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3-6
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Ste
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70dB
STEREO:
sone
SARS
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Se
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62dB
Distortion
(at
65dBf)
100Hz MONO/STEREO ..........-: 0.1%/0.2%
1kHz MONO/STEREO ........... 0.1%/0.15%
6kHz MONO/STEREO .........--- 0.1%/0.2%
Frequency
Response
.......
30Hz
to
15,000Hz
+0.5dB
Capture
Ratio...
6.
ee
1.0dB
Alternate
Channel
Selectivity
........-..250+00-
80dB
Spurious
Response
Ratio
..........
2-202
ees
100dB
Image
Response
Ratio
....
2.6...
200
e
ee
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90dB
IF
Response
Ratio:
3.040
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100dB
*
AM
Suppression
Ratio
.......-....
0022s
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55dB
Muting
Threshold
..........-...245
19.2dBf
(5pV)
Stereo
Separation
. .
.
S0dB
(1kHz),
35dB
(30Hz
~
15kHz)
Subcarrier
Product
Ratio
..........0
00502
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65dB
SCA
Rejection
Ratio...
1...
2...
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Antenna
Input
..........-...-5+
300
ohms
balanced
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OTHERWISE NOTED K: 4.2 M:MQ2
CAPACITORS ;
INF UNLESS OTHERWISE NOTED P: pF
: SIGNAL VOLTAGE AT iGcWr lGUW 32
QUTPUT (IKHz)
V : OC VOLTAGE AT NO INPUT SIGNAL
mA : OC CURRENT AT NO INPUT SIGNAL
SWITLHES ;
Si FM OFF — ON
S, AM OFF — ON
Sy AUX OFF — ON
S. PHONG 2/MIC = OFE — ON Cc
Ss PHONO 1 OFF — ON
Sg QUPLICATE OFF — ON
S MONITOR] © OFF — ON
Ss MONITOR2 © OFF. — ON
Ss MOOE STERES — MONO
Sw LOUDNESS QFE — ON
Sy AF MUTING OFF — - 2048
Sy TURN WER = 40GH a ~ 20UHz
Sy TURN OER 25 KHz - SKHZ
Sa TONE OFF — ON
Sis LOW FILTER(ISHz) OF QFF — UN
Se HIGH FILTER(BkHz) OFF —ON
Sn SPEAKER A OFE—ON
Sip SPEAKER 8 OFF - ON
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Sm FM MUT OFF — uN
Sa POWER QFE — ON
Sw PROTECTION RELAY
Sig LINE VOLTAGE SELECTOR
220V- 240
This is the basic schematic diagram, but the
actual circuit may vory due to improvement
in design.