Pioneer sx 980 owners manual

Page 1

AM/FM STEREO RECEIVER

X-SB.

OPERATING INSTRUCTIONS S/G

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n r r f T

Q. - $1.1: fl "a 1" SX-980 is designed to operate from 110V, 120V. 220V
_ f if? f f or 240V main. Before turning on the power. please
confinn the line voltage setting indicated on the rear
of mm unit corresponds to the supp/v voltage in vour
area. if not. (hange the setting as described in LINE

VOLTAGE SELECTOR SWITCH on page [9

CONTENTS
Features ............................. 2
Stereo System Composition ................ 3
Installation Cautions ..................... 3
Connection Diagram ...... .: . . . ............ 4
Connections .......................... 6
Antenna and Ground Connections ............ 8
Front Panel Facilities .................... 10
Prior to Switching Power On ................ .13
FM Reception ......................... 13
AM Reception ......................... 13
Playing Records ........................ 14
Using the Microphone .................... 14
Using the AUX jacks ..................... 14
Effective Operation ...................... 15
Tape Deck Operations .................... 16
Using PREAMP OUT and POWER AMP IN Jacks . . 17
Specifications ......................... 18
Line Voltage Selector Switch ............... 19
Conditions Frequently Mistaken for Malfunction . . 20
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GDPIONEER

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Page 2

FEATURES

Power Amplifier for a Continuous Power Output
of 80 Watts Per Channel and for Ultra-Stable
Sound Reproduction

0 The adoption of a single-stage differential amplifier with
low-noise dual transistors, pre-driver stage a current
mirror load and an SEPP circuit provides a bumper
power output of 80 watts + 80 watts(c0n[inu0us

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.

0 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.

O 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.

lC-Based FM Tuner with High Selectivity, High S/N
and Low Distortion

O The FM front end incorporates a l-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: l.7uV (lHF)
sensitivity, more than lOOdB spurious response ratio
and more than 90dB image response ratio.

0 The FM IF amplifier combines three dualelement phase-
linear ceramic filters with two lCs which contain
quadrature detectors for a high selectivity (80dB) and a
low distortion (MONO: 0.1% at lkHz).

O 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 IC

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,

stable reception can be obtained with low spurious inter-
ference and distortion even in high field strength areas.

Precise Record Equalization

O A balanced power supply is used in the equalizer ampli-
fier to obtain a maximum allowable input of 200mVrms
(lkHz). Low distortion record playback can thus be
enjoyed even with high output phono cartridges and
music sources containing large peak signals.

0 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
10.2dB 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 251.15 switch: The receivers 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 lSHz (low) filter 'switches: Featured are
a filter for 6dB/octave attenuation at frequencies below
lSHz 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.

2

*Measured pursuant to Federal Trade Commission s Trade
Regulation rule on Power Output Claims for Amplifiers.