Pioneer sx 780 owners manual

Page 1

AM/FM STEREO RECEIVER

x-7a- KC

OPERATING INSTRUPTIOWNS KU

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Walnut grained vinyl top and side panels are used in the
construction 01 this cabinet.

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iMPORTANT NOTICE

The serial number for this equipment is located on the rear
panel. Please write this serial number on your enclosed
WW-rv-W- ~ ~~~~~~~~~~~~~ w .4 warranty card and keep in a secure area. This is for your
security.

WARNING: TO PREVENT FIRE OR SHOCK
A» EEEEEEEE we ., , 1 HAZARD. Do NOT EXPOSE THIS APPLI- _
_' ANCE T0 RAIN 0R MOISTURE.

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Page 2

C0 NTENTS

Features ............................ 2 FM Reception ........................ 12
Stereo System Compositions ............. 3 AM Reception ........................ 12
Installation Cautions ................... 3 Playing Records ...................... 12
Connection Diagram .................... 4 Using the AUX jacks .................. 12
Connections .......................... 6 Tape Deck Operations .................. 13
Antenna and Ground Connections ......... 8 FM-Dolby Reception .................. 14
Front Panel Facilities .................. 10 Specifications ........................ 14
Before Operation ..................... 12 Conditions Frequently Mistaken for

Malfunction ....................... 16

FEATU RES

High-Output, Low-Distortion High-Power Amplifier

The differential amplifier with its current mirror load
employing PNP dual transistors in the first stage helps to
yield a high gain even in the high-frequency range. The pre-
drivcr stage features a constant current circuit as the load
for upgraded gain. The power stage uses Darlington power
le which provide stable characteristics and eliminate the
effects of the transient response. The NFB circuit is con-
figured as a DC amplifier without the use of capacitors for
improved dynamic characteristics and a stable output.

TthX-780deliversaContinuous Power Output of
45 wattsper channel, min., at 8 ohms from
20 Hertz to 20.000 Hertz with no more than
0.05% total harmonic distortion.

This is more than enough power for satisfying music
listening requirements.

High-Stability FM Tuner

The first stage of the front end is configured with a
3-gang variable capacitor and a 3-stage RF amplifier with a
dual gate MOS FET for a high sensitivity of l.8uV (IHF).
The lF stage packs two [Cs and three dual-element ceramic
filters which feature superb phase characteristics. These
produce a sufficient gain and excellent limiter character-
istics as well as a low distortion of 0.07% (IkHz, mono) and
a high signalto-noise ratio of 80dB (mono). The MPX stage
contains a l9kHz pilot signal auto canceller lC which
extends the frequency response up to the high-frequency
range and produces an extremely clear FM sound. There is
also an FM muting circuit which cuts out all that irritating
noise when detuning or when setting the FUNCTION
switch.

High-Fidelity Equalizer Amplifier

The SX-780 has an lC-configured NFB-type equalizer
amplifier which is characterized by its low noise and high
gain. The maximum allowable input level is 200mV (at
lkHz) and only precision parts are used for the RIAA
elements for an RIAA deviation of only _+_0.2dB across a
frequency range of 20Hz to 20kHz.

Tone Controls with Tone Defeat Function

When the CR-type bass and treble tone control knobs
are set to the center position (OFF), the tone control net-
works are automatically disengaged and uniformly flat
frequency response is yielded. There is also a low cut filter
which cuts out the ultra-low-frequency noise at frequencies
below lSHz.

Built-in Protection Circuits

The lC-based protection circuit protects the power
amplifier and the speakers from unforeseen accidents and
mishaps. This circuit cuts out the unpleasant noise generat-
ed when the power switch is turned on and off.

Independent Power Meters

The independent left and right channel power meters
enable the strength of the output signal to be read out
directly, thanks to their logarithmic compression circuitry,
from 0.0iW up to IOOW without any switches having to be
thrown.

*Memred pursuant to Federal Trude Commission '3 Trade
Regulation Rule on Power Output Claims for Amplifiers.