Pioneer TX 7500 Owners Manual

Page 1

STEREO TUNER

TX-7EDD FF

OPERATING INSTRUCTIONS

This manual applies to both 220V and 5-voltage models.

If your unit is the latter, the line voltage can be selected

04) DIONEEI?» according to description on page 11.

Page 2

Features ............................ 2
Installation Hints ..................... 2
Connection Diagram .................. 3
Connections ......................... 4
Antenna & Ground Connections ......... 4

Front Panel Facilities

CONTENTS

Broadcasts Reception ................. 7
Improving FM Reception ............... 8
Conditions Frequently Mistaken

for Malfunction ..................... 9
Specifications ....................... 10

Line Voltage and Fuse

FEATURES

4-GANG VARIABLE CAPACITOR FRONT
END

The precision engineered front end utilizes a 4-gang
air spaced variable capacitor and FET (field effect
transistor) first stage radio frequency amplifier
circuit. All characteristics affecting top per-
formance, including selectivity, imaging and
spurious rejection, signal to noise ratio and other
factors, are developed to optimum levels.

HIGH STABILITY FM IF SECTION

Three dual element phase linear ceramic filters are
employed in the intermediate frequency amplifier
circuit. High density IC circuitry incorporates
a 3-stage differential amplifier, diode limiter, and
quadrature detector to yield effortless selectivity
plus superb S/N and distortion characteristics.
Capture ratio is also significantly improved.

SUPERIOR FM PROGRAM RECEPTION

A revolutionary phase~locked loop (PLL) circuit
assures high stability in the vital stereo demo»
dulator. Impervious to the effects of ambient
temperature and aging, this innovation always
allows optimum frequency response and separation.
The output circuit contains built-in low pass and
subsonic filters which block extraneous noise
produced in the ultra high and ultra low ends of
the frequency spectrum. The result is clear and
stable FM stereo reproduction.

ADVANCED IC AM TUNER

Full performance is built into the AM tuner
through 1C and ceramic filter circuitry, providing
improved selectivity and frequency response,
together with minimized spurious interference and
distortion. The balanced mixer circuit further
enhances spurious characteristics to permit re-
freshing AM sound even in strong signal areas.

2

DUAL FUNCTION MUTING CIRCUIT

Annoying interstation noise and tuning noise are
completely eliminated by the carefully designed
muting circuit. The circuit incorporates a semi-
conductor switch and reed relay to provide
comfortable station selection.

VERSATILE ACCESSORY FACILITIES

FM MPX NOISE Filter: Can be employed to
eliminate objectibnable high frequency noise from
FM stereo broadcasts.

2 Sets of OUTPUT Jacks plus OUTPUT LEVEL
Control: VARIABLE jacks, which feature adjust-
able output level, and non-variable FIXED output
jacks are both provided.

FM MULTIPATH Jacks: Provided for con-
nection of an oscilloscope or stereo display. FM
antenna orientation and height can then be
monitored for minimum multipath interference.

INSTALLATION HINTS

Avoid installing the TX-7500 in locations such as

the following.

o 'In direct sunlight, near radiators or other heat
sources.

0 Above a large heat producing power amplifier,
or near an amplifier power transformer.

I In humid or dusty surroundings.

0 On an unlevel or unstable surface, or where
subject to vibration.