Sony str gx 70 esa service manual

Page 2

FM/AM tuner section
FM tuner AM tuner
section section
Tuning 87.5 - 103 MHZ 531 - 1.602 kHz
Antenna 75 ohms, External
unbalanced antenna
terminal.
loop antenna
Intermediate 10.7 MHz 450 kHz
frequency

Sensitivity 16.8 dBI. 1.9 uV
at 50 dB (75 ohms)

quieting (mono)
37.9 dBI,
21.5 Irv
(75 ohms)
(stereo)
Usable 11.2 eat, 2 MV Loop antenna:
sensitivity (IHF) 50 dB/m
(at 1.000 kHz)
External
antenna:
100 ,Lv

(at 1,000 kHz)

Signal-to- 77 dB (mono) 50 dB
noise ratio 73 dB (stereo) (at 50 mV/m)

Harmonic 0.05% (mono). 0.3%
distonion 0.07% (stereo) (at 50 mV/m,

at 1 kHz 400 Hz)
Selectivity 85 dB 30 dB at 9 kHz
at 400 kHz
Separation 55 dB at 1 kHz
Frequency 30 Hz - 15 kHz
response iii d8
General
System Tuner section: PLL quartz-locked

digital synthesizer system
Preamplilier section: low-noise
NF type equalizer amp
Power amplifier section: pure-
complernentary SEPP
Power requirements
220 V AC, 50/60 Hz
Power consumption
150 W
AC outlet One switched (100 W max.)
Dimensions Approx. 430 X 135 X 375 mm
(w/h/d) including projecting parts
and controls
Weight Approx. 8.9 kg net
Approx. 10.2 kg in shipping canon
Accessories supplied
FM wire antenna (1)
AM loop antenna (1)
Remote Commander RM-U203 (1)
Sony batteries SUM-3(NS)
(tor the remote commander) (2)

Design and specifications subject to change
without notice.

Note
This appliance contorms with EEC Directive
87/ 308/ EEC regarding lnterierence suppression.

TABLE OF CONTENTS

Section Title Page
1. GNERAL
I-l. Part Identification
2. ELECTRICAL ADJUSTMENTS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4
3. DIAGRAMS
3-1. Frame Schematic Diagram 6
3-2. Circuit Boards Location~-~ ~8
3-3. Printed Wiring Boards and Schematic Diagrams 10

3-5.

4. EXPLODED VIEWSmu

MAIN, REC OUT CONNECTOR. REC OUT

SELECT Boards ..... t... .......................................... 10
DISPLAY, POWER SW. SPEAKER SW, Boards ~~~~~~~ 16
TRANS TERMINAL (B), TRANS TERMINAL (A).
INP SELECTION, CONNECT (B), POWER SUPPLY,
SPEAKER TERMINAL, TONE, CONNECT (A),
MOTOR, VOL LED Boards ................................... 22
TUNER Board .......... 9.940000 ....................... u 28
FM Front End (FEOI) Schematic Diagram
1C Block Diagrams. .............................. .u... .......... 32
Explanation of IC301 (,uPD75206)-
Semiconductor Lead Layouts ---------

5. ELECTRICAL PARTS LIST ................... .............. 40

SAFETY-RELATED COMPONENT WARNING! I

COMPONENTS IDENTIFIED BV MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC OIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.