Sony str av 270 x service manual

Page 2

STR-AV270X/AV370X

.. . 18.3 dBf. 4.5 uv
Sensmvfly at
(mono)
50 dB -
_ _ 33.3 dBf, 45 flV
qUIetIng
(stereo)
Usable 1 1.2 dBf, 2 uV (IHF) Loop antenna:
sensitivity 500 uV (at 1,000 kHz)
Signal-to- 76 dB (mono) 54 dB (at 50 mV/m)
noise ratio 70 dB (stereo)
Harmonic 0.3% (mono). 0.5% 05% (at 50 mV/m,
distortion (stereo) an kHz 400 Hz)
Selectivity 60 dB at 400 kHz 40 dB at 10 kHz
Separation 45 dB at 1 kHz -
Frequency 30 Hz - 15 kHz
response 1'? dB
General
System
Tuner section: PLL quad-locked digital
synthesizer system

Preanplifier section: low-noise NF type equalizer amp
Power amliiier section: quasi-complementary SEPP
Power requirements
AEP, Germany models: 220V AC. 50/60 Hz
UK model: 240V AC, 50/60 Hz
E model: 1 10-120V, 220-230V, 240V AC, adjustable,
50/60 Hz
Power consumption
STR-AV270X: 60W
STR-AV370X: 1 15W
In standby condition: 5W (STR-AV370X)
AC outlets
One switched (100W) (STFt-AV370X)
Dimensions
Approx. 430 X 122.5 X 300mm (w/h/d)
(17 X 4 7/. X 117/. inches)
including projecting parts and controls
Weight
STR-AV270X: Approx. 5.5 kg (12 lb 2 oz)
STR-AV370X: Approx. 6.5 kg (14 lb 5 oz)
Accessories supplied
FM wire antenna (1)
AM loop antenna (1)
Remote Commander (1) (STR»AV37OX)
Sony batteries SUM 3(NS) (2)

Design and specifications subject to change without notice.

TABLE OF CONTENTS

Section Mg Page
Specifications ...................... 1
Model Identification ---------- Z
1. GENERAL

Location and Function of Controls ----------- 3

Receiving FM/AM Broardcasts 4
2. ELECTRICAL ADJUSTMENTS ---------- 6
3. DIAGRAMS
3.1. Block Diagram ........................... 7
3-2. Printed Wiring Boards - Main Section - ~ - - 11
3-3. Schematic Diagram - Main Section - ----- 15
3-4. Printed Wiring Boards - Tuner Section - . ~ 19
3-5. Schematic Diagram - Tuner Section - ----- 20
3-6. Explanation of IC301 (,u PD75206) ---------- 23
4. EXPLODED VIEWS .................... 25
5. ELECTRICAL PARTS LIST ------------ 27

MODEL IDENTIFICATION
- Specification Labels ~

STRAAV270X
STR-ftva'IOX

SONY; MODEL NO.
FM STEREO/FM-AM RECEIVER

V//////%

SERIAL No.
MADE IN JAPAN

AEP, Germany model: AC: 220 - 230 V~50l60Hz

UK model: AC: 240 V ~50/60 Hz
E model: AC: 120/220/240 V ~50/60 Hz
1 15 W

SAFETVARELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
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 BV SONY.