Sony hsta 20 service manual

Page 1

HST-A20

SERVICE MANUAL E Model

gage . Australian .Mode/

' HST-A20 is the
STEREO DECK RECEIVER

in LBT-AZO.
SPECIFICATIONS
Model Name Usin
. . g TC-507
Tune, Similar Mechanism
Syslem FM stereo
FM/AM superheterodyne tuner Tape Transport DECK A : TCM-l 90RA1 20L
FM tuner section
Tuning range 87.5 to we MHz Mechanism Type DECK B : TCM-l 90RB22CL
Antenna 75 ohms unbalanced
300 ohms balanced
|ntermediate lrequency 10] MHz Frequency response CD: 15 Hz to 50 kHz :3 dB
AM tuning section (tor Mideastern model)
Tuning range SW: 535 to 17.90 MHZ cassette deck
MW: 531 to 1,502 kHz Recording system 4»track 2-channel stereo
AM tuning section [model tor other countries) Frequency response DOLBY NFt OFF
Tuning range 531 to 1,602 kHz (at 9 kHz step) With Type II cassette (Sony UX-S]
530to1.710 kHz (at 10 kHz slep) 40 Hzlo14 kHZ [:3 d8)
Antenna AM loop antenna With Type l cassette (Sony HF-S)
External antenna lerminal 40 Hz lo 13 kHz (:3 dB)
Intermediate trequency 450 kHz Wow and flutter 0.1% (WRMS)
Arnplltler General
Peak musrc power output 550 W (6 ohms 4 speakers driven) Power requirements 110 - 120 V/220 - 240 V AC, adjustable
Continuous HMS power output I wrlh the VOLTAGE SELECTOR 50/ 60 H2
40 W + 40 W [6 ohms, at 1 kHz. 5% Power consumpllon 120 W
THD) Weight Approx, as kg
Dimensions Approx. 355 X 380 X 325 mm
Input Jack type Sensitivity Impedance (w/h/ do ll'lCIudillg proiectlons)
CD IN Phone 300 mV 47 kohms
VlDEO lN Phone 300 mV 47 kohms 5PP" 595
45-rprn adaptor (1) (only for Latin American and Australian models)
PHONO IN Phono 3 mV 47 kohms Remote commander FlM-SZ71 (1)
MIC Phone 1 mV 10 kohms FM wire antenna (1)
AM loop antenna 11)
Batteries Sony SUM-3 (NS) (2)
Microphone (1) (only let LBT-AZOK)
OUIDUI Jack type impedance Design and specificallons are subject to change without notice.
SURROUND Phono Accepts speakers DI 8-16 ohms
SPEAKER
HEADPHONES Stereo phone Accepts headphones of 8 ohms
or more

COMPACT H'F' STEREO SYSTEM
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
DOLBY and the double-D symbol D0 are trademarks of ®

Dolby Laboratories Licensing Corporation,

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HST-A20

Section
SECTION 1.

SECTION 2.
2- 1.

2-2.

SECTION 3.
3-1.
3-2.
3-3.
3-4.

3~5.

3-6.
3-7.
3-8.
3-91

SECTION 4.
4-1.
4-2.
4.3.
4-4.
4-5.

SECTION 5.

TABLE OF CONTENTS

Title ' Page
GENERAL ......................................................... 3
ADJUSTMENTS
MECHANICAL ADJUSTMENTS PRECAUTIONS ~~~~~~~~~~ 4
ELECTRICAL ADJUSTMENTS PRECAUTIONS " 4
DIAGRAMS
CIRCUIT BOARDS LOCATION ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7

SEMICONDUCTOR LEAD LAYOUTS ~ N 8

PRINTED WIRING BOARDS - AUDIO Section - ~~~~~~ 9
SCI-IEMATIC DIAGRAMS - AUDIO Section - ~~~~~~ 13
IC BLOCK DIAGRAMS ....................................... 15
SCHEMATIC DIAGRAMS V PANEL Section ~* ~~~~~~ 16
IC BLOCK DIAGRAMS 18
PRINTED WIRING BOARDS-PANEL Sectian- 19
SCI-[EMATIC DIAGRAMS - TC Section - 22
PRINTED WIRING BOARDS-TC Section - ~~~~~~ 25
SCHEMATIC DIAGRAMS - TUNER Section ~' 29

[C BLOCK DI AGRAMS ....................................... 32

EXPLODED VIEWS

FRONT PANEL SECTION ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 34
MECHANISM SECTION -1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 35
MECHANISM SECTION .2 ~ ............. 36
MECHANISM slam-101.14 .................................... 37
ELECTRICAL PARTS LIST ~~~~~~~~~~~~~~~~~~~~~~~~ 38

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BV MARK & 0R 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.