Sony hsta 20 k service manual

Page 1

HST-AZIIK

SERVICE MANUAL

E Model

~ HST-A20K is the
STEREO DECK RECEIVER

in LBT-AZOK.
SPECIFICATIONS
Model Name Usin
g HST-A20
Similar Mechanism
Tuner
System FM stereo _
FWAM superheterodynetuner Tape Transport DECK A . TOM 1 90RA12CL
FM tuner 59mm" Mechanism Type DECK B : TCM-I QORBZZCL
Tuning range 87.510 108 MHz
Antenna 75 ohms unbalanced
300 ohms balanced
Intermediate lrequency 10.7 MHz
AM tumng section (for Mideastem moden Frequency response CD: 15 Hz to 50 kHz :g dB
Tuning range SW: 595 to 17.90 MHz
MW: 531 to Lem kHz c355,, deck
AM tuning section (model lor other countries) Recording system A-lrack 2-channel stereo
Tuning range 531 to 1.602 kHz (at 9 kHz step) Frequency response DOLBV NR OFF
530 I° 1-710 kHz (3 10 kHz 59) With Type II cassette (Sony UX-S)
Antenna AM loop antenna 40 Hz to 14 kHz (:3 GB)

External antenna terminal
Intermediate trequency 450 kHz

With Type I cassette (Sony HF-S)
40 HZI013 kHz (:3 dB)

Wow and Ilutter 0.1% (WRMS)
Amplifier
Peak music power output 550 W (5 ohms. 4 speakers drIven) General
Continuous HMS power output Power requirements 110 , 120 V/220 - 240 v AC. adjustable
40 W + 40 W (6 Ohms, al 1 kHz. 5% - with the VOLTAGE SELECTOR, 50/60 Hz
THD) Power consumption 120 W
_ Weight Approx. 8.9 kg
Input Jack type Sensmvrty Impedance Dlmenswns Approx. 355 X 330 x 325 mm
CD IN Phone 300 mV 47 kohms (w/h/d. including projectionSI
VlDEO IN Phone 300 mV 47 kohms Supplied accessories
PHONO lN Phone 3 mV 47 kohms Remote commander RM~SZ71 (1)
MIC 1 Phone 1 mV to kohrns FM 9 9" I
AM loop antenna [1)
MIC 2 Phone 1 mV 10 kohms Batteries Sony SUM-3 (NS) (2)
Microphone (1)
Output Jack type impedance Desrgn and specifications are subject to change without notice.
SURROUND Phono Accepts speakers or 8-16 ohms
SPEAKER
HEADPHONES Stereo phone Accepts headphones ol 3 ohms
or more

CUMPACT HiFi STEREO SYSTEM

SONY;

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DOLBY and the double-D symbol DC] are trademarks of
Dolby Laboratories Licensing Corporation.

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H ST-AZOK

TABLE OF CONTENTS

Section T_itl§
SECTION 1 GENERAL . .............. ..............
SECTION 2. ADJUSTMENTS
2»1. Mechanical Adjustments Wauu'ons .............. ....... 4
2.2. Elecuiml Adjusmms fimdons..........m .............. 4
SECTION 3. DIAGRAMS
3.). Circuit Boardslncauon ................ .... ........... m... 7
3-2. Semioonducwr Lead Layouts ....... ..... .............. ....... 8
3-3. Printedwiring Boards
-Audio Section-(E. MY model) ..
34 Prindeiring Boards
-Audio Section-(FA model) ............. . .......... 13
3-5. Schematic Diagrams-Audio Section- ~~~~~~~~~~~~~~~~ 17
1c Block Diagrams ...................................... 19
3-6. Schematic DiagramrPanel Seclion- ........... 20
ICBIock Diagrams .................... 22
3-7. Primed Wiring Boards-Panel Section- 23
3<8. Schematic Diagrams-TC Secfiorr- 26
3-9. Printed Wiring Boards-TC Section- 29
3-10. Schemafic Diagramr-Tuner Seclion- ........ ...... 33
[c Block Diagrams ............ .......... ....... 36
SECTION 4. EXPLODED VIEWS
44' Cabinet Seclion .................. . ............................. 37
4.2, Front Panel Section ................. . ............ ......... 38
4.3. Mechanism Section-1 ............... 39
4.4, Mechanism SeCH'on-Z .. ................... . ........... 40
4-5I Mechanism Section-3 ................... . ............ 41
SECTION 5. ELECTRICAL PARTS LIST --------------------- 42

SAFETYARELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BV 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 BY SONY.