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Technics ST-HD50

Technics ST-HD50
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Tuner
System:
SC-HD50
*
SB-HDSOA
|
*
SB-HD50.
ST-HD50
or
_
ST-HD60
RS-HD70
SE-HD60
Remote
Control
ORDER
NO.
AD9702015C2
Service
Manual
Tuner
Colour
UTI)
cacvieeustaheeaawesaaunaneses
Gold
Area
Fie
con
usneteannmiaienindiisectnntes
Europe
*
System
Areas
Tuner
SC-HD50
(Germany.
Italy.)
:
ST-HD6O
SC-HD50
(Europe.
Russia.)
:
ST-HD50O
Because
of
unique
interconnecting
cables,
when
a
compact
requires
service,
send
or
bring
in
the
entire
system.
Specifications
Pre-amplifier
Section
Input
sensitivity/Impedance
EXTERNAL:
250
mV/15
kohm
Output
level
EXTERNAL:
250
mV/1.5
kohm
Frequency
response
EXTERNAL:
50
Hz
25
kHz
S/N
EXTERNAL:
DIN
82
cB
(83
GB,
IHF)
FM
tuner
Section
Frequency
range:
87.50
108.00
MHz
(0.05
MHz
steps)
Sensitivity:
1.8
pV
(IHF
usable)
S/N
26
dB:
1.5
yV
S/N
MONO:
70dB
(75
dB,
IHF)
Stereo
separation
1
kHz:
35
dB
Antenna
terminal(s):
75
ohm
(unbalanced)
System/SC-HD50:
AM
tuner
Section
Frequency
range:
522
1611
kHz
(9
kHz
steps)
530
1620
kHz
(10
kHz
steps)
Sensitivity
(S/N
20
dB):
500
pV/m
MAIN:
80
dB
Timer
Section
Clock:
Quartz-lock
type
Function:
24-hour
programmable;
Play
timer
(1
time),
Rec
timer
(1
time)
Sleep
(120
min.,
30
min.,
intervals)
Setting:
1
minute
23
hours
59
minutes
(1
min.
intervals)
General
Dimensions:
196(W)/67(H)/235(D)
mm
Weight:
1.2
kg
Notes:
Specifications
are
subject
to
change
without
notice.
Weight
and
dimensions
are
approximate.
Tuner:
ST-HD50
or
ST-HD60,
Compact
Disc
Player:
SL-HD60,
Amplifier:
SE-HD50,
Cassette
Deck:
RS-HD70,
Speakers:
SB-HD50A
Notes:
*
......
Made
in
PAES
ZA\WARNING
This
service
information
is
designed
for
experienced
repair
technicians
only
and
is
not
designed
for
use
by
the
general
public.
It
does
not
contain
warnings
or
cautions
to
advise
non-technical
individuals
of
potential
dangers
in
attempting
to
service
a
product.
Products
powered
by
electricity
should
be
serviced
or
repaired
only
by
experienced
professional
technicians.
Any
attempt
to
service
or
repair
the
product
or
products
dealt
with
in
this
service
information
by
anyone
else
could
result
in
serious
injury
or
death.
‘Technics
©
1997
Matsushita
Electric
Industrial
Co.,
Ltd.
All
rights
reserved.
Unauthorized
copying
and
distribution
is
a
violation
of
law.
Question and Answer IconNeed help?

Do you have a question about the Technics ST-HD50 and is the answer not in the manual?

Technics ST-HD50 Specifications

General IconGeneral
TypeDigital Tuner
Frequency Range (FM)87.5 - 108 MHz
Frequency Range (AM)522 - 1611 kHz
FM Sensitivity1.5 µV (IHF)
Signal-to-Noise Ratio (AM)50 dB
Output Level500 mV
Signal-to-Noise Ratio (FM)70 dB
Total Harmonic Distortion (FM)0.1%
Tuning SystemQuartz PLL Synthesizer
Frequency Response (FM)20 Hz - 15 kHz, +0.5/-1.5 dB

Summary

System Specifications

Pre-amplifier Section

Details input sensitivity, impedance, output level, frequency response, and S/N.

FM Tuner Section

Covers frequency range, sensitivity, S/N, stereo separation, and antenna terminal.

AM Tuner Section

Specifies frequency range and sensitivity for AM reception.

Timer Section

Explains clock type, programmable timer functions, and sleep timer settings.

General Specifications

Lists approximate dimensions and weight of the unit.

Controls and Basic Operation

Location of Controls

Identifies and describes the function of each button and indicator on the front panel.

Setting the Time

Step-by-step guide on how to set the clock and timer functions.

Troubleshooting and Self-Diagnosis

Self-Diagnostic Mode Overview

Explains the unit's self-diagnostic function and how it displays malfunction codes.

Malfunction Code Correction

Details specific display codes (U70 CD, Good-bye) and their corresponding correction procedures.

Service and Maintenance Procedures

Operation Checks and Procedures

Procedures for checking circuit boards and replacing main components.

Tuner and FL PCB Inspection

Detailed steps for accessing and inspecting the tuner and FL printed circuit boards.

Main PCB Inspection

Instructions for accessing and inspecting the main printed circuit board.

Component Identification

Illustrations and part numbers for ICs, transistors, and diodes used in the unit.

Power Supply for Servicing

Procedures for supplying power to the unit for testing and servicing.

Signal Output Check

Guidance on connecting equipment to check output signals.

Circuit Schematics and Diagrams

Schematic Overview

Overview of the different schematic diagram sections (Tuner, Main, Operation, etc.).

Tuner Circuit Schematic

Detailed schematic for the FM/AM tuner section.

InputOutput Circuit Schematic

Schematic for the input and output signal pathways.

Main Circuit Schematic

Comprehensive schematic of the unit's main internal circuitry.

FL Circuit Schematic

Schematic for the front panel display (FL) circuit.

Operation Circuit Schematic

Schematic detailing the operation and control circuits.

Printed Circuit Board Layouts

Tuner P.C.B. Layout

Diagram showing component placement on the tuner printed circuit board.

Connector P.C.B. Layout

Diagram showing component placement on the connector printed circuit board.

InputOutput P.C.B. Layout

Diagram showing component placement on the input/output printed circuit board.

Main P.C.B. Layout

Diagram showing component placement on the main printed circuit board.

FL P.C.B. Layout

Diagram showing component placement on the FL (display) printed circuit board.

Operation P.C.B. Layout

Diagram showing component placement on the operation printed circuit board.

Wiring and Connectivity

Wiring Connection Diagram

Illustrates how different circuit boards and external components are interconnected.

Integrated Circuit Function Details

IC Terminal Functions

Detailed pinout and function descriptions for integrated circuits, particularly IC901.

System Block Diagram

System Block Diagram

High-level overview of the unit's functional blocks and signal flow.

Electrical Parts List

Electrical Components

Comprehensive list of electrical components, their part numbers, and descriptions.

Cabinet and Connector Parts List

Cabinet, Connectors, and Hardware

Lists cabinet parts, connectors, switches, relays, and hardware with part numbers.

Resistors and Capacitors List

Resistors and Capacitors

Detailed listing of resistors and capacitors with their values and part numbers.

Cabinet Parts List

Cabinet Assembly Parts

List of screws, panels, feet, and holders used in the cabinet assembly.

Cabinet Parts Location

Exploded View of Cabinet

Diagram showing the location and assembly of cabinet parts.

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