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Sharp RT-203H - User Manual

Sharp RT-203H
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SHARP
SERVICE
MANUAL
/SERVICE-ANLEITUNG/
MANUEL
DE
SERVICE
S65A4RT-203HS
RT-203H(S)(BK)(BR)
RT-203E(BK)
Note
for
users
in
UK
;
.
Recording
and
playback
of
any
material
may
require
consent
which
PHOTO:
RT-203H(S)
SHARP
is
unable
to
give.
Please
refer
particularly
to
the
provi-
sions
of
Copyright
Act
1956,
the
Dramatic
and
Musical
Performers
pia
DOLBY
SYSTEM
®
Protection
Act
1958,
the
Performers
Protection
Acts
1963
and
BG
and
to
any
subsequent
statutory
enactments
and
orders.
@Noise
reduction
system
manufactured
under
license
from
Dolby
5
~
Laboratories
Licensing
Corporation.
“Dolby”
and
the
double-D
(“ein
the
interests
of
user-safety
the
set
should
be
restored
to
its
symbol
are
trademarks
of
Dolby
Laboratories
Licensing
Corporation.
original
condition
and
only
parts
identical
to
those
specified
be
e@
Gerduschunterdriickungssystem
unter
Lizenz
von
Dolby
Laboratories
used.
Licensing
Corporaton
hergestellt.
Das
Wort
“Dolby”
und
das
Symbol
e
im
Interesse
der
Benutzer-Sicherheit
sollte
dieses
Gerat
wieder
auf
des
doppelten
D
sind
die
Warenzeichen
von
Dolby
Laboratories
seinen
ursprunglichen
Zustand
eingestellt
und
nur
die
vorge-
Licensing
Corporation.
de
: ;
schriebenen
Teile
verwendet
werden.
¢
Réducteur
de
bruits
Dolby:
Circuit
fabriqueé
sous
Hibenes
des
Dolby
@
Dans
I‘intérét
de
la
sécurité
de
l'utilisateur,
l’appareil
devra
étre
Laboratories
Licensing
Corporation.
Le
mot
“Dolby”’
et
le
symbole
reconstituté
dans
sa
condition
premiére
et
seules
des
piéces
double
D
sont
des
marques
déposées
des
Dolby
Laboratories
identiques
a
celles
spécifiées,
doivent
étre
utilisées.
Licensing
Corporation,
INDEX
TO
CONTENTS
————————————sS
Page
Page
SPECIFICATIONS
.0.......ccscsececsecseetessceeeeeceseseeeeeeeaes
2-4
WIRING
SIDE
OF
P.W.BOARD.........00eccceseeeseeerenes
15,
16
NAMES
OF
PARTS......cccccccccesceeceeeeeeeeeeeeeeeeeusneners
2-4
SCHEMATIC
DIAGRAM.........cccccccececeseeeeeeeeeseieee
.
17,
18
BLOCK
DIAGRAM.
.........-:sccseeeessesccceceeseesseeeeseceeeeeenenes
5
EQUIVALENT
CIRCUIT
(BLOCK
DIAGRAM)
OF
(C........
19
DISASSEMBLY
........cccceseeeeccessecceeeceesseseeeeeseceeeeenees
6,
7
TYPES
OF
TRANSISTOR
AND
LED...........cccccecse
eeeeeee
19
CIRCUIT
DESCRIPTION
.......cccccccccccceeseeeeeeeeeeeeeeeeeees
8,9
EXPLODED
VIEW
......:.cccccececccsseseeeaseeeesseseesenies
-
20—22
MECHANICAL
ADJUSTMENT
...........:::seeeeeeeeerers
10,
11
REPLACEMENT
PARTS
LIST
.........c00ceccceceeeeernses
.
23-28
CIRCUIT
ADJUSTMENT
.........00cccecceececeseeeeeeeeeeees
12,
13
PACKING
METHOD
(RT-203E
ONLY).......ccccssecce
eeeeees
30
NOTES
ON
SCHEMATIC
DIAGRAM.
........ccccseseeeseeeeees
14
INHALTSVERZEICHNIS
()
Seite
Seite
TECHNISCHE
DATEN.....cc0cecceseccececccessssseaeeeseeeeeenes
2-4
VERDRAHTUNGSSEITE
DER
LEITERPLATTE.........
.
15,
16
BEZEICHNUNG
DER
TEILE..........00ccccceeeeeccceeeeeeeeeees
2-4
SCHEMATISCHER
SCHALTPLAN......ccccccceeeeeeeeee
.
17,
18
BLOCKSCHALTPLAN
.....cccceecscceececseeseeeesseeseeeeeeeessaenees
5
ERSATZSCHALTKREIS
(BLOCKSCHALTPLAN)
ZERLEGEN
sccccccssvsavicsveandiscesusbssieescoceeensestsavedvaaeana
6,7
DES
INTEGRIERTEN
SCHALTKREISES.
...........
ce:
19
KREISBESCHREIBUNGEN...............:ssseeeeeeeeceeeseneneees
8,9
TRANSISTOREN-UND
LEUCHTDIODENTYPEN
......
....---
19
MECHANISMUSEINSTELLUNG
.............ccc0eeeeee
eens
10,
11
EXPLOSIONSDARSTELLUNG...........c0ccessseeeeeeenes
.
20—22
SCHALTUNGSEINSTELLUNG.............000000csesereeeees
12,
13
ERSATZTEILLISTE
.........cccccccccseccceeneceeseeueeeeaes
.
23—28
ANMERKUNGEN
ZUM
SCHEMATISCHEN
SCHALTPLAN
14
TABLE
DES
MATIERES
Page
Page
CARACTERISTIQUES
........00ccccceccsseecssceseceeeeeecuerenes
2-4
COTE
CABLAGE
DE
LA
PLAQUETTE
DE
MONTAGE
NOMENCLATURE
.........0000eccssceseeecessceeeeeeceeeseeseseaes
2-4
IMPRIME
asaceStanect
tex
tesactsdeertatiseicdaiee
cme
ties
.
15,
16
DIAGRAMME
SYNOPTIQUE............ccccceeeseseccceeeeeeeeeeees
5
DIAGRAMME
SCHEMATIQUE
...........cccccc
esse
eeenes
17,
18
DEMONTAGE
......0ccccccccccceeeececececsseccecueueuseueeeneeeees
6,7
CIRCUITS
EQUIVALENTS
(DIAGRAMME
SYNOFTIQUE)
DESCRIPTION
DU
CIRCUIT...........cccceceescececeeeneeeeeees
8,9
DES
CM
ies
228:
sec
vocesdisnaxoaceavneasuaniatieies
ae
saan
19
REGLAGE
DE
MECANISME
..........0cccccccseseeeeeeeeeees
10,
11
TYPES
DE
TRANSISTOR
ET
LED..........cccc.eeeseuee
eeeneee
19
REGLAGE
DU
CIRCUIT
..0.....cccccccccccceeesseeeeceeeeeees
12,
13
VUE
EN
ECLATE
.......ecccceceeeeesccceeesesuseeeeseneeennes
20—22
REMARQUES
CONCERNANT
LE
DIAGRAMME
LISTE
DES
PIECES
DE
RECHANGE................-64..
23-28
SCHEMATIQUE..........00..ceccceeccuccsceseuerececseececneees
14
SHARP
CORPORATION
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Sharp RT-203H Specifications

General IconGeneral
Frequency Response20Hz to 20kHz
Input Sensitivity2.5mV (MM), 150mV (line)
Signal-to-Noise Ratio70dB (MM), 90dB (line)
TypeStereo Receiver
Power Output20 watts per channel into 8Ω (stereo)

Summary

Specifications

Semiconductors

Lists the types and quantities of semiconductors used in the unit.

Tape Specifications

Details tape types, speed, and wow/flutter performance.

Frequency Response

Outlines the frequency range achievable with different tape types.

Input Sensitivity and Impedance

Specifies microphone input sensitivity and impedance levels.

Dimensions and Weight

Provides the physical size and mass of the audio unit.

Names of Parts

Block Diagram

Disassembly

Disassembly Precautions

Lists essential safety precautions for disassembling and reassembling the unit.

Disassembly Procedures

Circuit Description

Synchronous Start Circuit

Explains the circuit that enables simultaneous start of both decks during dubbing operations.

Mechanical Adjustment

Adjustment Points Overview

Details the specific points and tools needed for mechanical adjustments.

Test Tapes for Measurement

Lists specific test tapes required for various measurement and adjustment procedures.

Circuit Adjustment

Bias Oscillator Frequency and Bias Current

Details the procedure for adjusting bias oscillator frequency and bias current.

Erase Current Adjustment

Describes how to adjust the erase current level for optimal performance.

Playback Sensitivity Adjustment

Covers the steps for adjusting playback sensitivity for both Deck 1 and Deck 2.

Notes on Schematic Diagram

Resistor and Capacitor Notation

Explains the notation used for resistors and capacitors in schematic diagrams.

Safety and Measurement Notes

Provides important notes regarding safety parts, voltage measurement, and operating modes.

Deck 2 Record;Playback Sensitivity

Equivalent Circuit (Block Diagram) of IC

Types of Transistor and LED

Displays common transistor and LED types used in the circuitry with their pinouts.

Mechanism Exploded View (1;2)

Mechanism Exploded View (2;2)

Cabinet Exploded View

Replacement Parts List

Integrated Circuits

Lists part numbers, descriptions, and codes for integrated circuits.

Transistors

Lists part numbers, descriptions, and codes for various transistors.

Capacitors

Lists part numbers, descriptions, and codes for capacitors.

Resistors

Lists part numbers, descriptions, and codes for resistors.

Circuit Parts

Lists part numbers, descriptions, and codes for various circuit components like connectors and switches.

Mechanical Parts

Lists part numbers and descriptions for mechanical components such as buttons and brackets.

Cabinet Parts

Lists part numbers and descriptions for cabinet components and screws.

Accessories;Packing Parts

Lists part numbers and descriptions for accessories and packing materials.

Packing Method (RT-203 E ONLY)

Setting Positions of Switches and Knobs

Specifies the correct settings for switches and knobs during packing.

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