Technics SA-203

ORDER NO. SD82082280C2
ervice Manual
FM/AM
Stereo
Receiver
SA-203
[EGA]
SA-203(K)
[EGA]
* The cabinet and front panel are available in black color and silver Area
types.
*
The
black
type
model
is
provided
with
(K)
in
the
Service
Manual.
*
[EGA]
is
available
in
F.R.
Germany.
TECH N ] SCH E DATE N (Spezifikationen K6nnen infolge von Verbesserungen ohne Ankiindigung geandert werden.)
(DIN 45 500)
@ VERSTARKERTEIL
Gerauschabstand
Nennleistung (4 ©)
Phono
Aux, Tape
—26 dB Leistung (4 Q)
Phono
Aux, Tape
50 mW Leistung (4 ©)
Phono
Aux, Tape
Frequenzgang
Phono
70 dB (nach IHF, A: 78 dB)
Dauerton-Ausgangsleistung bei 20 Hz ~ 20 kHz
88 dB (nach IHF, A: 95 dB)
beide Kandle ausgesteuert 2 X 30W (4.9)
2 X 30W (8 Q)
Dauerton-Ausgangsleistung bei 40 Hz ~ 16 kHz
beide Kanile ausgesteuert 2X: 30W (4 Q)
2 X 30W (8 )
64 dB
66 dB
62 dB
Dauerton-Ausgangsleistung bei 1 kHz
62 dB
beide Kanadle ausgesteuert 2 X 35W (4 Q)
2 X 33W (8 Q)
RIAA-Standardkurve
+0,8 dB (30 Hz ~ 15 kHz)
5 Hz ~ 70 kHz2( -3 dB)
+0,2 dB (20 Hz ~ 20 kHz)
GehGrrichtige Lautstarkekorrektur (Loudness)
(bei -30 dB Ausgangsleistung)
Ausgangsspannung und -impedanz
Tape Aufnahme (TAPE REC OUT)
Gesamtklirrfaktor
Nennleistung
bei
20
Hz
~
20
kHz
0,08%
(4
Q)
0,04% (8 Q)
0,08% (4 Q)
0,04% (8 Q)
0,04% (4 9)
0,04% (8 Q)
0,025% (8 Q)
Aux, Tape
Nennleistung bei 40 Hz ~ 16 kHz
Nennleistung
bei
1
kHz
50
Hz,
+9 dB
150 mV
halbe Nennleistung bei 20 Hz ~ 20 kHz
halbe Nennleistung bei 1 kHz
—26 dB Leistung bei 1 kHz
50 mW Leistung bei 1 kHz
Intermodulationsfaktor
Nennleistung
bei
250
Hz:
8
kHz
=
4:1,
4
Q
0,08%
Nennleistung bei 60 Hz: 7 kHz = 4:1, nach SMPTE, 8 Q
0,04%
0,009% (8 1)
0,1% (4 9)
0,12% (4 Q)
Leistungsbandbreite
beide Kandle ausgesteuert bei —3 dB
10 Hz ~ 30 kHz (4 )
Dampfungsfaktor 15 (4.Q), 30 (8.Q)
Eingangsempfindlichkeit und -impedanz
Phono 2,5 mV/47 kQ
Aux
150
mV/22
kQ
Tape 180 mV/22 kQ
Maximale TA-Eingangsspannung (1 kHz, eff.) 130 mV
Klangregler
Bafregler (BASS)
Hdhenregler (TREBLE)
‘Technics
50 Hz, +10 dB ~ —10 dB
20 kHz, +10 dB ~ -10 dB
+1 dB
55 dB
260 mV/330 Q
Kanalabweichung (Aux, 250 Hz ~ 6300 Hz)
Obersprechdaémpfung (Aux, 1 kHz)
KopfhGrerpegel und -impedanz
Lautsprecherimpedanz
MAIN oder REMOTE
MAIN und REMOTE
4Q~169
8Q~ 169
@ UKW-TUNERTEIL
Wellenbereich
87,5
~
108
MHz
Eingangsempfindlichkeit
S/R 30 dB
S/R 26 dB
S/R 20 dB
Nutzempfindlichkeit nach IHF
Gesamtklirrfaktor
Mono : : 0,15%
Stereo
0,2%
1,3 pV (75.9)
1,2 pV (75 Q)
0,9 pV (75 Q)
1,5 pV (nach IHF ’58)
Matsushita Electric Trading Co., Ltd.
P.O. Box 288, Central Osaka Japan

Technics SA-203 Specifications

General

Frequency Response	20Hz to 20kHz
Input Sensitivity	2.5mV (MM), 150mV (line)
Tuning range	FM, MW
Total Harmonic Distortion	0.04%
Speaker load impedance	8 ohms

Summary

Technical Data

Amplifier Specifications

Detailed technical specifications for the amplifier section.

FM Tuner Specifications

Detailed technical specifications for the FM tuner section.

Location of Controls

Technical Guide

Power Switch Muting Operation

Explains muting during power on and off for shock noise prevention.

Speaker Short Protection Circuit

Details the protection circuit's response to speaker terminal short circuits.

Disassembly Instructions

Cabinet Removal Procedure

Step-by-step guide to detach the main cabinet housing.

Front Panel Removal

Instructions for safely removing the front panel assembly.

Dial Scale Detachment

Procedure to detach the dial scale from the unit.

Peak Power Indicator PCB Removal

Steps to remove the printed circuit board for peak power indicators.

Power Amplifier IC Removal

Detailed instructions for removing the main power amplifier integrated circuit.

Measurements and Adjustments

FM Offset Voltage Adjustment

Procedure for adjusting the FM offset voltage setting.

FM Discriminator Alignment

Steps to align the FM discriminator circuit for optimal performance.

FM Muting Level Adjustment

Procedure for adjusting the FM muting sensitivity level.

AMFM Alignment Procedures

Comprehensive guides for aligning AM and FM sections.

FM IF Alignment Steps

Specific alignment steps for the FM Intermediate Frequency circuit.

FM Stereo Decoder Alignment

Procedures for aligning the FM stereo decoder for accurate stereo signals.

FM Muting Sensitivity Adjustment

How to adjust the FM muting sensitivity level.

Dial Cord Installation Guide

Instructions for correctly installing the dial cord mechanism.

Block Diagram

Circuit Board and Wiring Diagram

Schematic Diagram

Differential Circuit Schematic

Detailed schematic of the differential amplifier section.

Power Amplifier Circuit Schematic

Schematic of the main power amplifier stage.

Power Supply Circuit Schematic

Schematic of the unit's power supply section.

Exploded View

Replacement Parts List