Technics SA-GX230

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AV Control Stereo Receiver
Service Manual
ORDER NO. AD9206177C2
Receiver
SA-GX230
Colour
Area
SPECIFICATIONS (DIN 45 500)
lI AMPLIFIER SECTION
Power output
DIN 1 kHz (T.H.D. 1%) 2x80 W (4 Q)
40 Hz~20 kHz continuous power output
both channels driven 2x50 М (80)
Total harmonic distortion.
rated power at 40 Hz~20 kHz - : 0.5% (8 О)
half power at 1 kHz
Intermodulation distortion
rated power at 60 Hz: 7 kHz—4:1, SMPTE
Power bandwidth
both channels driven, —3 dB
0.5% (8 О)
10 Н2--40 kHz (8 О)
Damping factor 40 (8 Q)
Input sensitivity and Impedance :
PHONO 3 mV/47 КО
CD, VCR 1 200 mV/22 КО
. VCR2, TAPE . 200 mV/22 kQ
PHONO maximum input voltage (1 kHz, AMS): 150 mV
S/N at rated power (8 ©) .
70 dB (ІНЕ, А: 80 dB)
РНОМО
CD, VCR 1 80 dB (IHF, A:90 dB)
VCR 2, TAPE 80 dB (IHF, A:90 dB)
Frequency response |
РНОМО RIAA standard curve
| +0.8 dB (30 Hz~15 kHz)
CD, VCR 1 10 Hz~40 kHz (+3 dB)
VCR 2, TAPE 10 Hz~40 kHz (+3 dB)
Tone controls |
Bass . 50 Hz, +10 dB— —10 dB
Treble 20 kHz, +10 dB— — 10 dB
Loudness control (volume at —30 dB) 50 Hz, +9 dB
Output voltage
VCR 1 OUT 200 mV
TAPE REC (OUT) 200 mV
Channel balance, 250 Hz~6.3 kHz +1 dB
Channel separation - . 55 dB
Headphones output level and impedance 430 mV/330 Q
Load impedance
40-160
80—16 Q
А ог В
А апа В
Technics
0.03% (8 Q) .
Suffix for
E ж
(ЕС) Germany and Italy. (К) (5)
ll FM TUNER SECTION
Frequency range
Sensitivity
SIN 30 dB .1.5 uV (75 Q)
SIN 26 dB 1.3шУ (75 О)
SIN 20 ав _ | 1.2uV (75 О)
IHF usable sensitivity 1.5 uV (IHF'58, 75 О)
ІНЕ 46 dB stereo quieting sensitivity . 22 uV/75 О
Total harmonic distortion
MONO . 0.2%
STEREO | 0.3%
S/N m ; cd
MONO 60 dB (75 dB, IHF)
STEREO 58 dB (71 dB, IHF)
Frequency response
20 Hz~15 kHz, +1 dB— —2 dB
Alternate channel selectivity i
87.50~108.00 MHz -
+400 kHz 65 dB -
Capture ratio 1.0 dB
Image rejection at 98 MHz 40 dB
IF rejection at 98 MHz 70 dB
Spurious response rejection at 98 MHz 70 dB
AM suppression 50 dB
Stereo separation
_1kHz -— 40 dB
Carrier leak
19 kHz —55 dB (—60 dB, IHF)
38 kHz —50 dB (—55 ав, ІНЕ)
Channel balance (250 Н2--6.3 06 + 1.5 ав
Limiting point 1.2 uV
Bandwidth
IF amplifier 180 kHz
FM demodulator 1000 kHz
Antenna terminals 75 О (unbalanced)

Technics SA-GX230 Specifications

General

Input Sensitivity	2.5mV (MM), 200mV (line)
Tuning range	FM, MW
Speaker load impedance	8Ω to 16Ω
Frequency Response	20Hz to 20kHz
Signal-to-Noise Ratio	90dB (line)
Dimensions	430 x 130 x 310 mm (W x H x D)

Summary

Specifications Overview

Amplifier Section Specifications

Detailed specifications for power output, distortion, sensitivity, and tone controls of the amplifier section.

FM Tuner Section Specifications

Covers FM tuner frequency range, sensitivity, selectivity, image rejection, and distortion parameters.

AM Tuner Section Specifications

Lists AM tuner frequency range, sensitivity, selectivity, and image rejection for different regions.

General and Transmitter Specifications

Includes power consumption, dimensions, weight, and remote control transmitter details.

Unit Connections and Controls

Rear Panel Terminals and Functions

Explanation of all input/output connectors and controls found on the rear panel of the receiver.

Front Panel Controls and Functions

Guide to the buttons, indicators, and displays on the front panel for operation.

Remote Control Operation Guide

Instructions on how to use the remote control transmitter to operate various receiver functions.

Maintenance and Troubleshooting

Disassembly Instructions

Step-by-step procedures for safely dismantling the unit, including component removal.

Internal Component Removal Procedures

Detailed steps for removing specific internal PCBs and components like volume, tuner, and power supply.

Measurements and Adjustment Procedures

Guidelines for measuring electrical characteristics and performing adjustments, particularly for the FM section.

Block Diagram and Schematic Diagrams

Visual representation of the receiver's signal flow and detailed electronic circuit schematics.

Component and Parts Information

Wiring Connection Diagram

Illustrates the internal wiring connections between various printed circuit boards and components.

Component Terminal and Function Guide

Details the pin functions for ICs, transistors, and diodes, and internal connections.

Cabinet Parts Location and Replacement Parts

Visual guide to cabinet parts and a comprehensive list of replaceable components with part numbers.

Resistors and Capacitors Details

Specific listing of resistors and capacitors with their values, part numbers, and remarks.

Packaging Information

Information on packaging materials and procedures, including battery installation for the remote control.