Technics ST-G3

Service Manu
CYUARTZ Synthesizer
FM/AM Stereo Tuner
SPECIFICATIONS
(DIN 45 500)
@ FM TUNER SECTION
Frequency range
Sensitivity
S/N 30 dB
S/N 26 dB
S/N 20 dB
IHF 46 dB stereo quieting sensitivity
Total harmonic distortion
MONO
STEREO
S/N
MONO
STEREO
Frequency response
Alternate channel selectivity
87.50~108.00 MHz
87.525~ 108.00 MHz (+25 kHz shift)
0.95 uV (IHF, usable)
ORDER NO. HAD84122364C9
al
Tuner
ST-G3
Color
(S)...Silver Type
(K)...Black Type
(S) (K)
(S) (K)
(S) (K)
{EX]...Switzerland and
Scandinavia.
[EH]...Holland.
[XA]...Asia, Latin America,
Africa, Middle Near
East and Oceania.
[XL]...Australia.
[PA]...Far East PX.
[PE]...European Military.
[PC]...European Audio Club.
(S) (K)
(S) (K)
(S) (K)
(S) (K)
@ AM TUNER SECTION
Frequency range
(For Europe, South Africa and Australia)
522~1611 kHz (9 kHz-step)
1.0
pV
(75Q)
530~
1610
kHz
(10
kHz-step)
0.9
pV
(750)
(For
Saudi
Arabia
and
others)
0.8 pV (75) 531~1610 kHz (9 kHz-step)
22
BV/7TSQ
530~1610
kHz
(10
kHz-step)
Sensitivity (S/N 20 dB) 20 pV, 290 uV/m
0.09% Selectivity (+9 kHz) 55 dB
0.2% Image rejection at 999 kHz 40 dB
IF rejection at 999 kHz 60 dB
70 dB (76 dB, IHF)
65 dB (71 dB, IHF)
4 Hz~18 kHz, +0.5 dB~ —1.5 dB
@ GENERAL
Output voltage
0.3V (0.6 V IHF)
normal +400 kHz 65 dB Power consumption 9W
Capture ratio 1.0 dB Power supply
Image
rejection
at
98
MHz
55
dB
For
Australia
AC
50
Hz/60
Hz,
240V
IF
rejection
at
98
MHz
90
dB
For
continental
Europe
AC
50
Hz/60
Hz,
220V
Spurious
response
rejection
at
98
MHz
80
dB
For
others
AC
50
Hz/60
Hz,
110V/127V/220V/240V
AM
suppression
55
dB
Dimensions
(WXHXD)
430
X
53
X
245
mm
Stereo
separation
(16-30/32”
X
2-3/32”
x
9-21/32")
1 kHz 50 dB Weight 2.2 kg
10 kHz 40 dB (4.8 Ib.)
Carrier leak
19 kHz —65 dB (—70 dB, IHF) Note:
38
kHz
—45
dB
(-50
dB,
IHF)
Total
harmonic
distortion
is
measured
by
the
digital
spectrum
Channel balance (250 Hz~6,300 Hz) +1.0 dB analyzer (H.P. 3045 system).
Limiting
point
0.75
wv
eee
;
:
;
Bandwidth Specifications are subject to change without notic for further
IF amplifier 180 kHz uprewemient
FM demodulator 1000 kHz
Antenna terminals
Technics
75Q (unbalanced)
Matsushita Electric Trading Co., Ltd.
P.O. Box 288, Central Osaka Japan
Panasonic. Tokyo
Matsushita Electric Trading Co., Ltd.
1-2, 1-chome, Shibakoen, Minato-ku, Tokyo 105 Japan

Technics ST-G3 Specifications

General

Tuning Range FM	87.5 - 108 MHz
Tuning Scale	Analog
Type	Tuner
Sensitivity AM	20uV (AM)
Signal to Noise Ratio AM	50 dB
Frequency Response	20Hz to 15kHz (FM)
Dimensions	430 x 265 x 90 mm

Summary

Specifications

FM Tuner Section

Detailed technical specifications for the FM tuner section.

AM Tuner Section

Detailed technical specifications for the AM tuner section.

General Specifications

General technical specifications like output voltage, power consumption, dimensions, and weight.

Safety Precautions

Insulation Resistance Test

Procedure to test insulation resistance to prevent electric shock hazards.

Location of Controls

How to Preset Radio Broadcast Frequencies

Guide on presetting FM/AM broadcast frequencies for quick selection.

Disassembly Instructions

Disassembly Procedures

Step-by-step instructions for disassembling the unit, including cabinet, front panel, and PCB.

Measurements and Adjustments

AM-RF Adjustment

Procedure for adjusting the AM radio frequency (RF) stage.

Signal Strength Level Adjustment

Procedure for adjusting the FM signal strength level indicator.

FM Mono Distortion Adjustment

Procedure for adjusting FM mono distortion to minimize distortion factors.

Separation Adjustment

Procedure for adjusting stereo separation to ensure optimal channel separation.

Circuit Board and Wiring Connection Diagram

Circuit Board Layout and Connections

Diagram showing the layout of circuit boards and component connections.

Description of LCD Panel

Function of Terminal (IC901: PD1714 G511)

Detailed description of the function of each terminal pin of the main control IC.

Terminal Guide for Transistors, ICs, and Diodes

Guide to terminals for transistors, integrated circuits, and diodes used in the unit.

Block Diagram

System Block Diagram

Overall system block diagram illustrating signal flow and component interaction.

Schematic Diagram

Electronic Schematic

Detailed electronic schematic diagram of the tuner's circuitry.

Exploded View

Parts Exploded View

Exploded view diagram showing component placement for assembly and repair.