Technics QUARTZ ST-K50

ORDER NO. AD9006162C7
Service Manual
CYUARTZ Synthesizer
AM/FM Stereo Tuner
SPECIFICATIONS
(DIN 45 500)
W@FM TUNER SECTION
Frequency range 87.50 ~ 108.00 MHz (0.05 MHz steps)
Sensitivity 1.5 pV (IHF, usable)
SIN 30 dB 1.3 pV (75 Q)
SIN 26 dB 1.2 pV (75 Q)
SIN 20 dB 0.9 pV (75 Q)
IHF 46 dB stereo quieting sensitivity 28 wV/75 QO
Total harmonic distortion
MONO 0.15%
STEREO 0.3 %
SIN ‘
MONO 70 dB (78 dB, IHF)
STEREO 65 dB (70 dB, IHF)
Frequency response 20 Hz~15 kHz, +0.5 dB~—1.5 dB
Alternate channel selectivity
+400 kHz 55 dB
Capture ratio 1.0 dB
Image rejection at 98 MHz 45 dB
IF rejection at 98 MHz 90 dB
Spurious response rejection at 98 MHz 75 dB
AN suppression 50 dB
Stereo separation
1kHz 40 dB
10 kHz 30 dB
Carrier leak
19 kHz — 30 dB (—35 dB, IHF)
38 kHz —45 dB (—50 dB, IHF)
Channel balance (250 Hz~ 6,300 Hz) +1.5 dB
Limiting point 1.2 pV
Bandwidth
IF amplifier 180 kHz
FM demodulator 1000 kHz
Antenna terminais 75 Q (unbalanced)
‘Technics
Matsushita Electric Industrial Co., Ltd.
Central P.O. Box 288, Osaka 530-91, Japan
Tuner
Color
(K)osclesanciids Black Type
Area
Asia, Latin America,
Middle Near East and
Africa
(K)
Oceania
Far East-PX
WAM TUNER SECTION
Frequency range 531 kHz~1602 kHz (9-kHz steps)
530 kHz~1600 kHz (10-kHz steps)
Sensitivity (S/N 20 dB) 20 pV, 300 pV/m
Selectivity (+9 kHz) (at 999 kHz) 50 dB
Image
rejection
(at
999
kHz)
40
dB
IF rejection (at 999 kHz) 60 dB
Wi GENERAL
Output voltage 0.3 V (0.6 V IHF)
Power consumption 9W
Power supply
For Oceania: AC 50 Hz/60 Hz, 240V
For others: AC 50 Hz/60 Hz, 110 V/127 V/220 V/240 V
Dimensions (W x H x D) 430 x 64« 290 mm
(16-15/16” x 2-17/32” x 11-13/32”)
Weight 2.3kg (5.1 Ib.)
Notes:
1. Specifications are subject to change without notice.
2. Weight and dimensions are approximate.
3. Total harmonic distortion is measured by the digital spectrum
analyzer.
Panasonic Tokyo Sales Department
Matsushita Electric Industriaj Co., Ltd.
World Trade Center Bidg., 4-1, 4amamatsu-cho,
2-chome, Minato-ku, Tokyo 105, Japan

Technics QUARTZ ST-K50 Specifications

General

Tuning Bands	FM, AM
Signal to Noise Ratio (AM)	50 dB
Distortion (FM)	0.15% (Mono), 0.3% (Stereo)
Type	Quartz Synthesizer Tuner
FM Tuning Range	87.5 MHz - 108.0 MHz
AM Tuning Range	530 - 1605 kHz
FM Sensitivity	1.0 µV (IHF)
Frequency Response (FM)	20Hz to 15kHz
Signal to Noise Ratio (FM)	70 dB
Dimensions	430 x 150 x 330 mm

Summary

Specifications

FM Tuner Section

Detailed specifications for the FM tuner performance.

AM Tuner Section

Detailed specifications for the AM tuner performance.

General

General unit specifications including output, power, and dimensions.

Accessories

Connections

Antenna Connections

How to Connect a 75-ohms Coaxial Cable

Step-by-step guide for connecting a coaxial antenna cable.

AM Loop Antenna Installation

Guidance for installing the included AM loop antenna.

Attaching AM Antenna to UnitWallRack

Placement recommendations for the AM loop antenna.

Location of Controls

Front Panel Controls Overview

Describes physical buttons, indicators, and displays on the front panel.

Remote Control Operation

Remote Control Functions

Details operation for tape decks, tuners, CD players, and amplifiers.

Disassembly Instructions

Component Removal Steps

Details the process of removing various unit components.

Measurements and Adjustments

FM Signal Adjustments

Procedures for tuning, distortion, and VCO adjustments.

Front Panel Display Description

Description of the Front Panel (FL) display.

Pin Connections

Technical pinout details for the front panel display.

Schematic Diagrams

Printed Circuit Boards and Wiring Diagram

Visual layout of components and connections on PCBs.

IC, Transistor, Diode Terminal Guide

Identification of key semiconductor pins and functions.

Block Diagram

IC Terminal Functions

Replacement Parts List

Exploded View

Cabinet Parts

List of external chassis components and their identification.

Accessories

List of included add-on items and their part numbers.

Packing Materials

Identification of materials used for shipping and packaging.