Sansui QRX 6001 Receiver Service Manual

Introduction

This document provides comprehensive service information for the Sansui QRX 6001 Receiver. It includes detailed specifications, troubleshooting procedures, parts lists, and schematic diagrams essential for maintenance and repair.

Specifications

Recording Output:

4-CH./2-CH. TAPE-1 REC Pin Jacks: 100mV
4-CH./2-CH. TAPE-2 REC Pin Jacks: 100mV
REC/PLAY DIN Socket: 30mV

Channel Separation (at 1,000Hz):

2-CH. PHONO: better than 50dB
4-CH./2-CH. AUX: better than 50dB

Hum and Noise (IHF):

2-CH. PHONO: better than 70dB
4-CH./2-CH. AUX: better than 80dB

Switches and Controls:

BASS: ±10dB, -10dB at 50Hz
TREBLE: ±10dB, -10dB at 10,000Hz
LOUDNESS: -8dB at 50Hz, -3dB at 10,000Hz

QS Synthesizer/Decoder: QS regular matrix system with QS Vario-matrix circuit

CD-4 Demodulator:

Input Sensitivity: 2.5mV (1 to 10mV adjustable)
Input Impedance: 50kΩ
Separation (standard test signal at 1,000Hz): Left to Right: 40dB, Front to Back: 25dB
Frequency Response (standard test signal at REC output): 30 to 15,000Hz (main-channel)

Semiconductors:

Transistors: 101
FETs: 9
Diodes: 54
Zener Diodes: 8
ICs: 9

Power Requirements:

Voltage: 100, 117, 220, 240V 50/60Hz
Consumption: 190W (rated)

Dimensions: 540mm (21¼") W × 161mm (6⅜") H × 403mm (15⅞") D

Weight: 20.4 Kg (45.0 lbs) net, 23.1 Kg (50.9 lbs) packed

* Design and specifications subject to change without notice for improvements.

A comprehensive table of contents is provided, detailing sections such as Specifications, Block Diagrams, Alignments and Adjustments, Troubleshooting Charts, Parts Location and Lists, Schematic Diagrams for various sections (Tuner, Audio, 4-CH, Power Supply), Packing List, and Accessory Parts List.

Block Diagrams

Block diagrams illustrate the functional relationships between various circuit boards and sections of the receiver, including the Synthesizer, QS, SQ, Tuner, Filter, Tone Control, Amplifier, Protector, and Power Supply circuits.

Alignments and Adjustments

Detailed procedures are provided for aligning and adjusting various sections of the receiver:

Driver Circuit Board Adjustment
FM IF Alignment
FM Dial Calibration and RF Alignment
FM Signal Meter, Mono Distortion and Muting Adjustment
MPX Alignment
AM IF, Dial Calibration and RF Alignment

These procedures often refer to specific test equipment, signal generators, and component adjustments (e.g., VR03, L05, T01).

Troubleshooting

Troubleshooting charts and guides are included to help diagnose and resolve common issues:

Quick acting fuse on F-2427 not opens
Troubleshooting on Power Supply Section
Troubleshooting on Main Circuit Section
Troubleshooting on Tone Control Circuit Section
Troubleshooting on Phono Circuit Section
Troubleshooting on Tuner Circuit Section
No channel separation and stereo indicator not lighted
Signal meter circuit inoperative
AM inoperative

Specific component failures (e.g., defective transistors, diodes, ICs) and their locations on circuit boards are listed.

Parts Location and Parts List

Extensive parts lists are provided for numerous circuit boards, including:

F-1519C FM Frontend Pack
F-1507C Tuner Circuit Board
F-1267 Equalizer Circuit Board
F-2425 Tone Control Circuit Board
F-2431 Power Supply Circuit Board for Tuner Section
F-2436A Driver Circuit Board
F-2475 CD-4 Sub Channel Circuit Board
F-2086 CD-4 Main Circuit Board
F-2087 QS Matrix Circuit Board
F-2088 QS Phase Control Circuit Board
F-1461A Protector Circuit Board
F-2427 Power Supply Circuit Board
F-2428 Filter & Power Supply Circuit Board
F-2423 Filter & Switch Circuit Board

These lists detail component part numbers, stock numbers, descriptions, and positions on the circuit boards.

Schematic Diagrams

Detailed schematic diagrams are provided for the following sections:

Tuner Section
Audio Section
4-CH Section
Power Supply Section

These diagrams illustrate the electrical connections and component layouts for each section.

Component Identification and Diagrams

Various diagrams and lists identify specific components such as transistors (e.g., 2SC930, 2SC1047, 2SD313, 2SA678), diodes (e.g., 1N60, 1N34A), Zener diodes (e.g., EQA01-13R), ICs (e.g., HA1327, HA1328, HD3103P), variable resistors (VR), capacitors (C), inductors (L), and trimmer capacitors (TC).

Assembly and Wiring

Diagrams show the physical layout of components on circuit boards and the overall chassis, aiding in assembly and troubleshooting.

Threading of Dial Cord

Instructions are provided for threading the dial cord, including a diagrammatic representation (Fig. 4-1) and specific steps to ensure proper tension and operation.

Accessories and Packing

Information on packing lists and accessory parts is included.

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