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Yamaha CX-2000 Service Manual

Yamaha CX-2000
38 pages
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Yamaha CX-2000 Specifications

General IconGeneral
TypePreamplifier
Input Sensitivity150 mV
Total Harmonic Distortion (THD)0.003%
Input Impedance47kOhms (line)
Channel separation80dB (20Hz - 20kHz)

Summary

Service Information and Safety Precautions

Critical Component Handling

Information on components requiring specific characteristics for replacement.

Leakage Current Testing Procedure

Procedure and requirements for verifying insulation and measuring leakage current.

Polarization Safety Feature

Explanation of the polarized AC line plug safety feature for U.C. models.

Front Panel Views and Controls

CX-1000U/C/G Front Panels

Diagrams and layout of the front panels for CX-1000U, U, C, and G models.

CX-1000 A/B/R Front Panels

Diagrams and layout of the front panels for CX-1000 A, B, and R models.

CX-2000 Front Panel

Diagram and layout of the CX-2000 front panel.

Remote Control Units Overview

Diagrams of the RS-CX1000 and RS-CX2000 remote control units.

CX-1000/U Rear Panel Configurations

CX-1000/U U, C Models Rear Panel

Diagram of the rear panel for CX-1000/U U and C models.

CX-1000/U A Model Rear Panel

Diagram of the rear panel for CX-1000/U A model.

CX-1000/U B Model Rear Panel

Diagram of the rear panel for CX-1000/U B model.

CX-1000/U G Model Rear Panel

Diagram of the rear panel for CX-1000/U G model.

CX-1000/U R Model Rear Panel

Diagram of the rear panel for CX-1000/U R model.

CX-2000 Rear Panel Details

Technical Specifications

Performance Specifications Summary

Covers input sensitivity, max input signal, output level, frequency response, RIAA, THD, IMD, S/N.

Tone, Filter, and Loudness Features

Details on tone controls, filter characteristics, and continuous loudness control.

Power, Dimensions, and Weight

Information on power supply, consumption, AC outlet, physical dimensions, and unit weight.

Internal Component Layouts

Power Transformer and Circuit Boards

Diagrams identifying the power transformer and various circuit boards.

Digital and Analog Circuitry

Layouts showing the placement of digital and analog processing circuitry.

Physical Dimensions

CX-1000/U Dimensions

Diagrams showing the physical dimensions of the CX-1000/U unit.

CX-2000 Dimensions

Diagrams showing the physical dimensions of the CX-2000 unit.

CX-1000/U Disassembly Procedures

Removing Bottom and Top Covers

Step-by-step instructions for removing the bottom and top covers.

Front Panel and Shield Plate Removal

Instructions for removing the front panel and shield plate.

CX-2000 Disassembly Steps

CX-2000 Cover and Panel Removal

Steps for removing the bottom cover, top panels, and front panel.

CX-2000 Shield and Side Panel Removal

Instructions for removing the shield plate and side panels.

Adjustment Procedures and Specifications

Distortion Degree Adjustment

Procedure for adjusting the distortion degree of the amplifier circuit.

Amplifier Offset Adjustment

Procedure for adjusting the offset of the amplifier part.

D/A Converter Output Level

Procedure for adjusting the output level of the D/A converter.

Integrated Circuit (IC) Block Diagram

IC433 Micro Computer Details

Block diagram and pinout for the IC433 microcomputer (LC6554H-3709).

Key Integrated Circuits

D/A Converters and Op-Amps

Diagrams for PCM56P-K D/A converters and NJM5532 dual op-amps.

Regulators and Decoder ICs

Diagrams for AN7812/AN7912 regulators and μPD74HC238C decoder.

Additional Integrated Circuit Functions

Regulators and Logic Gates

Diagrams for NJM78M12A regulators and TC74HC08 logic gates.

LED Driver and Sample Hold ICs

Diagrams for LB1294 LED driver and YM3023 sample hold ICs.

Digital Signal Processing ICs

Data Selectors and Digital Filters

Diagrams for μPD74HC151C data selectors and YM3414 digital filters.

Logic and Control ICs

Inverters, Single Shots, and Logic Gates

Diagrams for μPD74HCU04C inverters, μPD74HC123AC single shots, and NAND/NOR gates.

Over Sampling and Control ICs

Diagrams for YM6013 over sampling and NJM7805A regulator ICs.

Digital Input/Output IC

YM3623B Digital I/O Functions

Diagram and explanation of YM3623B digital I/O functions and pin assignments.

Peripheral and Interface ICs

Multiplexers and Motor Drivers

Diagrams for μPD74HC157C multiplexer and BA6209 motor driver ICs.

Video, Op-Amps, and Remote Control ICs

Diagrams for LA7952 video switch, NJM5532DD op-amp, and U701 remote control ICs.

System Block Diagram

Signal Path and Control Flow

High-level block diagram showing signal flow and control logic.

Digital and Power Management Blocks

Blocks related to digital processing, power supply, and output stages.

Printed Circuit Board Layouts

Equalizer Circuit Board 1 and 3

Layout diagrams for Equalizer Circuit Boards (1) and (3).

Additional PCB Layout Diagrams

Equalizer Circuit Boards 4-12

Layout diagrams for Equalizer Circuit Boards (4) through (12).

Digital Circuit Boards 2-4

Layout diagrams for Digital Circuit Boards (2), (3), and (4).

Further PCB Layout Details

Equalizer Circuit Boards 2, 9-12

Layout diagrams for Equalizer Circuit Boards (2) and (9) through (12).

Digital Circuit Boards 3, 4

Layout diagrams for Digital Circuit Boards (3) and (4).

Digital Circuit Board Layouts

DIGITAL Circuit Board 1 Layout

Layout diagram for DIGITAL Circuit Board (1) pattern and component sides.

More Printed Circuit Board Layouts

Digital Circuit Board 2 Layout

Layout diagram for DIGITAL Circuit Board (2).

Analog Circuit Board 2 Layout

Layout diagram for ANALOG Circuit Board (2).

Analog Circuit Board Layouts

ANALOG Circuit Board 1 Layout

Layout diagram for ANALOG Circuit Board (1) pattern side.

Overall Schematic Diagram

Component Identification and References

List of components used in the schematic diagram with references.

Detailed Schematic Diagrams

Signal Paths and Component Locations

Schematic detailing signal paths and component locations.

Component Reference Guide

Guide for identifying various electronic components used in the unit.

Wiring Diagrams and Connections

Digital and Analog Board Wiring

Diagrams showing wiring between digital, analog, and equalizer boards.

Equalizer Board Interconnections

Wiring diagrams illustrating connections between equalizer boards.

Electrical Parts List

Component Part Number Reference

List of electrical components with part numbers and descriptions.

Component Parts Inventory

Transistors, Diodes, and ICs

List of transistors, diodes, and integrated circuits with part numbers.

Connectors and Other Parts

List of connectors, jacks, and other miscellaneous components.

Component Listings

Capacitors, Coils, and Resonators

List of ceramic caps, electrolytic caps, coils, and resonators.

Potentiometers and Miscellaneous Parts

List of potentiometers, heat sinks, and other components.

Parts Reference List

ICs, Diodes, Transistors, and Switches

List of ICs, diodes, transistors, and switches with part numbers.

Miscellaneous Components

List of transmission modules, switches, terminals, and connectors.

Circuit Board and Capacitor Parts

Equalizer Circuit Boards and Capacitors

List of equalizer circuit boards and various types of capacitors.

Coils and Other Components

List of coils, electrolytic capacitors, and ceramic capacitors.

Miscellaneous Parts Listing

Transformers, Fuses, Relays, and Resistors

List of transformers, fuses, relays, and various resistors.

LEDs, Switches, and Semiconductors

List of LEDs, switches, transistors, diodes, and ICs.

Mechanism Exploded View (CX-2000)

Main Chassis and Panel Components

Exploded view of the main chassis and panel components.

Internal Mechanism Parts Identification

Identification of internal mechanism parts in the exploded view.

Mechanism Component List

Panels, Frames, and Dampers

List of mechanism parts including panels, frames, and dampers.

Electronic Components and Fasteners

List of electronic components, screws, and rivets for the mechanism.

Circuit Boards and Accessories

List of circuit boards, cord stoppers, and power cords for the mechanism.

Mechanism Parts Inventory

Transformers, Switches, and LEDs

List of mechanism parts including transformers, switches, and LEDs.

Transistors, ICs, and Connectors

List of mechanism transistors, ICs, and connectors.

Remote Control Transmitter Details

Remote Control Schematic Diagram

Schematic diagram for the RS-CX1000/2000 remote control transmitter.

Remote Control PCB Layout

Printed circuit board layout for the remote control transmitter.

Remote Control Exploded View

Remote Control Housing and Components

Exploded view of the remote control transmitter's housing and components.

Carbon Resistor Parts List

Carbon Resistor Values and Part Numbers

List of carbon resistors by value, including 1/4W and 1/6W part numbers.

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