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Kenwood RXD-251 User Manual

Kenwood RXD-251
37 pages
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MINI HiFi COMPONENT SYSTEM
RXD-251/301/301E/301W/
RXD-351/351E/351W/371S/A3
SERVICE MANUAL
© 1998-7/B51-5454-00 (K/K) 3763
(XD-251~A3)**
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
**Refer to page 2 if you want to know system configuration.
KENWOOD-Crop. certifies this equipment conforms to DHHS
Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM
Panel(CD) *
(A60-)
Front glass *
(A29-)
Knob *
(K29-)
Knob
(K29-7512-08)
Knob
(K29-7519-08)
Knob
(K29-7518-08)
Phone jack
(E11-0386-08)
Konb
(K-29-7516-08)
Cassette lid(R) *
(A53-)
Front glass(R)
(B10-3451-08)
Front panel *
(A60-)
Knob *
(k29-)
Knob
(K29-7523-08)
Knob
(K29-7522-08)
Knob
(K29-7521-08)
Cassette lid(L) *
(A53-)
Front glass(L)
(B10-3450-08)
Knob
(K29-7515-08)
Knob
(K29-7511-08)
Mic jack
(E11-0387-08)
Knob *
(K29-)
Knob *
(K29-)
Knob
(K29-7513-08)
Illust. is RXD-351.
* Refer to parts list on page 38.
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Kenwood RXD-251 Specifications

General IconGeneral
TypeStereo System
Output Power40W per channel
CD PlayerYes
TunerFM/AM
Tape DeckYes
Remote ControlYes
Frequency Response20Hz - 20kHz
FunctionsCD, Tuner, Tape Deck

Summary

Service Manual Overview

Component Identification

Diagram illustrating front panel controls and components.

Laser Safety Warning

Critical warning regarding laser radiation exposure when the unit is open.

System Accessories and Cautions

Included Accessories

Lists and illustrates accessories like antennas, remote control, and batteries.

Microcomputer Reset Procedure

Steps to reset the microcomputer to restore normal operation.

External View and Connections

Rear Panel Connectivity

Diagram showing external connection terminals on the rear panel.

Unit Controls

Remote Control Operations

Details the functions of the remote control unit buttons.

Main Unit Front Panel Controls

Explains the buttons and knobs on the main component unit.

Cassette Deck and Display

Cassette Deck Unit Controls

Describes buttons for cassette playback, recording, and tape handling.

Front Panel Display Indicators

Explains the various indicators and readouts on the unit's display.

System Block Diagram

Functional Block Overview

Illustrates the interconnections between major internal units like Tuner, CD, and Audio.

Circuit Description - Microprocessor

Microprocessor Pinout and Functions

Details the pin assignments and functions of the main microprocessor (IC601).

Circuit Description - System Logic

Microprocessor I/O and Modes

Describes microprocessor output signals, modes, and interface signals.

CD Mechanism Operation

Disc Loading and Playback

Explains the mechanical process for disc insertion and playback initiation.

Tray Mechanism

Describes the operation of the disc tray open/close mechanism.

CD Mechanism Maintenance

Pickup Replacement Procedure

Step-by-step guide for replacing the CD pickup assembly.

Adjustment Procedures - Tuner

FM Section Alignment

Details the alignment steps for the FM tuner section.

Adjustment Procedures - SW and Testing

SW Section Alignment

Outlines the alignment steps for the SW tuner section.

Test Instrument Setup

Illustrates how to connect measurement instruments for alignment.

Adjustment Procedures - Cassette Deck

Demagnetization and Cleaning

Procedure for demagnetizing and cleaning the tape heads and capstan.

Head Azimuth and PC Board Adjustments

Steps for adjusting head azimuth, tape speed, and playback levels.

Adjustment Procedures - CD Player

Laser Power Adjustment

Procedure for adjusting the laser diode power output.

Focus Error Bias Adjustment

Steps for adjusting the focus error bias for optimal disc reading.

System Wiring Diagram

Tuner and CD Mecha Wiring

Shows the wiring connections for the tuner and CD mechanism units.

Audio, Display, and Power Wiring

Illustrates wiring for audio, display, and power supply sections.

Parts Description - Component Coding

Capacitor Value and Temperature Coding

Explains how to interpret capacitor part numbers and codes.

Resistor Coding and Dimensions

Details resistor coding for type, value, tolerance, and wattage.

PC Board Layouts - Tuner Unit

Tuner Unit Component Layout (K1P1Y1M1X1X2M3X3)

Component placement diagram for the Tuner Unit variant.

Tuner Unit Component Layout (E1T1Q1E2T2Q2E3E4)

Component placement diagram for another Tuner Unit variant.

PC Board Layouts - Tuner Unit (RXD-371S)

Tuner Unit Component Layout (RXD-371S M2)

Component placement diagram for the RXD-371S Tuner Unit.

PC Board Layouts - Audio Unit

Audio Unit Component Layout

Component placement diagram for the Audio Unit.

PC Board Layouts - Display Unit

Display Unit Component Layout

Component placement diagram for the Display Unit.

Schematic Diagrams - Tuner Unit (Part 1)

Tuner Unit (RXD-351, etc.) Schematic

Detailed circuit diagram for specific Tuner Unit configurations.

Schematic Diagrams - Tuner Unit (Part 2)

Tuner Unit (RXD-301, etc.) Schematic

Continuation of the Tuner Unit circuit diagram for other variants.

Schematic Diagrams - CD and Peripherals

CD Mecha, Switch, Motor Unit Schematics

Circuit diagrams for the CD mechanism, switch boards, and motor unit.

Schematic Diagrams - Power and Control

Power, CD Control, Sensor Unit Schematics

Circuit diagrams for power supply, CD control, and sensor units.

Schematic Diagrams - Cassette and Display

Cassette Deck, Sensor, Display Unit Schematics

Circuit diagrams for the cassette deck, sensor PCB, and display unit.

Exploded View - Main Unit

Unit Assembly Breakdown

Visual representation of the main unit's components and their assembly.

Parts List - Chassis and Panels

Cabinets, Panels, and Holders

Lists part numbers for chassis components, panels, and holders.

Parts List - Buttons and Knobs

Cassette Deck Buttons and Knobs

Lists part numbers for cassette deck buttons and control knobs.

Parts List - Knobs and Capacitors

Control Knobs and Capacitors

Lists part numbers for control knobs and various capacitor types.

Parts List - Electronic Components

Capacitors, Coils, and Transistors

Lists part numbers for capacitors, coils, and transistors used in the unit.

Parts List - ICs and Transistors

Integrated Circuits and Transistors

Lists part numbers for integrated circuits and transistors.

Parts List - Capacitors and Transistors

Various Capacitors and Transistors

Lists part numbers for additional capacitors and transistors.

Parts List - ICs, Fuses, and Switches

ICs, Fuses, and Switches

Lists part numbers for integrated circuits, fuses, and switches.

Parts List - Diodes and ICs

Diodes, ICs, and Transistors

Lists part numbers for diodes, ICs, and transistors.

Parts List - LEDs, Speakers, and Readability

LEDs, Speakers, and Other Components

Lists part numbers for LEDs, speakers, and other miscellaneous components.

Parts List Reading Guide

Explains how to interpret the parts list format and abbreviations.

Technical Specifications

Amplifier and Cassette Deck Specifications

Provides technical details for the amplifier and cassette deck sections.

CD Player and General Specifications

Lists specifications for the CD player, power consumption, dimensions, and weight.

Speaker System Specifications

Details the specifications for the included speaker systems.

Kenwood Corporation Information

Global Service and Sales Network

Lists international contact information for Kenwood service and sales.

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