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LG EC290W - User Manual

LG EC290W
78 pages
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SERVICE MANUAL
VIDEO CASSETTE
RECORDER
SERVICE MANUAL
MODELS : EC290W/EC290SW/EC470W/
EC490SW/EC970W/EC990SW
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
EC470W/970W EC290W/290SW/490SW/990SW
MODELS : EC290W/EC290SW/EC470W/EC490SW/EC970W/EC990SWSERVICE MANUAL

Table of Contents

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Summary

SECTION 1 SUMMARY

KEY TO ABBREVIATIONS

Glossary of technical abbreviations used throughout the service manual.

IMPORTANT SAFETY PRECAUTIONS

Precautions during Servicing

Guidelines for safe handling and servicing of the VCR unit.

SAFETY CHECK AFTER SERVICING

Insulation resistance test

Test for electrical safety after repair.

Dielectric strength test

Test for electrical safety after repair.

Leakage Current test

Test for electrical safety after repair.

SERVICE NOTICE ON REPLACING EEPROM

MP KEY

Procedure for initializing EEPROM using MP KEY.

SECTION 2 CABINET & MAIN CHASSIS

SERVICE METHOD

Overview of the service methods for unit disassembly and reassembly.

EXPLODED VIEWS

Cabinet and Main Frame Section

Exploded view of the cabinet and main frame components.

Packing Accessory Section

Exploded view of packing and accessory components.

SECTION 3 ELECTRICAL

ELECTRICAL ADJUSTMENT POINTS ARRANGEMENT

Diagram of electrical adjustment point locations.

ELECTRICAL ADJUSTMENT PROCEDURES

Step-by-step procedures for electrical adjustments.

ELECTRICAL TROUBLESHOOTING GUIDE

Guide for troubleshooting common electrical problems in the VCR.

BLOCK DIAGRAMS

Power Block Diagram

Block diagram of the power supply unit.

Tu;IF, NICAM & A2 Block Diagram

Block diagram for tuner, IF, NICAM, and A2 circuits.

System Block Diagram

Overall system block diagram.

CIRCUIT DIAGRAMS

Power Circuit Diagram

Detailed circuit diagram of the power supply.

Tuner, NICAM, A2 Circuit Diagram

Detailed circuit diagram for tuner, NICAM, and A2.

System Circuit Diagram

Detailed circuit diagram of the system control.

WAVEFORM

IC301 Oscilloscope Waveform

Oscilloscope waveforms for IC301 signals.

IC501 Waveform photographs

Waveform photographs for IC501 signals.

PRINTED CIRCUIT BOARD DIAGRAMS

MAIN P.C.Board

Printed circuit board layout for the main board.

KEY (LEFT) P.C.Board

Printed circuit board layout for the left key board.

SECTION 4 MECHANISM

DECK MECHANISM PARTS LOCATIONS

Visual identification of various parts within the VCR mechanism.

DECK MECHANISM DISASSEMBLY

Detailed instructions for disassembling the VCR deck mechanism.

DECK MECHANISM ADJUSTMENT

Procedures for adjusting various aspects of the VCR mechanism.

MAINTENANCE;INSPECTION PROCEDURE

Procedures for routine maintenance and inspection of the VCR.

Mechanism TROUBLESHOOTING GUIDE

Guide for troubleshooting common VCR mechanism issues.

EXPLODED VIEWS

Front Loading Mechanism Section

Exploded view of the front loading mechanism.

Moving Mechanism Section(1)

Exploded view of the moving mechanism (part 1).

Moving Mechanism Section(2)

Exploded view of the moving mechanism (part 2).

LG EC290W Specifications

General IconGeneral
TypeVCR
Tape TypeVHS
Number of Heads4
TunerYes
Remote ControlYes
Playback FormatsVHS
Recording FormatsVHS
InputsComposite
OutputsComposite

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