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LG CJ87 User Manual

LG CJ87
85 pages
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SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
FEBRUARY, 2017
MODEL: CJ87 (CJ87, CJS87F)
MODEL: CJ87
(CJ87, CJS87F)
MINI HI-FI SYSTEM
P/NO : AFN77612162

Table of Contents

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LG CJ87 Specifications

General IconGeneral
KaraokeYes
Impedance6 Ω
RMS rated power2350 W
Number of speakers2
Subwoofer driver diameter (imperial)8 \
Apple dockingNo
Audio (L/R) in1
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
FM band range87.5 - 108 MHz
MW band range520 - 1710 kHz
Supported radio bandsAM, FM, PLL
Equalizer modesClassic, Jazz, Pop, Rock, Standart
Power sourceAC
Input voltage110 - 230 V
Input frequency50 - 60 Hz
Power consumption (standby)0.5 W
Power consumption (typical)250 W
Type-
Product colorBlack
Number of optical discs1 discs
Audio formats supportedMP3, WMA

Summary

General Information and Precautions

Servicing Precautions

Guidelines for handling and servicing to prevent damage or injury.

ESD Precautions

Procedures to prevent damage to electronic components from static electricity.

Hidden Key Mode Operations

Table and description of special key combinations for diagnostic modes.

EEPROM Service Information

Procedure for accessing and modifying EEPROM settings.

Program Download Guide

Steps for downloading firmware via USB for audio and other programs.

FOTA Update via Bluetooth App

Guide for updating firmware wirelessly using a Bluetooth app.

System Specifications

Technical specifications for the Mini Hi-Fi System.

Cabinet and Main Chassis Assembly

Exploded Views

Detailed diagrams showing the breakdown of chassis components.

Disassembly Instructions

Step-by-step guide for taking apart the unit's chassis.

Electrical System and Troubleshooting

One Point Repair Guide

Guides for diagnosing and fixing common electrical problems.

Electrical Troubleshooting Guide

Systematic approach to diagnosing electrical faults in the system.

Major Check Point Waveforms

Examples of oscilloscope waveforms for key test points.

Wiring Diagram

Diagram illustrating electrical connections between major units.

Block Diagram

High-level functional overview of the system's architecture.

Circuit Voltage Chart

Table of expected voltage readings at various circuit points.

Printed Circuit Board Diagrams

Layout diagrams for various printed circuit boards.

Deck Mechanism (DM14B) Disassembly and Exploded View

Deck Mechanism Disassembly

Step-by-step instructions for disassembling the deck mechanism.

Deck Mechanism Exploded View

Illustrated breakdown of the deck mechanism parts.

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