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LG CM2760 Service Manual

LG CM2760
50 pages
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SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
JANUARY, 2016
MODEL: CM2760 (CM2760, CMS2760F)
MODEL: CM2760
(CM2760, CMS2760F)
Micro Hi-Fi Audio
P/NO : AFN77360055

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LG CM2760 Specifications

General IconGeneral
TypeHome audio micro system
Product colorBlack
Optical disc playerNo
Impedance4 Ω
Speaker type2-way
Frequency range80 - 20000 Hz
RMS rated power160 W
Number of speakers2
Built-in speaker(s)-
Signal-to-Noise Ratio (SNR)80 dB
Total Harmonic Distortion (THD)10 %
Supported radio bandsFM
Radio Data System (RDS)Yes
Display typeLCD
Headphone connectivity3.5 mm
USB 2.0 ports quantity1
Apple docking compatibilityiPad, iPhone, iPod
Audio formats supportedFLAC, MP3, WAV
Equalizer modesClassic, Jazz, Pop, Rock
Power sourceAC
Input voltage220-240 V
Input frequency50 - 60 Hz
Power consumption (standby)0.5 W
Power consumption (typical)45 W
Weight and Dimensions IconWeight and Dimensions
Main unit weight2200 g
Main unit dimensions (WxDxH)170 x 230 x 276 mm

Summary

Section 1: Summary

Servicing Precautions

Guidelines for safe and proper handling and repair of the product.

ESD Precautions

Measures to prevent damage from electrostatic discharge to sensitive components.

Hidden Key Mode

Accessing special functions or diagnostic modes using specific button sequences.

Software Update Guide

Instructions for updating the product's firmware via a USB device.

Specifications

Technical details and performance characteristics of the audio system.

Section 2: Cabinet & Main Chassis

Cabinet and Main Frame Section Exploded View

Visual breakdown of the unit's internal structure and components.

Packing Accessory Details

Details on how accessories and the unit are packaged for shipping.

Speaker Section Details

Diagrams and information related to the speaker units.

Section 3: Electrical

One Point Repair Guide

Troubleshooting guide for common single-point failure issues.

Audio Part Electrical Troubleshooting

Systematic steps to diagnose and repair audio-related electrical faults.

CD Part Electrical Troubleshooting

Steps to diagnose and repair faults within the CD playback mechanism.

Major Check Point Waveforms

Illustrations of expected signal waveforms at critical test points for diagnostics.

Wiring Diagram

Schematic showing connections between internal components and PCBs.

Block Diagram

High-level overview of the system's functional blocks and their interconnections.

Circuit Voltage Chart

Table listing expected voltage levels at various connector pins for troubleshooting.

Printed Circuit Board Diagrams

Layouts of the main printed circuit boards (Top and Bottom views) for component identification.

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