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LG CM9750 - Service Manual

LG CM9750
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SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
Website http://biz.lgservice.com
JULY, 2015
MODEL: CM9750 (CM9750, CMS9750F)
MODEL: CM9750
(CM9750, CMS9750F)
MINI HI-FI SYSTEM
P/NO : AFN77277023

Other manuals for LG CM9750

Questions and Answers

LG CM9750 Specifications

General IconGeneral
Type-
Cassette deckNo
Product colorBlack
Number of decks1 deck(s)
Disc loading typeTray
Optical disc playerYes
Number of optical discs1 discs
Speaker type3-way
RMS rated power- W
Woofer diameter304.8 mm
Tweeter diameter25.4 mm
Number of speakers2
Mid-range driver diameter165.1 mm
Subwoofer driver diameter (imperial)12 \
Tuner typeDigital
FM band range87.5 - 108 MHz
Supported radio bandsFM
Headphone connectivity3.5 mm
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.
Microphone connectivity6.3 mm
Apple docking compatibilityNot supported
Disc types supportedCD, CD-R, CD-RW
Playback disc formatsCD audio
Audio formats supportedMP3, WMA
Volume controlRotary
Equalizer modesBass, Classic, Jazz, Pop, Rock
Power sourceAC
Weight and Dimensions IconWeight and Dimensions
Main unit weight6600 g
Main unit dimensions (WxDxH)450 x 355 x 160 mm

Summary

SECTION 1 SUMMARY

SERVICING PRECAUTIONS

Detailed guidelines for safe and proper handling of the unit and its components.

ESD PRECAUTIONS

Measures to prevent damage to electronic components from electrostatic discharge.

HIDDEN KEY MODE

Special key combinations for accessing hidden functions and modes.

SERVICE INFORMATION FOR EEPROM

Procedures for accessing and modifying EEPROM data for service purposes.

PROGRAM DOWNLOAD GUIDE

Instructions for downloading firmware updates via USB storage devices.

FOTA UPDATE

Step-by-step guide for performing Over-The-Air (FOTA) firmware updates.

SPECIFICATIONS

Technical details and performance characteristics of the audio system.

SECTION 2 CABINET & MAIN CHASSIS

EXPLODED VIEWS

Visual breakdown of the unit's components and their assembly.

MECHANISM DECK SECTION

Detailed diagram of the CD mechanism and its parts.

PACKING ACCESSORY SECTION

Illustration of included accessories and packaging materials.

SPEAKER SECTION

Diagram showing the physical structure of the speaker units.

SECTION 3 ELECTRICAL

ONE POINT REPAIR GUIDE

Step-by-step troubleshooting for common no-power and no-sound issues.

ELECTRICAL TROUBLESHOOTING GUIDE

Flowcharts for diagnosing power supply and system component failures.

WAVEFORMS OF MAJOR CHECK POINT

Visual reference of expected signal waveforms for key ICs.

WIRING DIAGRAM

Overview of internal connections between major modules of the system.

BLOCK DIAGRAMS

High-level functional representation of system modules and signal flow.

CIRCUIT DIAGRAMS

Detailed schematic diagrams of various circuit sections like SMPS and Main.

CIRCUIT VOLTAGE CHART

Table listing measured voltages for capacitors and connectors.

PRINTED CIRCUIT BOARD DIAGRAMS

Top and bottom view layouts of the SMPS, Main, and Front PC boards.

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