Lg Cm8460 User manual

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

Internal Use Only

NOVEMBER, 2016

MODEL: CM8460 (CM8460, CMS8460F/W)

MODEL: CM8460

(CM8460, CMS8460F/W)

MINI HI-FI SYSTEM

P/NO : AFN77612042

CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ MECHANISM (DM14AA)

SECTION 5 ........ REPLACEMENT PARTS LIST

1-1

SECTION 1

SUMMARY

CONTENTS

SERVICING PRECAUTIONS ............................................................................................................................ 1-3

ESD PRECAUTIONS......................................................................................................................................... 1-5

HIDDEN KEY MODE ......................................................................................................................................... 1-6

SERVICE INFORMATION FOR EEPROM........................................................................................................ 1-7

PROGRAM DOWNLOAD GUIDE...................................................................................................................... 1-8

FOTA UPDATE................................................................................................................................................ 1-11

SPECIFICATIONS ........................................................................................................................................... 1-13

1-2

1-3

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and

impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or

damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason

the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used

for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-

ton swab should be used, taking care not to distort lens.

6) Never attempt to disassemble the pick-up.

Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.

(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much

of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Storage in conductive bag Drop impact

NEVER look directly at the laser beam, and don’t allow

contact with fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

SERVICING PRECAUTIONS

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components

are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components

can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must be

taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magne-

tism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is

because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1 M)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent

static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Resistor

(1 M)Conductive

Sheet

Resistor

(1 M)

Armband

1-4

1-5

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated

circuits and some field-effect transistors and semiconductor chip components. The following techniques should

be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off

any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a

commercially available discharging wrist strap device, which should be removed for potential shock reasons

prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface

such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can

generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD

devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are

ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by

conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the

protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER

SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion

such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate

static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS

INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED

“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF

ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE

SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE

LITERATURE.

ESD PRECAUTIONS

1-6

HIDDEN MODE ENTRANCE KEY EXIT KEY

Version Check Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Remote Control Key ‘ ’ for 1.5 s

EEPROM Initial Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Auto Exit

Option EDIT Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Front ‘Stop’ + Remote Control Key ‘ ’

APD Test Display Front ‘Stop’ + Remote Control Key ‘3’ for 5 s Auto Exit

Clip Front ‘Stop’ + Remote Control Key ‘Mute’ for 5 s Auto Exit

Disc Lock

On/ Off Front ‘Stop’ + Remote Control Key ‘Stop’ for 5 s Front ‘Stop’ + Remote Control Key ‘Stop’ for 5 s

Power Disc Lock

On/ Off

Front ‘Stop’ + Remote Control Key ‘Region EQ’ for 5 s

Front ‘Stop’ + Front ‘Open’ for 5 s

Front ‘Stop’ + Remote Control Key ‘Region EQ’ for 5 s

Front ‘Stop’ + Front ‘Open’ for 5 s

Demo All Key Lock Front ‘Stop’ + Remote Control Key ‘9’ for 5 s Front ‘Stop’ + Remote Control Key ‘9’ for 5 s

Bluetooth Auto Power

On/ Off Front/ Remote Control Key ‘Power’ for 5 s

Front/ Remote Control Key ‘Power’ to SET ‘Power Off’

Child Safe

On/ Off Volume 0 (Min) + Front ‘Enter’ for 3 s Volume 0 (Min) + Front ‘Enter’ for 3 s

HIDDEN KEY MODE

/ /

POWER ON

VFD “NO DISC” status

It is possible at any function.

(ex. It is possible at VFD “NO USB” status, too.)

This is an example.

Front ‘Stop’ + Remote control ‘ ’

push same timing during 5 s

FLD “OP00-…..”

Move to appropriate position

And make changes with remote control

“ , , , REPEAT” key.

Press ‘Stop’ Key

VFD “WRITE OK”

Front ‘Stop’ + Remote control ‘ ’

push same timing during 5 s

VFD “E2P CLR”

Completed

1-7

SERVICE INFORMATION FOR EEPROM

NAME

OPT0

OPT1

OPT2

OPT3

OPT4

OPT5

OPT6

OPT7

OPT8

OPT9

OPT10

OPT11

OPT12

OPT13

OPT14

DETECT NEW EEPROM

(OPTION EDIT SCREEN)

HEX

1. AUDIO PROGRAM

Download program file name must be MICOM_CM8460_YYMMDDX.HEX

If security program(Water Wall) is activated on PC, you must save the file to the USB storage device

and disable the security software, then download the file to your set.

Downloading file proceeds in the same way at USB1 function and USB2 function.

Caution:

When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

NO USB

Insert USB device at USB function.



MICOM UP



FINISH



AUTO POWER OFF

1-8

PROGRAM DOWNLOAD GUIDE

2. CD PROGRAM

Download program file name must be HG690_CM8460_YYMMDDX.bin

If security program(Water Wall) is activated on PC, you must save the file to the USB storage device

and disable the security software, then download the file to your set.

Downloading file proceeds in the same way at USB1 function and USB2 function.

Caution:

When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

NO USB

Insert USB device at USB function.



FIRMWARE



FINISH



AUTO POWER OFF

1-9

3. EQ PROGRAM

Download program file name must be EQ_PRG.BIN

If security program(Water Wall) is activated on PC, you must save the file to the USB storage device

and disable the security software, then download the file to your set.

Downloading file proceeds in the same way at USB1 function and USB2 function.

Caution:

When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

NO USB

Insert USB device at USB function.



EQ UP



FINISH



AUTO POWER OFF

1-10

1-11

FOTA UPDATE

Step1. App Connecting

After connecting the bluetooth APP with SET,

the user could ﬁnd the “Device Version info”

on Setting tab.

Step3. Select update button

When touch the UPDATE button, user could

update the SET ﬁrmware using FOTA.

Step2. Device version info

When touch the “Device Version info” button,

user could ﬁnd the current and latest SET

version on pop-up menu.

Step4. Download from CDN server

Step1 is download from CDN server to smart

phone. The progress bar is displayed on

bluetooth APP.

1-12

Step5. Transfer FW

After completed the download from server,

smart phone start to transfer the ﬁrmware to

the SET. The progress bar is displayed on

bluetooth APP.

Step7. FOTA complete

When ﬁnishing the ﬂash memory writing,

pop-up message about ﬁnish is displayed and

the SET auto power off.

Step6. FW ﬂash writing

After completed the download from the smart

phone, the SET overwrite the ﬁrmware to

ﬂash memory.

SPECIFICATIONS

1-13

GENERAL

Power requirements Refer to the main label on the unit.

Power consumption Refer to the main label on the unit.

Networked standby : 0,5 W (If all network ports are activated.)

Dimensions (W x H x D) Approx. 450 mm x 160 mm x 355 mm

Net Weight Approx. 6 kg

Operating temperature 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity 60 %

INPUTS

Analog audio in (AUX IN) 2,0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)

Portable in (PORT. IN) 1.2 Vrms (3.5 mm stereo jack) x 1

Microphone (MIC 1/2) Sensitivity 20 mV (1 kHz), 6.3 mm jack x 2

TUNER

FM Tuning Range 87,5 to 108.0 MHz or 87,50 to 108,00 MHz

SYSTEM

Frequency Response 40 to 20,000 Hz

Signal-to-noise ratio More than 75 dB

Dynamic range More than 80 dB

Bus Power Supply (USB) 5 V 500 mA

AMPLIFIER (RMS Output power)

Total output 2,750 W

HIGH 555 W X 2 (6 Ωat 5 kHz, 25 % THD)

MID 555 W X 2 (6 Ωat 1 kHz, 25 % THD)

LOW 530 W X 2 (6 Ωat 70 Hz, 25 % THD)

FRONT SPEAKER

Type HIGH : 2 Way 2 Speaker

MID : 1 Way 1 Speaker

Impedance HIGH : 6 Ω

MID : 6 Ω

Rated Input power HIGH : 555 W

MID : 555 W

Max. Input power HIGH : 1,110 W

MID : 1,110 W

Net Dimensions (W x H x D) Approx. 321 mm x 454 mm x 301 mm

Net Weight Approx. 9.7 kg

SUBWOOFER

Type 1 Way 1 Speaker

Impedance 6 Ω

Rated Input Power 530 W

Max. Input power 1060 W

Net Dimensions (W x H x D) Approx. 325 mm x 454 mm x 302 mm

Net Weight 9.5 kg

Design and specifications are subject to change without notice.

1-14

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS ......................................................................................................................................... 2-3

1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-3

2. MECHANISM DECK SECTION (DM14AA) .............................................................................................. 2-5

3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

4. SPEAKER SECTION ................................................................................................................................ 2-8

2-1