LG CM4360 Schematic

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.

MODEL: CM4360 (CM4360, CMS4360F)

MODEL: CM4360

(CM4360, CMS4360F)

MINI HI-FI SYSTEM

Internal Use Only

P/NO : AFN77552430

JULY, 2016

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ 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 & UPDATE GUIDE .................................................................................................. 1-8

SPECIFICATIONS ............................................................................................................................................. 1-9

1-2

SERVICING PRECAUTIONS

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.

Storage in conductive bag

Drop 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.

NEVER look directly at the laser beam, and don’t allow contact with fingers or other exposed skin.

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

Pressure

Magnet

How to hold the pick-up

Cotton swab

Conductive Sheet

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.

1-3

Pressure

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 magnetism 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.

Armband

Resistor (1 M)

Conductive Sheet

1-4

ESD PRECAUTIONS

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.

1-5

HIDDEN KEY MODE

Push both Display key and Remote Control key to activate it for 5 seconds.

1. Disc Lock On/Off (CD Function Only Active)

 Display Key : PLAY/PAUSE  Remote Control Key : STOP

2. Check Version and Option code

 Display Key : PLAY/PAUSE  Remote Control Key : PLAY/PAUSE  You can change [Audio MCU Version <-> Audio EQ Version <-> EEPROM Option] by SKIP+/-.

3. Clear EEPROM

 Display Key : PLAY/PAUSE  Remote Control Key : SKIP-

4. Edit EEPROM

 Display Key : PLAY/PAUSE  Remote Control Key : SKIP+  You can edit 0~f by Sound Effect or STOP key.

5. Amp Clip On/Off

 Display Key : PLAY/PAUSE  Remote Control Key : Mute  Amp Clip Mode Change (Amp Clip On --> Amp Clip).

1-6

SERVICE INFORMATION FOR EEPROM

POWER ON

FLD no disc status or AUX status.

Display ‘Play/Pause’ + Remote Control ‘Forward skip’

push same timing during 5 seconds.

FLD ‘OP00-00’

Move to appropriate position and make changes

with remote control ‘skip, sound effect, stop’ key.

Press ‘PLAY/PAUSE’ key.

FLD ‘write ok’

Display ‘Play/Pause’ + Remote Control ‘Forward skip’

push same timing during 5 seconds.

FLD ‘E2P CLR’

Completed

1-7

PROGRAM DOWNLOAD & UPDATE GUIDE

Caution:

• When downloading the ﬁ le, 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.

If security program (Water Wall) is activated on your PC, you must save the ﬁ le to the USB storage device and disable the security software, then download the ﬁ le to your set.

1. Main Program

1) File name is CM4360_FW_yymmddNo.bin

2) Put upgrade ﬁ le into USB root directory. (No other ﬁ le exist on root directory)

3) Change the mode to USB mode.

4) It will start update process automatically with showing “MCU UP” on Display window.

5) If the update is ﬁ nished, the set will turn off automatically.

2. EQ Program

1) File name is EQ_PRG_CM4360_yymmdd_No_Checksum.bin

2) Put upgrade ﬁ le into USB root directory. (No other ﬁ le exist on root directory)

3) Change the mode to USB mode.

4) It will start update process automatically with showing “EQ UP” on Display window.

5) If the update is ﬁ nished, the set will turn off automatically.

1-8

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label. Power consumption Refer to the main label. Networked standby : 0.4 W (If all network ports are activated.) Dimensions (W x H x D) Approx. 204.5 mm x 278 mm x 285.5 mm Net Weight Approx. 2.53 kg Operating temperature 5 °C to 35 °C Operating humidity 5 % to 90 %

• INPUTS

Analog audio in (AUX IN) 2.0 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R) x 1

• TUNER

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz

• AMPLIFIER (RMS OUTPUT POWER)

THD 20 % Total 230 W Front 115 W X 2 (4 Ω at 1 kHz)

• SYSTEM

Frequency response 100 to 20 000 Hz Signal-to-noise ratio 75 dB Dynamic range 75 dB Bus Power Supply (USB) 5 V 500 mA USB Version 2.0

FRONT SPEAKERS

•

Type 2 Way 2 Speaker Impedance 4 Ω Rated Input Power 115 W Max. Input Power 230 W Dimensions (W x H x D) Approx. 203 mm x 284.5 mm x 200 mm Net Weight Approx. 2.1 kg

• Design and specifications are subject to change without notice.

1-9

1-10

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

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

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

3. SPEAKER SECTION ................................................................................................................................ 2-8

2-1

2-2

DISPLAY

MAIN

SMPS

CABLE3

CABLE4

B/T

A52

263

CABLE5

492

254

251

252

253

255

256A

258A

257A

258B

257B

256B

492259

512

CABLE1

CABLE2

A26

511

452

A43

505

262

A46

505

A47

492265

492492

492264

261

452

505

459

260

459

505

825

266

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

NOTES) THE EXCLAMATION POINT WITHIN AN

EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

300

2. PACKING ACCESSORY SECTION

801 Owner’s manual

808 Battery

804 Bag

803 Packing

900 Remote Control

803 Packing

802 Box

3. SPEAKER SECTION

A60

SECTION 3

ELECTRICAL

CONTENTS

ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2

1. NO POWER ............................................................................................................................................ 3-2

2. NO BOOTING WHEN POWER ON THE SET........................................................................................ 3-4

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ..................................................................... 3-5

4. NO OPERATION OF MD ........................................................................................................................ 3-6

5. NO SOUND ........................................................................................................................................... 3-11

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-16

1. POWER (SMPS) ................................................................................................................................... 3-16

2. MCS PART CHECK .............................................................................................................................. 3-19

3. FLD DISPLAY CHECK ......................................................................................................................... 3-20

4. PWM MODULATION CHECK ............................................................................................................... 3-21

5. POWER AMP PART CHECK ............................................................................................................... 3-22

6. TUNER / AUX FUNCTION CHECK ...................................................................................................... 3-23

7. TUNER FUNCTION CHECK................................................................................................................. 3-24

8. CD FUNCTION CHECK ........................................................................................................................ 3-25

9. DOUBLE USB FUNCTION ................................................................................................................... 3-26

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-27

1. SDRAM ................................................................................................................................................. 3-27

2. SERVO .................................................................................................................................................. 3-27

3. AUDIO PATH ........................................................................................................................................ 3-28

4. USB ....................................................................................................................................................... 3-29

WIRING DIAGRAM .......................................................................................................................................... 3-31

BLOCK DIAGRAMS ........................................................................................................................................ 3-33

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-33

2. SMPS BLOCK DIAGRAM ..................................................................................................................... 3-35

3. POWER BLOCK DIAGRAM ................................................................................................................. 3-37

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-39

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-39

2. MAIN - POWER CIRCUIT ..................................................................................................................... 3-41

3. MAIN - SERVO CIRCUIT DIAGRAM .................................................................................................... 3-43

4. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-45

5. MAIN - DSP, AMP CIRCUIT DIAGRAM ............................................................................................... 3-47

6. MAIN - TUNER, FUNCTON, AUDIO AMP, A/D CIRCUIT DIAGRAM .................................................. 3-49

7. DISPLAY CIRCUIT DIAGRAM ............................................................................................................. 3-51

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-53

1. ICs ......................................................................................................................................................... 3-53

2. CAPACITORS ....................................................................................................................................... 3-55

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-57

1. SMPS P.C.BOARD ............................................................................................................................... 3-57

2. MAIN P.C.BOARD ................................................................................................................................ 3-59

3. DISPLAY P. C. BOARD ........................................................................................................................ 3-63

3-1

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