LG CM5660, CMS5760F, CMS5660 Schematic

SERVICE MANUAL

CAUTION

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

Internal Use Only

OCTOBER, 2016

MODEL: CM5660 (CM5660, CMS5760F)

MODEL: CM5660

(CM5660, CMS5760F)

MINI HI-FI SYSTEM

P/NO : AFN77612031

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 GUIDE ...................................................................................................................... 1-8

SPECIFICATIONS ........................................................................................................................................... 1-10

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

HIDDEN MODE ENTRANCE KEY EXIT KEY

Version Check

EEPROM Initial

Option EDIT

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

Power Disc Lock On/ Off

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

Child Safe On/ Off

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

Front ‘Stop’ + Remote Control Key ‘

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

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

Front ‘Stop’ + Front ‘Open’ for 5 s

Front/ Remote Control Key ‘Power’ for 5 s

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

/ /

’ for 5 s

Auto Exit

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

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

Front ‘Stop’ + Front ‘Open’ for 5 s

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

1-6

SERVICE INFORMATION FOR EEPROM

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”

DETECT NEW EEPROM (OPTION EDIT SCREEN)

NAME

OPT0 OPT1 OPT2 OPT3 OPT4 OPT5 OPT6 OPT7 OPT8 OPT9 OPT10 OPT11 OPT12 OPT13 OPT14

HEX

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Front ‘Stop’ + Remote control ‘ ’

push same timing during 5 s

VFD “E2P CLR”

Completed

1-7

PROGRAM DOWNLOAD GUIDE

1. DSP PROGRAM

Download program file name must be HG640_CM5760(CM5660)_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

NO USB

Insert USB device at USB function.



FIRMWARE



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-8

2. EQ PROGRAM

Download program file name must be EQ_PRG.BIN

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

NO USB

Insert USB device at USB function.



EQ UP



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-9

SPECIFICATIONS

• 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. 207 mm x 282 mm x 261 mm Net Weight Approx. 3.5 kg Operating temperature 5 °C to 35 °C Operating humidity 5 % to 90 %

• INPUTS

Analog audio in (AUX IN) 2.5 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R) Portable in (PORT. IN) 1.4 Vrms (3.5 mm stereo jack) x 1 Microphone (MIC) Sensitivity 20 mV (1 kHz), 6.3 mm jack x 1

• TUNER

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz AM Tuning Range 522 to 1,620 kHz, 520 to 1,710 kHz or 522 to 1,710 kHz

• SYSTEM

Frequency Response 70 to 20,000 Hz Signal-to-noise ratio More than 75 dB Dynamic range More than 75 dB Bus Power Supply (USB) 5 V 500 mA

• AMPLIFIER (RMS OUTPUT POWER)

Total 700 W Front 350 W x 2 (4 Ω at 1 kHz, 20 % THD)

• FRONT SPEAKER

Type 2 Way 2 Speaker Impedance 4 Ω Rated Input Power 350 W Max. Input power 700 W Net Dimensions (W x H x D) Approx. 299 mm x 363 mm x 230 mm Net Weight Approx. 5 kg

• Design and specifications are subject to change without notice.

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

FRONT

MAIN

SMPS

300300

B/T

A52

A42

443

259

443

A47

443

264

443

263

A46

265

A44

266

269

262

443

260

443

251

443

255

443

254

A43

A56

498

CABLE1

CABLE4

443

A00

300300

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.

2. PACKING ACCESSORY SECTION

801 Owner’s manual

825 FM Wire Antenna

804 Bag

808 Battery

900 Remote Control

803 Packing

802 Box

2-7

3. SPEAKER SECTION

A60

2-8

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 BOOTING (IN CD/USB FUNCTION) ................................................................................................ 3-6

5. NO OPERATION OF MD ........................................................................................................................ 3-9

6. NO SOUND ........................................................................................................................................... 3-14

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-22

1. POWER (SMPS) ................................................................................................................................... 3-22

2. MCS PART CHECK .............................................................................................................................. 3-25

3. FLD DISPLAY CHECK ......................................................................................................................... 3-26

4. PWM MODULATION CHECK ............................................................................................................... 3-27

5. POWER AMP PART CHECK ............................................................................................................... 3-28

6. TUNER / AUX FUNCTION CHECK ...................................................................................................... 3-29

7. TUNER FUNCTION CHECK................................................................................................................. 3-30

8. CD FUNCTION CHECK ........................................................................................................................ 3-31

9. DOUBLE USB FUNCTION ................................................................................................................... 3-32

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-33

1. DSP (IC500) .......................................................................................................................................... 3-33

2. SDRAM (IC504) .................................................................................................................................... 3-34

3. SERVO (IC401) ..................................................................................................................................... 3-35

4. MOTOR DRIVER (IC400) ..................................................................................................................... 3-36

5. ADC (IC202) .......................................................................................................................................... 3-37

6. USB (JK500) ......................................................................................................................................... 3-37

7. BLUETOOTH (CN501) .......................................................................................................................... 3-38

WIRING DIAGRAM .......................................................................................................................................... 3-39

BLOCK DIAGRAMS ........................................................................................................................................ 3-41

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-41

2. POWER BLOCK DIAGRAM ................................................................................................................. 3-43

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-45

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-46

2. MAIN - DSP SoC CIRCUIT DIAGRAM ................................................................................................. 3-47

3. MAIN - POWER PART CIRCUIT DIAGRAM ........................................................................................ 3-49

4. MAIN - ADC/DAC CIRCUIT DIAGRAM ................................................................................................ 3-51

5. MAIN - RF SERVO CIRCUIT DIAGRAM .............................................................................................. 3-53

6. MAIN - PWM/AMP IC CIRCUIT DIAGRAM .......................................................................................... 3-55

7. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-57

8. JACK CIRCUIT DIAGRAM ................................................................................................................... 3-59

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-61

1. ICs VOLTAGE ....................................................................................................................................... 3-61

2. CAPACITORS VOLTAGE ..................................................................................................................... 3-62

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-63

1. SMPS P.C.BOARD ............................................................................................................................... 3-63

2. MAIN P.C.BOARD ................................................................................................................................ 3-65

3. FRONT P.C.BOARD ............................................................................................................................. 3-67

4. JACK P.C.BOARD ................................................................................................................................ 3-69

3-1

ONE POINT REPAIR GUIDE

1. NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. FUSE/ THERMISTOR/ BRIDGE DIODE

1-1-1. Solution

Please check and replace F901, TH901 or TH903, BD901 on SMPS board.

1-1-2. How to troubleshoot (Countermeasure)

1) Check if the fuse F901 is open or short-circuit.

2) Check if the NTC thermistor TH900 or TH903 is normal or open.

3) Check if the bridge diode BD901 is short-circuit by over current with a digital multi-meter.

1-1-3. Service hint (Any picture/ Remark)

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

If TH901 or TH903 is open,

replace it with a new one.

3-2

< BD901 >

If BD901 is short-circuit,

replace it with a new one.

+ 44 hidden pages