lg OK99 Service Manual

SERVICE MANUAL

CAUTION

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

CONFIDENTIAL

MODEL: OK99

P/NO : AFN78511848 SEPTEMBER, 2018

MODEL: OK99

HI-FI SYSTEM

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ MECHANISM (DM19D)

1-1

Only for training and service purposes.

SECTION 1

SUMMARY

CONTENTS

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

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

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

1. HIDDEN KEY MODE TABLE

2. HIDDEN KEY MODE DESCRIPTION

PROGRAM DOWNLOAD GUIDE ...................................................................................................................... 1-7

FOTA UPDATE STEP USING BT APP .......................................................................................................... 1-10

SPECIFICATIONS ........................................................................................................................................... 1-12

1-2

Only for training and service purposes.

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

Only for training and service purposes.

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

Only for training and service purposes.

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

Only for training and service purposes.

HIDDEN KEY MODE

1. HIDDEN KEY MODE TABLE

HIDDEN MODE ENTRANCE KEY(Audio) EXIT KEY

Version Check

EEPROM INITIAL

2. HIDDEN KEY MODE DESCRIPTION

2-1. Version Check

- Function : Version Check.

- Entrance Key : Front ‘Stop’ + Remote Control Key ‘Play’ for 5s.

- Exit Key : Remote Control Key ‘Play’ for 1.5s.

- Operation explanation : Remote Control Key OR .

VFD Display (Example) Result

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

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

/

Remote Control Key ‘Play’ for 1.5s

Auto exit

/

MCS Version

MICOM Version

OPTION Version

DEMO Version

DJ PRO Version

EQ Version

EQ Check sum Version

2-2. EEPROM Initial

- Function : Initialize data stored in EEPROM and BACKUP RAM data.

- Entrance Key : Front ‘Stop’ + Remote Control Key ‘ ‘ for 5s.

- Exit Key : Auto exit.

- Explanation : ‘E2P CLR’ is displayed on the VPD and turn off the power automatically.

1-6

Only for training and service purposes.

PROGRAM DOWNLOAD GUIDE

1. AUDIO PROGRAM

Download program file name must be MICOM_OK99_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

NO USB

Insert USB device at USB function.

SEARCH



MICOM UP



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-7

Only for training and service purposes.

2. CD PROGRAM

Download program file name must be HG790_OK99_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.

SEARCH



FIRMWARE



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-8

Only for training and service purposes.

3. EQ & DEMO PROGRAM

Download program file name must be EQ_DEMO_PRG_OK99_XXXX.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.

SEARCH



EQDEMOUP



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-9

Only for training and service purposes.

FOTA UPDATE STEP USING BT APP

Step1 : App connecting

(Check FW version)

After connecting the BT App with SET, the user could ﬁ nd the “Device Version info” on Setting tab.

Step2 : Device version info

When touch the “Device Version info” button, user could ﬁ nd the current and latest SET version on pop-up menu.

Step3 : Select update button

When touch the “Update” button, user could update the SET ﬁ rmware using FOTA.

Step4 : Conﬁ rm update

Select the OK button on the caution message.

1-10

Only for training and service purposes.

Step5 : Download from CDN server

Step6 : Transfer FW

1st step is download from CDN server to smart phone. The progress bar is displayed on BT App.

After completed the download from server, smart phone start to transfer the ﬁ rmware to the SET. The progress bar is displayed on BT App.

Step7 : FW Flash Writing Step8 : FOTA complete

After completed the download from the smart phone, the SET overwrite the ﬁ rmware to ﬂ ash memory.

1-11

When ﬁ nishing the ﬂ ash memory writing, pop-up message about ﬁ nish is displayed and the SET auto power off.

Only for training and service purposes.

SPECIFICATIONS

 GENERAL

Power requirements Refer to the main label on the unit. Power consumption Refer to the main label on the unit. Dimensions (W x H x D) Approx. 430 mm x 1,050 mm x 400 mm Operating temperature 5 °C to 35 °C Operating humidity 60 %

 INPUTS

Digital audio in (OPTICAL IN) 3.3 V (p-p), Optical jack x 1 Analog audio in (AUX IN) 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) Portable in (PORT. IN) 1.0 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 Available Digital Input Audio Sampling Frequency 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz

 AMPLIFIER (RMS Output power)

Total output 1,800 W RMS HIGH 450 W RMS × 2 (6 Ω at 1kHz, 15% THD) LOW 900 W RMS (12 Ω at 200Hz, 15% THD)

 Design and specifications are subject to change without notice.

1-12

Only for training and service purposes.

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

DISASSEMBLY INSTRUCTIONS ..................................................................................................................... 2-2

EXPLODED VIEWS ........................................................................................................................................... 2-9

1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-9

2. DECK MECHANISM SECTION .............................................................................................................. 2-11

3. PACKING ACCESSORY SECTION ....................................................................................................... 2-13

2-1

Only for training and service purposes.

1) Remove the 6 screws.

DISASSEMBLY INSTRUCTIONS

Figure 1. Panel Side L/R disassembly - 1

2) Disassemble each of the two screws located inside the handle.

Figure 2. Panel Side L/R disassembly - 2

2-2

Only for training and service purposes.

3) Pull out Cover Side Assembly L/R in the backward direction.

4) Remove the 3 screws.

Figure 3. Panel Side L/R disassembly - 3

Figure 4. Panel Top disassembly - 1

2-3

Only for training and service purposes.

5) Remove the two screws on the left and right sides.

Figure 5. Panel Top disassembly - 2

6) As shown in the ﬁ gure, remove the Panel Top by pushing the front part and lifting the rear part.

Figure 6. Panel Top disassembly - 3

2-4

Only for training and service purposes.

7) Remove the 9 screws on the Panel Rear.

Figure 7. Panel Rear disassembly

8) Bracket MD + Frame Main Screw 4 EA Disassembly

Figure 8. Main Set disassembly - 1

2-5

Only for training and service purposes.

9) Remove the Set LED Connector / Speaker LED Connector / Speaker Network cable.

10) Power Cable Disconnection

Figure 9. Main Set disassembly - 2

Figure 10. Main Set disassembly - 3

2-6

Only for training and service purposes.

11) Grasp both sides and pull upward to remove the assembly.

Figure 11. Main Set disassembly - 4

12) Complete removal of the Main Set.

Figure 12. After detaching the Main Set

2-7

Only for training and service purposes.

2-8

Only for training and service purposes.

P

G

256

257

255

260R

255

260L

266

I

269

268

267

270

L

K

MAIN

M

H

G

F

E

C

B

R

S

D

I

J

A46

263

275

300

A60

265

B

J

Q

251

K

L

521

272

CABLE1

CN803

SMPS

O

N

BT

A51

CABLE3

M

H

D

P

CABLE4

CABLE5

A47

RMC

C

CABLE2

273

274

F

TOP

251

A50

A00

A41

262

261

CABLE8

A52

A45

A42

277

CABLE7

E

259

258

A44

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

2-102-9

Only for training and service purposes.

2. DECK MECHANISM SECTION (DM19D)

2-122-11

1049

1015

1030

A005

A00

3. PACKING ACCESSORY SECTION

PO

W

E

R CORD

O/M

R

/

C

AN

ANT

825 FM Wire Antenna

827 Microphone

O N



826 Filter, Ferrite Core

900 Remote Control

2-13

Only for training and service purposes.

2-14

Only for training and service purposes.

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 ...................................................................................................................... 3-10

6. NO SOUND IN THE USB FUNCTION .................................................................................................. 3-15

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT ........................................................................ 3-16

8. NO POWER ON (VFD DISPLAY D-PROTECTION AND POWER OFF)............................................. 3-17

9. SPEAKER NO AUDIO .......................................................................................................................... 3-18

10. NO SOUND ........................................................................................................................................... 3-19

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-24

1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-24

2. SYSTEM PART ..................................................................................................................................... 3-27

3. NO AUDIO CHECK ............................................................................................................................... 3-28

4. NO LIGHTING ....................................................................................................................................... 3-33

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-34

1. DSP (IC501) .......................................................................................................................................... 3-34

2. PWM (IC600) ........................................................................................................................................ 3-35

3. SERVO (IC401) ..................................................................................................................................... 3-36

4. MOTOR DRIVER (IC400) ..................................................................................................................... 3-37

5. ADC ....................................................................................................................................................... 3-38

6. USB ....................................................................................................................................................... 3-38

7. BLUETOOTH ........................................................................................................................................ 3-39

WIRING DIAGRAM .......................................................................................................................................... 3-41

BLOCK DIAGRAM .......................................................................................................................................... 3-43

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-45

1. IC VOLTAGE ......................................................................................................................................... 3-45

2. FAN MOTOR VOLTAGE ...................................................................................................................... 3-46

3. SMPS CAPACITOR & ZENER DIODE ................................................................................................. 3-46

4. CAPACITOR VOLTAGE ....................................................................................................................... 3-46

5. CONNECTOR VOLTAGE ..................................................................................................................... 3-47

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-53

1. SMPS P.C.BOARD DIAGRAM ............................................................................................................. 3-53

2. MAIN P.C.BOARD DIAGRAM .............................................................................................................. 3-57

3. TOP P.C.BOARD DIAGRAM ................................................................................................................ 3-61

4. JACK & RMC P.C.BOARD DIAGRAM ................................................................................................. 3-65

5. SPARKLE LED P.C.BOARD DIAGRAM ............................................................................................... 3-65

6. X-FLASH LEFT P.C.BOARD DIAGRAM .............................................................................................. 3-67

7. X-FLASH RIGHT P.C.BOARD DIAGRAM ............................................................................................ 3-68

8. SPEAKER LED P.C.BOARD DIAGRAM .............................................................................................. 3-68

3-1

Only for training and service purposes.

lg OK99 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual