LG CJ87, CJS87F Service manual

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SERVICE MANUAL

CAUTION

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

Internal Use Only

FEBRUARY, 2017

MODEL: CJ87 (CJ87, CJS87F)

MODEL: CJ87

(CJ87, CJS87F)

MINI HI-FI SYSTEM

P/NO : AFN77612162

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ MECHANISM (DM14B)

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

1-1

SECTION 1

SUMMARY

CONTENTS

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

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

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

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

2. HIDDEN KEY MODE DESCRIPTION ....................................................................................................... 1-7

SERVICE INFORMATION FOR EEPROM ........................................................................................................ 1-9

PROGRAM DOWNLOAD GUIDE .................................................................................................................... 1-10

FOTA UPDATE STEP USING BT APP .......................................................................................................... 1-13

SPECIFICATIONS ........................................................................................................................................... 1-15

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

1. HIDDEN KEY MODE TABLE

HIDDEN MODE ENTRANCE KEY(Audio) EXIT KEY

Version Check

EEPROM INITIAL

Option EDIT

APD Test Display

Disc Lock On/Off

Power Disc Lock On/Off

Demo ALL Key Lock

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

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

Measure

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

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

Front ‘Stop’  + Remote Control Key ‘3’ for 5s

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

Front ‘Stop’  + Front ‘Open’ for 5s Front ‘Stop’  + Front ‘Open’ for 5s

Front ‘Stop’  + Remote Control Key ‘9’ for 5s

Front ‘Stop’  + Remote Control Key ‘1’ for 5s

Remote Control Key ‘Play’ for 1.5s

Auto exit

Front ‘Stop’  + Remote Control Key ‘ ‘

Auto exit

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

Front ‘Stop’  + Remote Control Key ‘9’ for 5s

Front/Remote Control Key ‘Power’ SET Power Off

Remote Control Key ‘SOUND EFFECT’

1-6

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

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.

2-3. OPTION EDIT (EEPROM)

- Refer to the page 00.

2-4. APD Test Display

- Function : Auto Power Down timer is displayed on VFD.

- Entrance Key : Front ‘Stop’ + Remote Control Key ‘3’ for 5s.

- Exit Key : Auto Exit.

- Explanation : display APD Timer HH=(hour) MM=(min), SS=(sec).

1-7

2-5. Disc Lock On/Off

- Function : Lock Open Key.

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

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

- Operation Explain : Open Key Block ‘LOCKED’.

2-6. Power Disc Lock On/Off

- Function : Lock Power / Open / Front Volume Key.

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

- Exit Key : Front ‘Stop’ + Front ‘Open’ for 5s.

2-7. Demo All Key Lock

- Function : All key is blocked on Demo Mode.

- Entrance Key : Front ‘Stop’ + Remote Control Key ‘9’ for 5s.

- Exit Key : Front ‘Stop’ + Remote Control Key ‘9’ for 5s.

- Operation Key : In demo mode, all key blocks. (only the volume key is effective when All Key Lock is enabled.) To release Demo Mode, it is available after All Key Lock Off.

2-8. BT Auto Power On/Off

- Function : Ability to disable BT Auto Power On function by network shutdown regulation.

- Entrance Key : Front/Remote Control Key ‘Power’ for 5s.

- Exit Key : SET Power Off with Front / Remote Control Key ‘Power’.

2-9. ChildSafe On/Off

- Function : Power off Fade-in to previous volume.

- Entrance Key : Volume 0(Min) + Front ‘OK’ for 3s.

- Exit Key : Volume 0(Min) + Front ‘OK’ for 3s.

2-10. Measure

- Function : Change to EQ for Measure mode, Down algorithm operation Disable, Change to output setting value for measure mode.

- Entrance Key : Front ‘Stop’ + Remote Control Key ‘1’ for 5s

- Exit Key : Remote Control Key ‘SOUND EFFECT’

1-8

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

01 31

26 19 00 00 43

38 37 00 00 00 00

Front ‘Stop’ + Remote control ‘ ’

push same timing during 5 s

VFD “E2P CLR”

Completed

1-9

PROGRAM DOWNLOAD GUIDE

1. AUDIO PROGRAM

Download program file name must be MICOM_CJ87_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.



MICOM UP



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-10

2. CD PROGRAM

Download program file name must be HG790_CJ87_YYMMDDX.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.



FIRMWARE



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-11

3. EQ & DEMO PROGRAM

Download program file name must be EQ_DEMO_PRG_CJ87_XXXX.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.



EQDEMOUP



FINISH



AUTO POWER OFF

1) (Fast) Format USB device.

2) Copy Firmware file to USB device.

1-12

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.

1-13

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.

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

1-14

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. 450 mm x 170 mm x 349 mm 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) 1.0 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 AM Tuning Range 522 to 1,620 kHz, 520 to 1,710 kHz or 522 to 1,710 kHz

 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 2,350 W RMS HIGH 585 W RMS x 2 (6 Ω at 5 kHz, 30 % THD) LOW 590 W RMS x 2 (6 Ω at 1 kHz, 30 % THD)

 FRONT SPEAKER

Type HIGH : 1 Way 1 Speaker LOW : 1 Way 1 Speaker Impedance HIGH : 6 Ω LOW : 6 Ω Rated Input power HIGH : 585 W RMS LOW : 590 W RMS Max. Input power HIGH : 1,170 W RMS LOW : 1,180 W RMS Dimensions (W x H x D) Approx. 320 mm x 454 mm x 309 mm

 Design and specifications are subject to change without notice.

1-15

1-16

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

DISASSEMBLY INSTRUCTIONS ................................................................................................................... 2-9

1. Case Top ................................................................................................................................................... 2-9

2. Panel Front Assembly ............................................................................................................................... 2-9

3. Panel PCB & Multi Knob ......................................................................................................................... 2-10

4. Bracket Hook ........................................................................................................................................... 2-11

5. Main PCB & SMPS PCB ......................................................................................................................... 2-12

6. Bracket Inner ........................................................................................................................................... 2-13

7. MD & Lighting PCB ................................................................................................................................. 2-14

8. Panel Rear .............................................................................................................................................. 2-14

2-1

2-2

SMPS

MIC

A47

262

A45

498

271

498

271

CABLE1

443

265

252

A42

270

443

MAIN

272

300

498

A52

443

275

443

273

CABLE2

A46

254

443

FRONT

A43

266

443

263

443

274

443

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

2-42-3

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.

2-62-5

2. PACKING ACCESSORY SECTION

801 Owner’s manual

825 FM antenna

808 Battries

900 Remote control

Packing803

804 Bag

802 Box

2-7

3. SPEAKER SECTION

• FRONT SPEAKER

A60

2-8

DISASSEMBLY INSTRUCTIONS

1. Case Top

1-1) Remove the 7 Screws. 1-2) Remove the Case Top.

Figure 1

2. Panel Front Assembly

2-1) Disconnect the 4 FFC Cables from the Main Board. 2-2) Unhook the 10 Locking Tabs by using Flat-head screwdriver. 2-3) Remove the Panel Front Assembly.

Figure 2

2-9

(H1)

3. Panel PCB & Multi Knob

3-1) Multi Knob

3-1-1) Insert a Flat-head screwdriver in the hole (H1). 3-1-2) Remove the Multi Knob.

3-2) Jack PCB

3-2-1) Remove the 2 Screws. 3-2-2) Remove the Jack PCB.

3-3) BT Module

3-3-1) Unhook the Locking tab (L1). 3-3-2) Remove the BT Module.

3-4) Front PCB

3-4-1) Remove the 11 Screws. 3-4-2) Remove the Front PCB.

(L1)

(H1)

(L2)

(H1)

Figure 3

2-10

4. Bracket Hook

4-1) Remove the 2 Screws. 4-2) Rotate 90 degrees to the front. 4-3) Remove the Bracket Hook.

Figure 4

2-11

5. Main PCB & SMPS PCB

5-1) Remove the 2 Screws from the Panel Rear. 5-2) Disconnect the 4 FFC Cables from the Main Board. 5-3) Remove the 10 Screws from the Main Board & SMPS Board. 5-4) Remove the Main Board & SMPS Board.

Figure 5

2-12

6. Bracket Inner

6-1) Remove the 2 Screws from the Panel Rear. 6-2) Remove the 2 Screws from the Bracket Inner. 6-3) Remove the Bracket Inner.

Figure 6

2-13

7. MD & Lighting PCB

7-1) Remove the 2 Screws from the MD. 7-2) Remove the 2 Screws from the Lighting PCB. 7-3) Remove the MD & Lighting PCB.

8. Panel Rear

8-1) Remove the 1 Screw from the Panel Rear. 8-2) Remove the Panel Rear.

Figure 7

Figure 8

2-14

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. NO BOOTING IN CD/USB FUNCTION .................................................................................................. 3-5

4. NO OPERATION OF MD ...................................................................................................................... 3-10

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

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

7. NO POWER ON (STANDBY LED IS BLINKING) ................................................................................. 3-17

8. SPEAKER NO AUDIO .......................................................................................................................... 3-18

9. NO SOUND ........................................................................................................................................... 3-19

10. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ................................................................... 3-24

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-25

1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-25

2. SYSTEM PART ..................................................................................................................................... 3-28

3. NO AUDIO CHECK ............................................................................................................................... 3-29

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. CAPACITOR VOLTAGE ....................................................................................................................... 3-45

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-47

1. SMPS P.C.BOARD DIAGRAM ............................................................................................................. 3-47

2. MAIN P.C.BOARD DIAGRAM .............................................................................................................. 3-51

3. FRONT P.C.BOARD DIAGRAM ........................................................................................................... 3-55

4. JACK P.C.BOARD DIAGRAM .............................................................................................................. 3-59

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. POWER

1-1-1. Solution

Please check and replace F901, BD901 and TH900 ~ TH903 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 bridge diode BD901 is short-circuit by over current with a digital multi meter.

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

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

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

< BD901 >

If BD901 is short-circuit,

replace it with a new one.

3-2

If TH900 ~ TH903 is open,

replace it with a new one.

ONE POINT REPAIR GUIDE

NO POWER

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

1-2. AMP POWER

1-2-1. Solution

Please check and replace F911, Q905, Q906 on SMPS board.

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

1) Check if the fuse F911 is open or short-circuit.

2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q905, Q906 with a digital multimeter.  If it is short condition, it’s destroyed. Replace it with a new one. (Please replace 2 FET at the same time although several FET is OK).

1-2-3. Service hint (Any picture/ Remark)

< F911 >

If F911 is not short-circuit,

replace it with a same speciﬁ cations one.

< Q905, Q906 >

If Q905, Q906 is short-circuit,

replace it with a new one.

3-3

ONE POINT REPAIR GUIDE

X500

(24 MHz)

X501

(32.768 kHz)

KEY1

(R53D)

PWR_CTRL

(R508)

IC501

2. NO BOOTING WHEN POWER ON THE SET

The set doesn’t work when press the power button on the FRONT board or the remote control.

2-1. IC501

2-1-1. Solution

Replace IC501 on MAIN board.

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

1) Check the 5.6 VA(CN300) and DVCC 3.3 V(IC306) in standby mode.  If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC306.

2) Check 5.6 VA, +12 V, F+, F-, an VH when power on the set. 

If the set doesn’t work regardless of what the KEY1 changes high to low while pressing the power button. X500 and X501 work normally but, if you can not power on the set, replace the IC501 with a new one on the main board.

2-1-3. Service hint (Any picture/ Remark)

KEY1

(R53D)

PWR_CTRL

(R508)

< MAIN board top view >

3-4

IC501

X501

(32.768 kHz)

X500

(24 MHz)

ONE POINT REPAIR GUIDE

IC302

IC306

3. NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

3-1. NO VCC33, VCC12

3-1-1. Solution

Please check and replace IC302, IC306 on MAIN board.

3-1-2. How to troubleshoot (Countermeasure)

1) Check voltage of IC306 pin5 & IC301 pin4 on MAIN board.

 If IC306 pin5(about 3.4 V) doesn’t come out, check 3.4 VA from IC301.  If IC301 pin4(about 4.9 V) doesn’t come out, check +5.1 VA from SMPS.

2) If IC306 pin3(about 3.4 V) is normal, check the PWR_CTRL(IC306 pin4) is high(about 3.3 V)  If PWR_CTRL isn’t high, check pin D11 of IC501 & R550.

3) If PWR_CTRL is high, check R550 and if there’s no defective component then replace IC306.

4) If 3.3 V(VCC33) is normal, check 1.2 V output(pin3) voltage of IC302.  If 1.2 V of IC302 pin3 doesn’t come out, then replace IC302.

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

IC306

< MAIN board top view >

IC302

3-5

ONE POINT REPAIR GUIDE

IC501

X500

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

3-2. CRYSTAL (X500)

3-2-1. Solution

Replace X500 on MAIN board.

3-2-2. How to troubleshoot (Countermeasure)

1) If 3.3 V & 1.2 V is normal, check reset ‘HIGH’ of IC501 pin T12 on MAIN board.  If MAIN_RESET isn’t HIGH, check MICOM(IC100) pin40.

2) If MAIN_RESET is HIGH, check the soldering status of 24 MHz crystal(X500).

3) If the crystal(X500) doesn’t oscillate, check R551, R55E, C536, C53B around crystal(X500)  If there’s no defective component, then replace X500.

3-2-3. Service hint (Any picture/ Remark)

XXXII

IC501

X500

XXO

< MAIN board top view >

< Signal waveform >

X500

3-6

ONE POINT REPAIR GUIDE

VCC

CLK

CS#

IC503

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

3-3. SERIAL FLASH (IC503)

3-3-1. Solution

Please check and replace IC503 on MAIN board.

3-3-2. How to troubleshoot (Countermeasure)

1) If the crystal(X500) does oscillate, check Serial Flash(IC503) on MAIN board.  Check pin8(VCC), pin6(CLK), pin1(CS), pin2(DO), pin5(DI) of below waveform.

2) If pin1, 2, 5, 6, 8 doesn’t come out, check damping resistor(R54A, R54B, R54C, R54D) of IC503.  If damping resistor of IC503 is OK, then replace IC503. (it need to download program)

3) After change IC503, if It is still not below waveform, check IC501(DSP IC).

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

IC503

< MAIN board bottom view >

< Signal waveform >

3-7

ONE POINT REPAIR GUIDE

V CC

Res et

Add ress

Data

/ CS

R AS

/ WE

CAS

IC504

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

3-4. SDRAM (IC504)

3-4-1. Solution

Please check and replace IC504 on MAIN board.

3-4-2. How to troubleshoot (Countermeasure)

1) Check below waveform & soldering status of SDRAM(IC504) on MAIN board. 

If pin17(#CAS), pin18(#RAS), pin19(#CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out, check damping resistor(R565, R567, R569, R563).

2) If resistor is OK, then replace IC502(SDRAM).

3) After change IC504, if It is still not below waveform, check IC501(DSP IC).

3-4-3. Service hint (Any picture/ Remark)

IC504

< Signal waveform >< MAIN board bottom view >

3-8

ONE POINT REPAIR GUIDE

IC501

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

3-5. DSP (IC501)

3-5-1. Solution

Please check and replace IC501 on MAIN board.

3-5-2. How to troubleshoot (Countermeasure)

1) After check them by previous pages about no booting, if the set is still no booting,  Check soldering status of IC501.

2) If below bootstrap waveform doesn’t come out, then replace IC501(DSP IC).

3-5-3. Service hint (Any picture/ Remark)

R578 PGPB07 (YELLOW)

R598 PAD19

IC501

(GREEN)

< MAIN board top view >

R597 PAD20 (PINK)

< Bootstrap waveform >

3-9

ONE POINT REPAIR GUIDE

SP-

pin8 of CN401

SP+

pin6 of CN401

IC400

4. NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the spindle motor among them.

4-1. SPINDLE MOTOR

4-1-1. Solution

Replace IC401 or IC400 on MAIN board.

4-1-2. How to troubleshoot (Countermeasure)

1) Check the SPDO signal from pin16 of IC401.  If no signal, check 3.3 V(RF) and X400.

2) Check the SP- & SP+ from IC400 to CN401 for driving SPINDLE motor. It is about 3.6 Vp-p.  If no signal, check +1.8 V and DVCC +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the spindle motor is short-circuit or has any trouble, it can not rotate CD discs. Please check the function after changing another MD.

4-1-3. Service hint (Any picture/ Remark)

SP-

pin8 of CN401

pin6 of CN401

SP+

zwR

zwT

< Waveform of SP- & SP+

for driving SPINDLE motor >

IC400

< MAIN board top view >

3-10

SL-

pin9 of CN401

SL+

pin7 of CN401

IC400

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the sled motor among them.

4-2. SLED MOTOR

4-2-1. Solution

Replace IC401 or IC400 on MAIN board.

4-2-2. How to troubleshoot (Countermeasure)

1) Check the SLDO signal from pin23 of IC401.  If no signal, check 3.3 V (RF) and X400.

2) Check the SLED+ & SLED- from IC400 to CN401 for driving SPINDLE motor. It is about 2.9 Vp-p.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the sled motor is sort-circuit or has any trouble, it can not move the pickup module. Please check the function after changing another MD.

4-2-3. Service hint (Any picture/ Remark)

SL+

zsR

SL-

pin9 of CN401

pin7 of CN401

zsT

< Waveform of SL- & SL+

for driving SLED motor >

IC400

< MAIN board top view >

3-11

ONE POINT REPAIR GUIDE

LO+

pin4 of CN401

LO-

pin2 of CN401

MOT_CLOSE pin6 of IC400

MOT_OPEN

pin7 of IC400

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the tray open/close motor among them.

4-3. TRAY OPEN/ CLOSE MOTOR

4-3-1. Solution

Replace IC401 or IC400 on MAIN board.

4-3-2. How to troubleshoot (Countermeasure)

1) Check MOT_OPEN & MOT_CLOSE signals from pin K4 & L4 of IC501 to IC400.  If no signal, check +1.8 V & + 5 V to IC400.

2) Check LOAD ± from IC400 to CN401 for driving the tray open/ close motor. It is about 3.85 Vp-p.  If no signal, check +5 V to IC401. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the tray motor is short-circuit or has any trouble, it can not open or close the tray. Please check the function after changing another MD.

4-3-3. Service hint (Any picture/ Remark)

svT

svROylkP

LO+

pin4 of CN401

pin2 of CN401

LO-

MOT_OPEN

pin7 of IC400

tv{  v w lu

tv{  jsvz l

< Waveform

for driving tray open/ close motor >

MOT_CLOSE pin6 of IC400

< MAIN board top view >

3-12

ONE POINT REPAIR GUIDE

TR-

pin17 of CN400

TR+

pin16 of CN400

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the laser tracking actuator.

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Replace IC401 or IC400 on MAIN board.

4-4-2. How to troubleshoot (Countermeasure)

The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.

1) Check the TRD signal from pin14 of IC401.  If no signal, check 3.3 V(RF) and X400.

2) Check TR- & TR+ from IC400 to CN400 for driving the tracking actuator.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN400 and MD.

4) Check the MD.  If the pickup module has any trouble, it can not move the laser beam on the left or right side. Please check the function after changing another MD.

4-4-3. Service hint (Any picture/ Remark)

{yTGju[WW {y RGGju[WW

< Waveform of TR±

for driving tracking actuator >

TR-

pin17 of CN400

TR+

pin16 of CN400

< MAIN board top view >

3-13

ONE POINT REPAIR GUIDE

F-

pin18 of CN400

F+

pin15 of CN400

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the laser focusing actuator.

4-5. LASER FOCUSING ACTUATOR

4-5-1. Solution

Replace IC401 or IC400 on MAIN board.

4-5-2. How to troubleshoot (Countermeasure)

The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.

1) Check the FDO signal from pin21 of IC401.  If no signal, check 3.3 V(RF) and X400.

2) Check F- & F+ from IC400 to CN400 for driving the focusing actuator.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN400 and MD.

4) Check the MD.  If the pick-up module has any trouble, it can not move the laser beam on the top or bottom side. Please check the function after changing another MD.

4-5-3. Service hint (Any picture/ Remark)

mRGGju[WW

mT  Gju[WW

< Waveform of F±

for driving focusing actuator >

pin18 of CN400

pin15 of CN400

< MAIN board top view >

F-

F+

3-14

ONE POINT REPAIR GUIDE

D+

D-

CN503

5. NO SOUND IN THE USB FUNCTION

There is no sound output in the USB function, repair the set according to the following

5-1. USB FUNCTION

5-1-1. Solution

Replace IC501 or IC303 on MAIN board.

5-1-2. How to troubleshoot (Countermeasure)

1) Check USB_5V to MAIN board.

 if +5.1 VA to pin5 of IC303(LDO) doesn’t come out, check pin4 & pin5 of CN503.  if +5.1 VA is normal & USB_5V of IC303 pin1 doesn’t come out, then replace IC303.

2) Check “Digital audio AMP block”.

5-1-3. Service hint (Any picture/ Remark)

D-

CN503

guide.

USB D-/ D+ (CN503 pin4, pin5)

< Waveform of USB D± signal >

< MAIN board top view >

3-15

ONE POINT REPAIR GUIDE

IC700

IC802

IC801

IC800

IC702

IC701

6. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

Audio signal output is small or not. when you power on the middle power mini system.

6-1. AMP IC (IC700 ~ IC702, IC800 ~ IC802)

6-1-1. Solution

Replace IC700 ~ IC702, IC800 ~ IC802 on MAIN board.

6-1-2. How to troubleshoot (Countermeasure)

1) Please check if this system is on bass blast mode.  C, RL and RR make sound only on bass blast mode.

2) Check the IC700 ~ IC702, IC800 ~ IC802 on your eyes.

3) Check the audio signal output check(pin13 of IC700 ~ IC702, IC800 ~ IC802). First, check the PWM data input (pin3 of IC700 ~ IC702, IC800 ~ IC802)

4) If the audio signal output has no output, try to change IC which has no output.

5) Lastly, check speaker terminal (JK700).

6-1-3. Service hint (Any picture/ Remark)

IC700

IC701

IC702

IC800

IC801

IC802

< MAIN board top view >

3-16

ONE POINT REPAIR GUIDE

AMP FETs

7. NO POWER ON (STANDBY LED IS BLINKING)

It doesn’t turn on, and blinks standby LED (RED).

7-1. AMP FETs

7-1-1. Solution

Replace AMP FET on MAIN board.

7-1-2. How to troubleshoot (Countermeasure)

1) This symptom occurs, when DC protection is detected. MAIN reasons are like below.

- When some of AMP FETs dead.

7-1-3. Service hint (Any picture/ Remark)

AMP FET : IRF6775

< MAIN board top view >

Notice for FET service

- In case of RF6775, Metal case, FET Drain, has electric potential. So be careful when you deal with it.

AMP FETs

* You can see FET after removing heatsink. * Notice for Service

Before repair MAIN Assy, you need to discharge SMPS. After then, open the connector. You should try to change both of +/- FET and Driver IC as a pair.

3-17

ONE POINT REPAIR GUIDE

CN800

pin1, 2 : +66 V

pin3, 4 : PGND

pin5, 6 : -66 V

pin5 of IC

CSD

8. SPEAKER NO AUDIO

Speaker no audio.

8-1. AMP IC (IC700 ~ IC702, IC800 ~ IC802)

8-1-1. Solution

Replace IC700 ~ IC702, IC800 ~ IC802 on MAIN board.

8-1-2. How to troubleshoot (Countermeasure)

1) Check supply voltage of AMP(CN800) & PWM signal Normal supply voltage and signal  Check AMP IC. Poor supply voltage  Check SMPS assy. Poor signal  Check PWM IC.

2) Check CSD of FET driver IC (IRS2092 : EAN60778301). CSD has about 5 V on normal state. When AMP has problem, CSD is LOW state or keep change LOW to HIGH.

8-1-3. Service hint (Any picture/ Remark)

pin5 of IC 

CSD

< MAIN board top view >

CN800

pin1, 2 : +66 V

pin3, 4 : PGND

pin5, 6 : -66 V

< AMP IC > < AMP IC >

3-18

ONE POINT REPAIR GUIDE

AR201

IC200

R219

R209

R208

MCS_MCLK to R219

AUX_L to R208

AUX_R to R209

MCS_LRCK to AR201

MCS_BCK to AR201

ADC_DATA to AR201

9. NO SOUND

There is no sound output in the AUX function, repair the set according to the following guide.

9-1. AUX FUNCTION

9-1-1. Solution

Replace IC200 on MAIN board.

9-1-2. How to troubleshoot (Countermeasure)

1) Check AUX_L/R signals to IC200(pin3, pin4).

2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC200.

3) Check if ADC_DATA is entered from IC200 to IC501.  If no signal, check ADC_3.3 V & DVCC_3.3 V2 for IC200. If is NG, replace it a new one.

4) Check the following I2S signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC.

The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

9-1-3. Service hint (Any picture/ Remark)

MCS_LRCK to AR201

MCS_BCK to AR201

ADC_DATA to AR201

< MAIN board top view >

3-19

AR201

IC200

MCS_MCLK to R219

AUX_R to R209

AUX_L to R208

R219

R209

R208

IC200

PTB_L to pin21

PTB_R to pin22

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the PORT. IN function, repair the set according to the following guide.

9-2. PORT. IN FUNCTION

9-2-1. Solution

Replace IC200 on MAIN board.

9-2-2. How to troubleshoot (Countermeasure)

1) Check PT_L/ R signal from FRONT board to MAIN board.

2) Check if PT_L/ R is entered pin1 & pin3 of CN201.

3) Check PT_L/R signals to IC201(pin9, pin10).

4) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC201.

5) Check if ADC_DATA is entered from IC201 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it a new one.

6) Check the following I2S signal flow from IC501 to IC202.  If there is any trouble, check the power for each IC.

The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

7) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

9-2-3. Service hint (Any picture/ Remark)

IC600

PWM

POT. IN

IR AMP

MCS_MCLK

IC200

IC501

T-

ADC_DATA

POT_L/R

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

Front

Board

< PORT. IN function signal ﬂ ow diagram >

IC200

PTB_L to pin21

PTB_R to pin22

< MAIN board top view >

3-20

ONE POINT REPAIR GUIDE

IC200

TUNER_L to pin26

TUNER_R to pin27

NO SOUND

There is no sound output in the TUNER function, repair the set according to the following guide.

9-3. TUNER FUNCTION

9-3-1. Solution

Replace IC200, TU500 on MAIN board.

9-3-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_LR is entered from pin1 & pin3 of TU200 to IC200(pin1, pin2).

 If no signals, check +3.3 V for tuner power.  Check if the tuner control signals(CLK, DAT, CE, RST, GPO2) are entered from IC501 to TU200.

If it doesn’t work, replace TUNER with a new one.

2) Check if MCS_BCK, MCS_LRCK & MCS_MCLK are entered from IC501 to IC200.

3) Check if ADC_DATA is entered from IC200 to IC501.  If no signal, check +3.3 V(ADC) for IC200. If is NG, replace it a new one.

4) Check the following I2S audio signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC.

The power is normal but , if the signal waveform to the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

9-3-3. Service hint (Any picture/ Remark)

T-

IC200

MCS_MCLK

IC501

IC600

PWM

< TUNER function signal ﬂ ow diagram >

TUNER_L/R

ADC_DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

TUNER

IR AMP

IC200

TUNER_L to pin26

TUNER_R to pin27

< MAIN board top view >

3-21

ONE POINT REPAIR GUIDE

IC201

MIC_OUTPUT. pin3

MIC_IN_DATA. pin2

MCS_MCLK to R219

MCS_LRCK to AR201

MCS_BCK to AR201

ADC_DATA to AR201

IC200

NO SOUND

There is no sound output in the MIC IN function, repair the set according to the following guide.

9-4. MIC IN FUNCTION

9-4-1. Solution

Replace IC200, IC201 on MAIN board.

9-4-2. How to troubleshoot (Countermeasure)

1) Check MIC_SIG signal to pin6 of CN200.  If no signal, check the signal to pin7 of CN3M01 on the FRONT board. Check if the signal is entered from pin6 of CN200 to MAIN board.

2) Check if MIC_SIG is entered from pin6 of CN200 to pin2, pin13 to IC201(MIC AMP).

3) Check if the amplified signal comes out from pin3 & pin12 of IC201.  If no signal output, check +3.3 V for IC201, replace IC201 with a new one if it has a problem.

4) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC200.

5) Check if ADC_DATA is entered from IC200 to IC501.  If no signal, check +3.3 V(ADC) for IC200. If is NG, replace it a new one.

6) Check the following I2S signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC.

The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

7) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

9-4-3. Service hint (Any picture/ Remark)

MCS_MCLK to R219

MCS_LRCK to AR201

MCS_BCK to AR201

ADC_DATA to AR201

IC200

< MAIN board top view >

IC201

MIC_IN_DATA. pin2

MIC_OUTPUT. pin3

< MAIN board bottom view >

3-22

ONE POINT REPAIR GUIDE

BT_TX. pin4

BT_RX. pin6 BT_RTS. pin7 BT_CTS. pin8

CN500

BT_TX. R519

BT_RTS. R51D

BT_RX. R51B

BT_CTS. R512

NO SOUND

There is no sound output in the Bluetooth function, repair the set according to the following guide.

9-5. BLUETOOTH FUNCTION

9-5-1. Solution

Replace IC501 on the MAIN board or bluetooth module on the FRONT Panel.

9-5-2. How to troubleshoot (Countermeasure)

1) Check BT_RX, BT_TX signal to pin4, pin6 of CN504.  If no signal, check the signal to pin4, pin6 and pin10 (+3.3 V) of on the Bluetooth module and cable connection state.  If there are no signal out from module, replace new module.

2) Check if BT_RX/ TX is entered from pin4, pin6 of CN504 to pin K1, pin L1 to IC501(DSP).

3) Check if MCS_BCK, MCS_LRCK & MIX_DATAN is entered from IC501 to IC202.  If no signal, check VCC12(+1.2 V) for IC501. If it is abnormal, change replace it a new one.

4) Check the following I2S signal flow from IC501 to IC202.  If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.

5) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

9-5-3. Service hint (Any picture/ Remark)

B/T Module

BT_RX, BT_TX

IC501

IC600

PWM

MCS_BCK MCS_LRCK MIX_DATA_OUT

IR AMP

BT_TX. pin4

BT_RX. pin6 BT_RTS. pin7 BT_CTS. pin8

BT_TX. R519

CN500

BT_RTS. R51D

BT_RX. R51B

BT_CTS. R512

3-23

< MAIN board top view >< MAIN board bottom view >

ONE POINT REPAIR GUIDE

VFD_STB,

VFD_CLK,

VFD_DO

10. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

When power on the set, any icons or characters on VFD are not displayed.

10-1. VFD (VFD301)

10-1-1. Solution

Please check and replace VFD301 on FRONT board.

10-1-2. How to troubleshoot (Countermeasure)

1) Check if VH, F+ and F-, DVCC_3.3V are output from SMPS to VFD via the MAIN board.

2) Check if the IC501 outputs VFD_CLK, VFD_STB, and VFD_DO to the FRONT board.

3) Check if the VH, FRONT_12V, SW on the FRONT board.  If the VH from VFD(DGND, VDD) isn’t output, replace VFD with a new one.

10-1-3. Service hint (Any picture/ Remark)

VFD_STB,

VFD_CLK,

VFD_DO

< FRONT circuit > < FRONT circuit >

3-24

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No output 5.1 VA

Is the F901 normal?

YES

Is BD901 normal?

YES

Is the VCC

(11 V ~ 25 V) supplied to IC901

pin4?

YES

Power line of MAIN PCB is short.

Replace F901 (same fuse).

Replace BD901.

Is D960, D961 normal?

Check or replace D960, D961.

No 12 V

VCC 12 VA supplied to IC951

‘HIGH’ signal at IC951

check line of MAIN PCB is short or not.

Is the

pin1?

YES

Is there

pin4?

YES

Check IC951 and replace.

Check or replace D963.

Check P_CTL from μ-com.

3-25

ELECTRICAL TROUBLESHOOTING GUIDE

POWER SUPPLY ON SMPS BOARD

No -5 V

VCC -7 VA supplied to IC953

Check or replace Q953, Q957.

check line of MAIN PCB is short or not.

No output AMP gate line

Is the

pin2?

YES

Is there

‘H’ signal at Q953

Base?

YES

Is the D959 normal?

YES

Check or replace Q951.

Check P_CTL

from μ-com.

Check or replace D959.

Is the VCC

13 VA supplied to IC952

pin1 to pin3?

Check and replace IC952.

check line of MAIN PCB is short or not.

Is the R952 normal?

YESYES

Check or replace D952, D959.

3-26

Check or replace R952.

ELECTRICAL TROUBLESHOOTING GUIDE

POWER SUPPLY ON SMPS BOARD

No AMP output

Is the

C904 voltage

about 390 V?

YES

Is F911 normal?

YES

Is the

PFC P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC904 pin16?

YES

Check or replace

IC904, Q907 ~ Q910.

Is the

AMP P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC902 pin2?

Check PFC P.CTL

from μ-com.

Replace D908, Q955, PC903.

Check AMP P.CTL

from μ-com.

Replace D908, Q956, PC902.Replace F911.

Is Q905, Q906 OK?

Replace Q905, Q906.

YES

Check or replace IC902 and

check Q905, Q906 gate(pin1)

Components (Resistors, Diodes).

3-27

Check or replace D954, D955.

Check line of MAIN PCB is short or not.

ELECTRICAL TROUBLESHOOTING GUIDE

2. SYSTEM PART

Power on.

“HELLO”

Display on FLD

OK?

YES

When turn

the volume, count is

change?

YES

CN101

cable connection

OK?

YES

CN101

pin11, 22, 25,power

OK?

YES

CN101

pin5, 6, 7 data signal

OK?

YES

Check

CN101 pin3, 4 I2C data

OK?

YES

Check FFC cable.

Check SMPS board.

Check MAIN board.

Replace VFD301.F+/- & VH voltage OK?

Check FFC cable.

FRONT board OK.

Check MAIN board.

3-28

ELECTRICAL TROUBLESHOOTING GUIDE

3. NO AUDIO CHECK

CD FUNCTION

Can

disc insert?

YES

Disc reading OK?

YES

LOAD +, - OK?

YES

Is motor impedance

about 12 Ω?

OPU driving

(Focusing & Tracking) OK?

Check OPU.

(Pick-up module)

Is Motor_open/ close OK?

(IC400 pin6, 7)

YES

Check IC501.

Check loading motor.

Check IC400.

Focusing/

Tracking/ Sled signal

OK?

YES

MON_MPD(CN400 pin22)

About 180 mV?

IC401 pin34 ~ 36

I2S output signal OK?

YES

IC501 pin N1, N2, N4

I2S input signal OK?

YES

IC401

RF & Servo signal

OK?

YES

Check IC501.

3-29

Check FFC cable

to CN400, CN401.

ELECTRICAL TROUBLESHOOTING GUIDE

NO AUDIO CHECK

USB play

When insert USB,

IC501 pin U7, U8, A7, A8

USB_D signal OK?

YES

AUX

USB power USB_5 V

IC303

OK?

YES

Replace IC303.

pin 3, 4 AUX input signal

IC200

OK?

YES

IC200

pin15, 16, 17 I2S input signal

OK?

YES

IC200

pin18 ADC_data output signal

OK?

YES

Check audio cable.

Check IC501.

Replace IC200.

3-30

ELECTRICAL TROUBLESHOOTING GUIDE

NO AUDIO CHECK

POT. IN

pin29, 30 POT. IN input signal

IC200

OK?

YES

IC200

pin15, 16, 17 I2S input signal

OK?

YES

IC200 pin18

ADC_data output signal

OK?

YES

TUNER

Check FRONT board.

Check IC501.

Replace IC200.

IC200 pin1, 2

TUNER_L/R input signal

OK?

YES

IC200

pin15 ~ 17 I2S input

signal OK?

YES

IC200

pin18 ADC data output

signal OK?

YES

TUN200

TUNER_L/R output

signal OK?

YES

Check IC501.

Replace IC200.

3-31

Check +3.3 V of TUN200.

ELECTRICAL TROUBLESHOOTING GUIDE

NO AUDIO CHECK

YES

pin D1,D2,E1 I2S Clock signal

IC501

OK?

YES

IC501

pin E2 I2S data signal

OK?

YES

IC600

PWM data output signal

OK?

YES

Check IC501.

Replace IC600.

3-32

ELECTRICAL TROUBLESHOOTING GUIDE

NO AUDIO CHECK

Pin39 ~ 50 of IC600

FL/FR± signal OK?

YES

IC601,IC603

FL/FR audio signal OK?

YES

Pin13

of IC700, IC801 FL/FR

audio signal OK?

YES

Check IC600.

Check IC601,IC603

Check IC700, IC801.

Check IC600.

Check IC602

Check IC702.

Pin45, 46 of IC600

SW1± signal OK?

YES

IC602

SW1 audio signal OK?

YES

Pin13 of IC702

SW1 audio signal OK?

YES

±66 V, -12 V, ±5 V

power voltage OK?

YES

Q700, Q701,

Q802, Q803

OK?

YES

Check SMPS.

Check Q700, Q701,

Q802, Q803.

Check speaker cable connection.

3-33

Check SMPS.

Check Q706, Q707.

±66 V, -12 V, ±5 V

power voltage OK?

YES

Q706, Q707

OK?

YES

WAVEFORMS OF MAJOR CHECK POINT

1. DSP (IC501)

Fig 1-1. Crystal of RTC 32.768 MHz

(Both ends of R561) X501

This model is not used.

Fig 1-2. Crystal of system 24 MHz

( MAIN DSP : R551, C53B) X500

3-34

2. PWM (IC600)

Fig 2-1. Crystal 24.576 MHz

(IC600 pin4, pin5) X600

Fig 2-2. DSP to PWM I2S

(IC600 pin26 ~ pin30)

3-35

3. SERVO (IC401)

Fig 3-1. Crystal 16.9344 MHz

(X400)

Fig 3-2. CD-16M

(IC401 pin31)

3-36

4. MOTOR DRIVER (IC400)

Fig 4-1. LO- & LO+/ MOT_OPEN &

MOT_CLOSE for Driving TRAY Motor

(IC400 pin6, pin7, pin9, pin10)

Fig 4-2. SL- & SL+ for Driving SPINDLE Motor

(IC400 pin11, pin12)

Fig 4-3. SP- & SP+ for Driving SPINDLE Motor

(IC400 pin17, pin18)

3-37

5. ADC 6. USB

Fig 5. ADC I2S

(IC200 pin16, pin17, pin18)

Fig 6. USB D+/ D-

(CN503 pin4, pin5, pin7, pin8)

2524

3-38

7. BLUETOOTH

BT_TX

BT_RX

BT_RST

BT_TX

BT_RX

BT_RST

BT_TX

BT_RX

BT_RST

Fig 7. BT_TX/ BT_RX/ BT_RST

28 27 26

3-39

3-40

3-41 3-42

IC501

DSP

IC401

RF IC

IC600

PWM

IC100

MICOM

IC200

ADC

IC503

F/S 16M

IC504

SDRAM

IC400

Motor DR

Tuner

MIC

PTB

USB1

USB2

MAIN

module

AUX In

SMPS

Harness

FFC

RL FR

RR W1 W2

Party Thruster

JACK

FRONT

12P

25P

10P

25P

10P

23P

10P

23P

WIRING DIAGRAM

3-43 3-44

BLOCK DIAGRAM

(±5V)

(±66V)

DRIVER OP AMP

FET X 2

DRIVER OP AMP

FET

IRF6775

X 2

DRIVER

OP AMP

FET

IRF6775

X 2

DRIVER OP AMP

FET

IRF6775

X 2

DRIVER

OP AMP

FET

IRF6775

X 2

IC501

Main DSP

(3.3V, 1.2VA)

DECK

MECHANISM

P/UP

(VCC50)

FRONT

VFD

Volume/

Key/switch

(+3.3VA,+12V)

Motor Drive

USB1

USB2

SERVO

(4؎ܓ)

IC201

ADC

IC30A1

PRE,AMP

IC202 PWM

DRM_WEN/CAS/

RAS/SEL/CLK/CKE

AMP_OSC

ADC_DATA

MCS_BCK/LRCK/MCLK

MID L

HIGH L

LOW 1

MID R

HIGH R

IR_IN_RL

RL_OUT_P/N

FL_OUT_P/N

RR_OUT_P/N

FR_OUT_P/N

M00_15

A00_16

SF_DI/DO

SF_CS/SCK

VFD_STB/CLK/DO/RST

MAIN VOL_A/B ,

KEY 1/2/3

OP_SW,CL_SW,UP_SW,DN_SW,D_SENSE

MOT_MUTE,CLOSE,OPEN

A,B,C,D,E,F,PD

SPDO/SLDO

/FOD/TRD

LOAD± ,SLED±,

SPIN±,TR±,F±

D2S+/ -

IR_IN_FL

IR_IN_SW1

IR_IN_RR

IR_IN_FR

PWM_DAT/CLK/RST/DAT

CD_RW/MCLK/LRCK/BCK,

CD_DAT

CD_RST

UART_RX/TX

IC101

MICOM

SCRATCH A/B,

TOP_LED, FRONT_AGL,

MID_AGL, WOOFER_AGL

MIC_DET, PTB_DET,

SEARCH A/B

SW1_OUT_P/N

DRIVER

FET

IRF6775

X 2

LOW 2

IR_IN_SW2

32MB(256Mb )

SDRAM

16MB(128Mb )

S/Flash

8MB(64Mb )

S/Flash

SF_DI/DO

SF_CS/SCK

FAN_CTRL

MIC_DATA_IN

AUX

FM/AM

PTB

MIC1

MIC2

IC603

SLIDE_0

Party Thruster

SPK_EXP

CLK/DAT/LAT

SPK LED

LIGHTING

MIX_DATA

CIRCUIT VOLTAGE CHART

1. CAPACITOR VOLTAGE

3-45 3-46

Location

Value Capacitor

(uF)

Voltage_Spec

(V)

100 V - 10 % 240 V/ 50 Hz + 10 %

Measured voltage

(V)

Measured voltage

(V)

SMPS Board

C904 270 uF 450 V 393 393

C926 47 uF 50 V 7.1 7.15

C927 47 uF 50 V 7.2 7.2

C930 68 uF 450 V 138 336

C936 1000 uF 16 V 5.09 5.11

C937 2200 uF 16 V 5.15 5.15

C944 1000 uF 25 V 13 13.1

C948 220 uF 25 V 7.5 7.6

C957 220 uF 25 V 12.98 12.98

C958 100 uF 16 V 11.9 11.89

C963 3300 uF 25 V 16.3 16.3

C964 220 uF 25 V 12.03 12.1

C966 1000 uF 80 V 67 66.9

C968 1000 uF 80 V 66 66

MAIN/ FRONT Board

C318 47 uF 16 V 3 3

C328 47 uF 16 V 6 6

C334 1 uF 50 V 31 31

C335 1 uF 50 V 18 18

C336 1 uF 50 V 21 21

C337 1 uF 50 V 18 18

C402 100 uF 16 V 5 5

C404 47 uF 16 V 3.3 3.3

C409 47 uF 16 V 3.3 3.3

C416 47 uF 16 V 1.7 1.7

C418 3.3 uF 50 V 1.7 1.7

C427 220 uF 16 V 5.1 5.1

C603 220 uF 6.3 V 1.3 1.3

C744 100 uF 16 V 0.04 0.04

C867 2200 uF 80 V 65 65

C868 2200 uF 80 V 65 65

CE300 100 uF 16 V 5.1 5.1

CE301 220 uF 6.3 V 3 3

CE600 220 uF 6.3 V 3.25 3.25

CE800 1000 uF 80 V 34 34

CE801 1000 uF 80 V 34 34

3-47 3-48

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD DIAGRAM

(TOP VIEW)

3-49 3-50

SMPS P.C.BOARD DIAGRAM

(BOTTOM VIEW)

NOTE) Warning

Parts that are critical with respect to risk of fire or electrical shock.

3-51 3-52

2. MAIN P.C.BOARD DIAGRAM

(TOP VIEW)

3-53 3-54

MAIN P.C.BOARD DIAGRAM

(BOTTOM VIEW)

3-55 3-56

3. FRONT P.C.BOARD DIAGRAM

(TOP VIEW)

3-57 3-58

FRONT P.C.BOARD DIAGRAM

(BOTTOM VIEW)

3-59 3-60

4. JACK P.C.BOARD DIAGRAM

(TOP VIEW)

(BOTTOM VIEW)

SECTION 4

MECHANISM (DM14B)

CONTENTS

DECK MECHANISM DISASSEMBLY

1. Cover Top ............................................................................................................................................... 4-2

2. Clamp Assembly ..................................................................................................................................... 4-2

2-1. Plate ................................................................................................................................................. 4-2

2-2. Magnet ............................................................................................................................................. 4-2

2-3. Clamp ............................................................................................................................................... 4-2

3. Tray Disc ................................................................................................................................................. 4-3

4. Pick Up Assembly ................................................................................................................................... 4-4

5. Base Up/Down ........................................................................................................................................ 4-4

6. Belt Loading ............................................................................................................................................ 4-5

7. Gear Pulley ............................................................................................................................................. 4-5

8. Gear Loading .......................................................................................................................................... 4-5

9. Guide ....................................................................................................................................................... 4-5

10. Deck PCB Assembly ............................................................................................................................... 4-5

11. Motor Assembly ...................................................................................................................................... 4-5

12. FFC Cable ............................................................................................................................................... 4-5

DECK MECHANISM EXPLODED VIEW (DM14B) ........................................................................................... 4-6

4-1

(S1)

DECK MECHANISM DISASSEMBLY

Cover Top

Clamp Assembly

Plate

Magnet

Clamp

(L1)

< Figure A >

1. Cover Top

1) Remove the 2 screws (S1).

2) Unhook the 4 Locking Tabs (L1) by using a flat-head screwdriver.

3) Remove the Cover Top.

< Figure B >

2. Clamp Assembly

1) Place the Clamp Assembly as Figure B.

2) Bending the Cover Top in direction of arrow (2) as Figure B.

3) Separate the Clamp Assembly from the Cover Top.

2-1. Plate

1) Turn the Plate to a counterclockwise direction and then lift up the Plate.

2) Remove the Plate.

2-2. Magnet

Remove the Magnet.

2-3. Clamp

Remove the Clamp.

4-2

DECK MECHANISM DISASSEMBLY

Emergency eject hole

Tray Disc

< Bottom side view >

Tray Disc

< Figure C >

(H1)

MD Sub

Assembly

1 1

Tray Disc

< Figure D >

3) Grasp the both sides of the Tray Disc and lift it up as Figure D, and then pull the Tray Disc until it is separated from the MD Sub Assembly completely.

3. Tray Disc

Insert and push a flat-head screwdriver in the Emergency eject hole (H1) at the right side, so that the Tray Disc is ejected about 15 ~ 20 mm.

2) Pull the Tray Disc until it is locked.

Guide

Tray Disc

< Figure E >

Note

• When reassembling place the Guide as Figure E.

4-3

DECK MECHANISM DISASSEMBLY

RED B

ORN

Gasket Tape

Rubber Damper

< Bottom side view >

FFC Cable

(S2)

Deck PCB Assembly

Pick Up Assembly

Base Up/Down

(L2)

Base Main

(D)

(B)

(H2)

Figure G-3

(A)

Figure G-2Figure G-1

(C)

Guide

(B)

Base Up/Down

< Figure F >

4. Pick Up Assembly

1) Detach the Gasket Tape.

2) Disconnect the wires (BLK, RED, BRN, ORN) from the Deck PCB Assembly by desoldering.

3) Remove the 4 screws (S2).

4) Disconnect the FFC Cable from the Pick Up Assembly.

5) Remove the 4 Rubber Dampers.

< Figure G >

5. Base Up/Down

Unlock the Locking Tab (L2) in direction of arrow and then lift up the Base Up/Down to separate it from the Base Main.

Note

• When reassembling move the Guide in direction

of arrow (A) until it is positioned as Figure G-1.

• When reassembling insert the (B) portion of the

Base Up/Down in the (C) portion of the Guide as Figure G-2.

• When reassembling insert the (D) portion of the

Base Up/Down in the Hole (H2) of the Base Main as Figure G-3.

4-4

DECK MECHANISM DISASSEMBLY

RED B

ORN

Gear Loading

Gear Pulley

(L3)

< Bottom side view >

Belt Loading

Base Main

(A)

Figure H-1

Guide

(B)

Base Main

(L4)

< Bottom side view >

6. Belt Loading

Remove the Belt Loading.

7. Gear Pulley

Unlock the Locking Tab (L3) in direction of arrow and then separate the Gear Pulley from the Base Main.

8. Gear Loading

Remove the Gear Loading.

9. Guide

1) Move the Guide in direction of arrow (A) as Figure H-1.

2) Separate the Guide from the Base Main.

Motor Assembly

(S3)

< Figure H >

10. Deck PCB Assembly

11. Motor Assembly

12. FFC Cable

Deck PCB

< Bottom side view >

Deck PCB Assembly

Assembly

1) Disconnect the wires (RED, BK) form the Deck PCB Assembly by desoldering.

2) Remove the 1 screw (S3).

3) Separate the Deck PCB Assembly from the Base Main.

Unlock the Locking Tab (L4) in direction of arrow and then separate the Motor Assembly from the Base Main.

Remove the FFC Cable.

4-5

DECK MECHANISM EXPLODED VIEW (DM14B)

1439

1013

1026

1016

1015

1012

1003

1024

1437

1049

1020

1005

1004

1024

1001

1002

1024

A001

1030

1437

1024

1437

A006

1019

1018

1011

A005

1043

1045

1439

4-6

LG CJ87, CJS87F Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual