Internal Use Only

Website http://biz.lgservice.com

SERVICE MANUAL
Mini Hi-Fi AUDIO
SERVICE MANUAL

MODEL: OM7550
MODEL: OM7550

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

P/NO : AFN77277076 SEPTEMBER, 2015

 CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST

1-1
 SECTION 1
SUMMARY

CONTENTS

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

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

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

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

PROGRAM DOWNLOAD & UPDATE GUIDE .................................................................................................. 1-8

1. AUDIO PROGRAM ................................................................................................................................... 1-8
2. CD PROGRAM ......................................................................................................................................... 1-9
3. EQ PROGRAM ....................................................................................................................................... 1-10

SPECIFICATIONS ........................................................................................................................................... 1-11

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

Pressure
Magnet
Pressure

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
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components
are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components
can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must be
taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magne-
tism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.
5) Workers should be grounded by an armband (1 M)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Armband

Resistor
(1 M)
Resistor
Conductive
(1 M)
Sheet

1-4
 ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.

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

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

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

INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.

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

SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.

1-5
 HIDDEN KEY MODE
Push both Front key and RCU key to activate it for 5 seconds.

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

 Front Key : STOP
 RCU Key : STOP

2. Check Version and Option code

 Front Key : STOP
 RCU Key : PLAY/PAUSE
 You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.

3. Clear EEPROM
 Front Key : STOP
 RCU Key : SKIP-

4. Edit EEPROM
 Front Key : STOP
 RCU Key : SKIP+
 You can change the digit of option by SKIP+/-.
 You can edit 0~f by REPEAT or PLAY/PAUSE key.

5. Bluetooth DUT
 Front Key : STOP
 RCU Key : PROGRAM
 Bluetooth model only

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

 Front Key : STOP
 RCU Key : EQ

7. Amp Clip On/Off

 Front Key : STOP
 RCU Key : Mute
Amp Clip Mode Change (Amp Clip On --> Amp Clip Off --> Level Down display).

1-6
 SERVICE INFORMATION FOR EEPROM

POWER ON

It is possible at any function.

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

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

FLD “OP00-…..”

Move to appropriate position

And make changes
with RMC “ , ,dM, REPEAT” key.

Press STOP Key

VFD “WRITE OK”

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

VFD “E2P CLR”

Completed

1-7
 PROGRAM DOWNLOAD & UPDATE GUIDE
1. AUDIO PROGRAM
Download program file name must be MICOM_OM9550_YYMMDDX.HEX
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device
and disable the security software, then download the file to your set.
Downloading file proceeds in the same way at USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,
nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device at USB function

SEARCH


MICOM UP


FINISH


Auto POWER OFF

1-8
2. CD PROGRAM
Download program file name must be HG590_OM9550_YYMMDDX.bin
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device
and disable the security software, then download the file to your set.
Downloading file proceeds in the same way at USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,
nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device at USB function

SEARCH


FIRMWARE


FINISH


Auto POWER OFF

1-9
3. EQ PROGRAM
Download program file name must be EQ_PRG_OMXX50_YYMMDDX_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

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device at USB function

SEARCH


EQ UP


FINISH


Auto POWER OFF

1-10
 SPECIFICATIONS
• GENERAL
Power requirements Refer to the main label.
Power consumption Refer to the main label.
Networked standby : 0,4 W
(If all network ports are activated.)
Dimensions (W x H x D) 430 mm x 765 mm x 468 mm
Net Weight (Approx.) 22.7 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 60 %
Bus Power Supply 5V 500 mA

• INPUTS / OUTPUTS
AUX IN / OUT 2,0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)
PORT. IN 1,2 Vrms (3.5 Ø jack)
MIC 20 mV

• TUNER
FM Tuning Range 87,5 to 108,0 MHz or 87,50 to 108,00 MHz

• CD
Frequency Response 40 to 20 000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 80 dB

• AMPLIFIER
Total output 1000 W
FRONT 500 W x 1 (6 Ω at 150 Hz)
Subwoofer 500 W x 1 (6 Ω at 1 kHz)
THD 20 %

• Design and specifications are subject to change without notice.

1-11
1-12
 SECTION 2
CABINET & MAIN CHASSIS

CONTENTS

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

1. HOW TO DISASSEMBLE THE SIDE COVER (LEFT & RIGHT) ............................................................. 2-2

EXPLODED VIEWS ........................................................................................................................................... 2-5

1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-5
2. DECK MECHANISM SECTION (DM19) ................................................................................................... 2-7
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-9

2-1
 DISASSEMBLY INSTRUCTIONS
1. HOW TO DISASSEMBLE THE SIDE COVER (LEFT & RIGHT)
Step 1) Insert JIG into groove and then raise Cover_Side with a lever(JIG) to outside direction.

-,*

Figure 1

Step 2) Tap(Push-silde) Cover_Side to back direction.

Figure 2

2-2
Step 3) Seperate Cover_Side to out direction.

Figure 3

2-3
2-4
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
468
250

A
251
CABLE5

286
262 468
468
J
K
443
468
B
C A

I
D
443 SMPS D 267
A47 B
H
A41 C
468 MAIN
260 285
252 518 A46 M
F
E G
264 O
L
H

512 263
254
N 265 518
J
443
VFD
270
A43 443
277
N 443 512
A44 E G 282 284
O
TOP
283
F 268
R

512

P I
Q
443
468
K 282
R
A42 A49 443 275 443
266
Q
261
FRONT
P

B/T 281
A52 278
468 512
255
256
257
CABLE3
CABLE2 A50 276
L M
512
512
279

2-5 2-6
2. DECK MECHANISM SECTION (DM19AA)

1439

1002
A001

1006

1005 1001
1026 1003 1004

1030
1024
1437

1437

1024 1024
1012
1049
1437
1013 1016 1015 1024

1020

1011

A006

1019 1043

1018 A005
1045
1439

2-7 2-8
3. PACKING ACCESSORY SECTION

300 Power Cord

825 FM Antenna 801 Owner’s manual

900 Remote Control 808 Batteries

803 Packing
803 Packing

804 Bag

803 Packing

803 Packing

802 Box

2-9
2-10
 SECTION 3 ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ................................................................................................................................................ 3-2
1. NO POWER ............................................................................................................................................................... 3-2
2. NO AMP POWER....................................................................................................................................................... 3-3
3. NO BOOTING WHEN POWER ON THE SET ........................................................................................................... 3-4
4. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ........................................................................................ 3-5
5. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT ............................................................................................. 3-6
6. NO POWER ON (STANDBY LED IS BLINKING) ...................................................................................................... 3-7
7. SPEAKER NO AUDIO................................................................................................................................................ 3-8
8. NO BOOTING IN CD/USB FUNCTION ..................................................................................................................... 3-9
9. NO OPERATION OF MD ......................................................................................................................................... 3-14
10. NO SOUND .............................................................................................................................................................. 3-19

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

1. POWER SUPPLY ON SMPS BOARD ..................................................................................................................... 3-25
2. SYSTEM PART ........................................................................................................................................................ 3-28
3. NO AUDIO CHECK .................................................................................................................................................. 3-29
4. NO LIGHTING (SPEAKER LED) ............................................................................................................................. 3-34

WAVEFORMS OF MAJOR CHECK POINT........................................................................................................................ 3-35

1. DSP (IC501) ............................................................................................................................................................. 3-35
2. PWM (IC202)............................................................................................................................................................ 3-36
3. SERVO (IC401) ........................................................................................................................................................ 3-37
4. MOTOR DRIVER (IC400) ........................................................................................................................................ 3-38
5. ADC (IC201) ............................................................................................................................................................. 3-39
6. USB (CN502) ........................................................................................................................................................... 3-39
7. BLUETOOTH (CN504) ............................................................................................................................................. 3-40

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

BLOCK DIAGRAMS ............................................................................................................................................................ 3-43

1. SYSTEM BLOCK DIAGRAM.................................................................................................................................... 3-43
2. POWER BLOCK DIAGRAM ..................................................................................................................................... 3-45

CIRCUIT DIAGRAMS .......................................................................................................................................................... 3-47

1. SMPS_POWER #1 CIRCUIT DIAGRAM ................................................................................................................. 3-47
2. SMPS_POWER #2 CIRCUIT DIAGRAM ................................................................................................................. 3-49
3. MAIN_CD DSP CIRCUIT DIAGRAM ....................................................................................................................... 3-51
4. MAIN_ADC/PWM CIRCUIT DIAGRAM.................................................................................................................... 3-53
5. MAIN_RF SERVO CIRCUIT DIAGRAM .................................................................................................................. 3-55
6. MAIN_AMP CIRCUIT DIAGRAM ............................................................................................................................. 3-57
7. MAIN_AUX OUT/ VFD PWR CIRCUIT DIAGRAM .................................................................................................. 3-59
8. FRONT CIRCUIT DIAGRAM.................................................................................................................................... 3-61
9. VFD/RMC1 CIRCUIT DIAGRAM.............................................................................................................................. 3-63
10. TOP CIRCUIT DIAGRAM ......................................................................................................................................... 3-65

CIRCUIT VOLTAGE CHART ............................................................................................................................................... 3-67

1. ICs ............................................................................................................................................................................ 3-67
2. CAPACITORS .......................................................................................................................................................... 3-68
3. CONNECTORS ........................................................................................................................................................ 3-69
4. ZENER DIODES ...................................................................................................................................................... 3-70

PRINTED CIRCUIT BOARD DIAGRAMS ........................................................................................................................... 3-71

1. SMPS P. C. BOARD (TOP VIEW) ........................................................................................................................... 3-71
2. SMPS P. C. BOARD (BOTTOM VIEW) ................................................................................................................... 3-73
3. MAIN, VFD/RMC1 P.C.BOARD (TOP VIEW) .......................................................................................................... 3-75
4. MAIN, VFD/RMC1 P.C.BOARD (BOTTOM VIEW) .................................................................................................. 3-77
5. FRONT P.C.BOARD (TOP VIEW) ........................................................................................................................... 3-79
6. FRONT P.C.BOARD (BOTTOM VIEW) ................................................................................................................... 3-79
7. TOP(VOLUME_FR1) P.C.BOARD (TOP VIEW)...................................................................................................... 3-81
8. TOP(VOLUME_FR1) P.C.BOARD (BOTTOM VIEW).............................................................................................. 3-83

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/ BRIDGE DIODE/ THERMISTOR

1-1-1. Solution
Please check and replace F901, BD901, TH900, TH901 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 multimeter.
3) Check if the NTC thermistor TH900~TH902 is normal or open.

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

< F901 > < BD901 > < TH900, TH901 >
If F901 is not short-circuit, If BD901 is short-circuit, If TH900~TH901 is open,
replace it with a same replace it with a new one. replace it with a new one.
specifications one.

3-2
 ONE POINT REPAIR GUIDE
2. NO AMP POWER
If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide.

2-1. FUSE/ FET

2-1-1. Solution
Please check and replace F911, Q905~Q906 on SMPS board.

2-1-2. 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).

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

< F911 > < Q905~Q906 >

If F911 is not short-circuit, If Q905~Q906 is short-circuit,
replace it with a same specifications one. replace it with a new one.

3-3
 ONE POINT REPAIR GUIDE
3. 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.

3-1. IC501
3-1-1. Solution
Replace IC501 on MAIN board.

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

1) Check the 5.6 VA (CN106) and DVCC_3.3 V (IC505) in standby mode.
 If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC505.
2) Check 5.6 VA, +12 V, FL+, FL-, an +39 V when power on the set.
 If the set doesn’t work regardless of what the KEY2 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.

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

X501
(32.768 kHz)

KEY2
(R526) X500
(24 MHz)

< MAIN board top view >

R522
PWR_CTRL

< MAIN board bottom view >

3-4
 ONE POINT REPAIR GUIDE
4. VFD IS NOT DISPLAYED WHEN POWER ON THE SET
When power on the set, any icons or characters on VFD are not displayed.

4-1. VFD (DIG300)

4-1-1. Solution
Please check and replace DIG300 on FRONT board.

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

1) Check if 39 V, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if the IC501 outputs VFD_CLK, VFD_DO and VFD_STB to the FRONT board.
3) Check if the VFD grid current amplifier circuit on the FRONT board.
Check the drive signal to the transistor’s base.
 If the control signals from VFD (DGND, VDD) isn’t output, replace VFD with a new one.

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

CN3E14
VFD_D0,
VFD_STB,
VFD_CLK

R327(TP304) about
Q301 Emitter 30 Vp-p

< VFD schematic > < Waveform of the grid current driver>

3-5
 ONE POINT REPAIR GUIDE
5. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT
Audio signal output is small or not. when you power on the Middle Power Mini System.

5-1. AMP IC (IC700, IC701, IC705)

5-1-1. Solution
Replace IC700, IC701, IC705 on MAIN board.

5-1-2. 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, IC701, IC705 on your eyes.
3) Check the audio signal output check (pin13 of IC700, IC701, IC705).
First, Check the PWM Data input (pin3 of IC700, IC701, IC705)
4) If the audio signal output has no output, try to change IC which has no output.
5) Lastly, check Speaker Terminal (CN701, CN702).

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

IC700, IC701, IC705

< MAIN board top view >

3-6
 ONE POINT REPAIR GUIDE
6. NO POWER ON (STANDBY LED IS BLINKING)
It doesn’t turn on, and blinks standby LED(Red).

6-1. AMP FETs

6-1-1. Solution
Replace AMP FET on MAIN board.

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

1) This symptom occurs, when DC protection is detected. Main reasons are like below.
- When some of AMP FETs dead.

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

AMP FETs
(Q705~Q708, Q717, Q718)

AMP FET : IRF6775

< MAIN board top view >

* You can see FET after removing heatsink.

* Notice for Service
Before repair Main Assy, you need to discharge SMPS.
Notice for FET service After then, open the connector.
- In case of RF6775, Metal case, FET Drain, You should try to change both of +/- FET and Driver IC
has electric potential. So be careful when you as a pair.
deal with it.

3-7
 ONE POINT REPAIR GUIDE
7. SPEAKER NO AUDIO
Speaker No Audio

7-1. AMP IC (IC700, IC701, IC705)

7-1-1. Solution
Replace IC700, IC701, IC705 on MAIN board.

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

1) Check supply voltage of AMP(CN110) & 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).
CSD has about 5 V on normal state.
When AMP has problem, CSD is LOW state or keep change LOW to HIGH.

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

CN110
pin1, 2 : +66 V
pin3, 4 : PGND
pin5, 6 : -66 V

< MAIN board top view >

pin5 of ICs  CSD

< MAIN board top view > < MAIN - AMP circuit >

3-8
 ONE POINT REPAIR GUIDE
8. 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.

8-1. NO VCC33, VCC12

8-1-1. Solution
Please check and replace IC505, IC500 on MAIN board.

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

1) Check Voltage of IC505 pin3 on MAIN board.
 If IC505 pin3(about 4.9 V) & D500 Input 5.6 VA doesn’t come out, check 5.6 VA from SMPS board.
2) If IC505 pin3(about 4.9 V) is normal, check the PWR_CTRL(IC505 pin2) is high (about 3.3 V).
 If PWR_CTRL isn’t high, check pin B2 of IC501 & R524, R522.
3) If PWR_CTRL is high, check R524 and if there’s no defective component then replace IC505.
4) If 3.3 V(VCC33) is normal, check 1.2 V output(pin2) voltage of IC500.
 If 1.2 V of IC500 pin2 doesn’t come out, then replace IC500.

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

IC500

< MAIN board top view >

IC505

D500

< MAIN board bottom view >

3-9
 ONE POINT REPAIR GUIDE
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.

8-2. CRYSTAL (X500)

8-2-1. Solution
Replace X500 on MAIN board.

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

1) If 3.3 V & 1.2 V is normal, check Reset “High” of IC501 pinT12 on MAIN board.
 If MAIN_RESET isn’t high, check MICOM(IC101) 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 R508, R5C5, C502, C503 around crystal (X500).
 If there’s no defective component, then replace X500.

8-2-3. Service hint (Any picture / Remark)

XI

X500
IC501
XO

X500
< MAIN board top view >
< Signal waveform >

3-10
 ONE POINT REPAIR GUIDE
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.

8-3. SERIAL FLASH (IC503)

8-3-1. Solution
Please check and replace IC503 on MAIN board.

8-3-2. 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 pin8, 6, 1, 2, 5 doesn’t come out, check damping resistor (R535,R536,R534) and pull up resistor
(R564,R563) 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).

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

VCC
CS#

IC503 CLK
DO

< MAIN board bottom view > < Signal waveform >

3-11
 ONE POINT REPAIR GUIDE
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.

8-4. SDRAM (IC502)

8-4-1. Solution
Please check and replace IC502 on MAIN board.

8-4-2. How to troubleshoot (Countermeasure)

1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
 If pin17(#CAS), pin18(#RAS), pin19(#CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
check damping resistor (R568, R570, R544, R547).
2) If resistor is OK, then replace IC502(SDRAM).
3) After change IC502, if It is still not below waveform, Check IC501 (DSP IC).

8-4-3. Service hint (Any picture / Remark)

V CC
Reset
a ddress

da ta
IC502

/ CS

R AS

/WE

C AS

< MAIN board bottom view > < Signal waveform >

3-12
 ONE POINT REPAIR GUIDE
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.

8-5. DSP (IC501)

8-5-1. Solution
Please check and replace IC501 on MAIN board.

8-5-2. 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).

8-5-3. Service hint (Any picture / Remark)

R594
PGPB12
(Yellow)
IC501

R598
PAD19
(Green)

R597
PAD20
(Pink)

< MAIN board top view > < Bootstrap waveform >

3-13
 ONE POINT REPAIR GUIDE
9. 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.

9-1. SPINDLE MOTOR

9-1-1. Solution
Replace IC401 or IC400 on MAIN board.

9-1-2. 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.

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

SP+
pin6 of CN401
SP-
zwR pin8 of CN401

IC400
zw T

< Waveform of SP- & SP+ < MAIN board top view >
for driving SPINDLE motor >

3-14
 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.

9-2. SLED MOTOR

9-2-1. Solution
Replace IC401 or IC400 on MAIN board.

9-2-2. 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 IC401.
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.

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

SL+
zsR pin7 of CN401
SL-
pin9 of CN401
zs T
IC400

< Waveform of SLED- & SLED+ < MAIN board top view >
for driving SLED motor >

3-15
 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 tray open/close motor
among them.

9-3. TRAY OPEN/ CLOSE MOTOR

9-3-1. Solution
Replace IC401 or IC400 on MAIN board.

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

1) Check MOT_OPEN & MOT_CLOSE signals from pinK4 & 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.

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

MOT_OPEN LO+
pin7 of IC400 pin4 of CN401
sv T MOT_CLOSE LO-
svROylkP pin6 of IC400 pin2 of CN401
tv{†vwlu
tv{†jsvzl

< Waveform < MAIN board top view >

for driving TRAY open/ close motor >

3-16
 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 pickup module in MD doesn’t work. This step is for checking the laser tracking actuator.

9-4. LASER TRACKING ACTUATOR

9-4-1. Solution
Replace IC401 or IC400 on MAIN board.

9-4-2. 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.

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

TR-
pin17 of CN400
TR+
pin16 of CN400
{yT ›–Gju[W[
{yRG›–Gju[W[

< Waveform of T± < MAIN board top view >

for driving TRACKING actuator >

3-17
 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 pickup module in MD doesn’t work. This step is for checking the laser focusing actuator.

9-5. LASER FOCUSING ACTUATOR

9-5-1. Solution
Replace IC401 or IC400 on MAIN board.

9-5-2. 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 pin13 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 pickup 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.

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

F-
pin18 of CN400
F+
pin15 of CN400
mRG›–Gju[W[

mT ›–Gju[W[

< Waveform of F± < MAIN board top view >

for driving FOCUSING actuator >

3-18
 ONE POINT REPAIR GUIDE
10. NO SOUND
There is no sound output in the USB function, repair the set according to the following guide.

10-1. USB FUNCTION

10-1-1. Solution
Replace IC501 on MAIN board, ICA201 on TOP board.

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

1) Check +5 VU to USB board.
 if +5.6 VA to pin1 of ICA201(LDO) doesn’t come out, check pin8 & 9 of CN106.
 if +5.6 VA is normal & +5 VU of ICA201 pin2 doesn’t come out, then replace ICA201.
2) Check “Digital audio AMP block”.

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

2.0 1.1

USB1 USB2
SCRATCH A/B,
CD_RST
M_VOL_A/B, DAC AUX OUT
DRV632
FAN_CTRL /2, PCM5101
DJ Effect Scratch/Level

D+
BT_TX/RX

BT_PCM_BUFFER
D1+/-

CD_RW/ MCLK/ LRCK/ BCK,

CD_DAT
AUX IN
MCS_BCK/LRCK, MCLK

D2S+/ -
MOT_MUTE,CLOSE,OPEN
AUX_DATA

IC101
Micom IC201
ADC

DRM_WEN/CAS/
RAS/SEL/CLK/CKE (+3.3V_CD, VCC1.2) UART_RX/TX
CS5346 TUNER
(FM/AM) D-
M00_15 PTB
A00_16 ADC_DATA
MLC3730
Main DSP For AUX MCS_BCK/LRCK/MCLK
SF_DI/DO
SF_CS/SCK
PGPC08

For MIC
PRE, AMP MIC 1
PCM1808
SF_DI/DO
S4308 MIC 2
SF2_CS/SCK
PWM_LRCK/BCK/DATA

(± 5 V ) (± 66.5 V )
DSP_O_DATA

IR_IN_FL DRIVER FET

AMP_OSC OP AMP FRONT(SE)
IRS2092 IRF6775 500 W
AZ4580
FL_OUT_P/N X2

PS9860
SW1_OUT_P/N IR_IN_SW DRIVER FET SW(SE)
PWM OP AMP
IRS2092 IRF6775 500 W
AZ4580
X2
SW2_OUT_P/N
EXP_DATA

IR_IN_SW DRIVER FET SW(BTL) 1000 W

OP AMP
IRS2092 IRF6775
AZ4580
X2

USB D+/D- (CN502 pin5, 6 & 8, 9)

< USB function signal flow > < Waveform of USB D± signal >

3-19
 ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the AUX function, repair the set according to the following guide.

10-2. AUX FUNCTION

10-2-1. Solution
Replace IC201 on MAIN board.

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

1) Check AUX_L/R signals to IC201 (pin23, 24).
2) Check if MCS_BCK, MCS_LRCK & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC/MIC_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.
4) 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.
5) Check if the digital audio AMP block is okay.
 If AMP is damaged, replace it with a new one.

10-2-3. Service hint (Any picture / Remark)

AUX_R to R209
AUX_L to R210
AUX_L/R
IC201 AUX
CS5346
ADC/MIC_DATA to R212
MCS_MCLK

IC501
ADC/MIC_DATA

MCS_BCK
MCS_BCK to R213
MCS_LRCK to R215
IC202
MLC3730 MCS_LRCK
PS9860 IR AMP

IC201
IRS2092+IRF6775
MIX_DATA_OUT PWM
MCS_MCLK to R216

< AUX function signal flow > < MAIN board bottom view >

3-20
 ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the PORT. IN function, repair the set according to the following guide.

10-3. PORT. IN FUNCTION

10-3-1. Solution
Replace IC201 on MAIN board.

10-3-2. How to troubleshoot (Countermeasure)

1) Check PT_L/R signal from FRONT board to MAIN board.
2) Check if PT_LR is entered pin1 & 3 of CN201  pin1 & 3 of CNA304.
3) Check PT_L/R signals to IC201(pin9, 10).
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. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

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

POT. IN
T-
T
IC201
CS5346
POT_L/R
VOLUME
Board
IC201
MCS_MCLK ADC/MIC_DATA

IC501 MCS_BCK
IC202 IR AMP
MLC3730 MCS_LRCK
PS9860 IRS2092+IRF6775
MIX_DATA_OUT PWM

PT_L to R228
PT_R to R227

< PORT. IN function signal flow > < MAIN board bottom view >

3-21
 ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the TUNER function, repair the set according to the following guide.

10-4. TUNER FUNCTION

10-4-1. Solution
Replace IC201, TU500 on MAIN board.

10-4-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_L/R is entered from pin1 & 3 of TU500 to IC201(pin26, 27).
 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 TU500.
If it doesn’t work, replace TUNER with a new one.
2) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC201.
3) 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.
4) Check the following I2S audio 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.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

10-4-3. Service hint (Any picture / Remark)

TUNER_L to pin26
TUNER TUNER_R to pin27
T-
T TUNER_L/R
IC201 Jack
CS5346 Board

MCS_MCLK ADC/MIC_DATA

IC501 MCS_BCK
MCS_LRCK
IC202 IR AMP
ADC/MIC_DATA to R212
MCS_BCK to R213
MLC3730 PS9860 IRS2092+IRF6775

MIX_DATA_OUT PWM
IC201
MCS_LRCK to R215
MCS_MCLK to R216

< TUNER function signal flow > < MAIN board bottom view >

3-22
 ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the MIC IN function, repair the set according to the following guide.

10-5. MIC IN FUNCTION

10-5-1. Solution
Replace ICA301 on FRONT board, IC206 on MAIN board.

10-5-2. How to troubleshoot (Countermeasure)

1) Check MIC_SIG signal to pin5 of CN201.
 If no signal, check the signal to pin5 of CN304 on the FRONT board.
Check if the signal is entered from pin5 of CN201 to MAIN board.
2) Check if MIC_SIG is entered from pin5 of CN201 to pin3, 12 to ICA301 (MIC AMP).
 If no signal output, check +3.3V for ICA301, replace ICA301 with a new one if it has a problem.
3) Check if MCS_BCK, MCS_MLCK & MCS_LRCK is entered from IC501 to IC206.
Check if MIC_DATA_IN is entered from pin9 of IC206 to pinT1of IC501.
 If no signal, check +5 V & +3.3 V for IC206. If it is abnormal, change replace it a new one.
4) Check the following I2S signal flow from IC206 to IC501.
 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. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

10-5-3. Service hint (Any picture / Remark)




2.0 1.1



USB1 USB2
SCRATCH A/B,
CD_RST
M_VOL_A/B, DAC AUX OUT
DRV632
FAN_CTRL /2, PCM5101

IC206
DJ Effect Scratch/Level
BT_TX/RX

BT_PCM_BUFFER
D1+/-

CD_RW/ MCLK/ LRCK/ BCK,

CD_DAT
AUX IN
MCS_BCK/LRCK, MCLK

D2S+/ -
MOT_MUTE,CLOSE,OPEN
AUX_DATA

IC101
Micom IC201

 MCS_MCLK. pin6
ADC
CS5346 TUNER
(FM/AM)
DRM_WEN/CAS/
RAS/SEL/CLK/CKE (+3.3V_CD, VCC1.2) UART_RX/TX

M00_15 PTB

 MCS_LRCK. pin7
A00_16 ADC_DATA
MLC3730
Main DSP For AUX MCS_BCK/LRCK/MCLK
SF_DI/DO
SF_CS/SCK
PGPC08

 MCS_BCK. pin8
For MIC
PRE, AMP MIC 1
PCM1808
SF_DI/DO
S4308 MIC 2
SF2_CS/SCK

 MIC_I_DATA. pin9
 MIC_OUTPUT. pin14

< MIC IN function signal flow > < MAIN board top view >

3-23
 ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the Bluetooth function, repair the set according to the following
guide.

10-6. BLUETOOTH FUNCTION

10-6-1. Solution
Replace IC501 on the MAIN board or B/T module on the Front Panel.

10-6-2. How to troubleshoot (Countermeasure)

1) Check BT_RX, BT_TX signal to pin4, 6 of CN504.
 If no signal, check the signal to pin4, 6 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, 6 of CN504 to pin169, 170 to IC501 (DSP).
3) Check if MIC_BCK, MIC_MLCK & MIC_O_DATA is entered from IC501 to IC600.
 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 IC600.
 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. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

10-6-3. Service hint (Any picture / Remark)

B/T Module

BT_CTS. pin8 CN504

BT_RX,
BT_TX BT_RTS. pin9
IC501
MLC3730
IC202 BT_RX. pin4
PS9860
PWM BT_TX. pin6
MCS_BCK
MCS_LRCK
MIX_DATA_OUT

IR AMP
IRS2092+IRF6775 BT_TX. R5A7
BT_RX. R5B9
BT_CTS. R5B8
BT_RTS. R5A3

< Bluetooth function signal flow > < MAIN board top view >

3-24
 ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD

No output 5.6 VA

NO
Is the F901 normal? Replace F901 (same fuse).

YES

NO
Is BD901 normal? Replace BD901.

YES

Is the VCC NO
(11 V ~ 25 V) supplied to IC901 Is D960/ D961 normal?
pin4?

YES

Power line of MAIN PCB is short. Check or replace D960/ D961.

No 12 V

Is the NO
VCC 12 VA supplied to IC951 Check or replace D965.
pin1?

YES

Is there NO
‘H’ signal at IC951 Check P_CTL from μ-com.
pin4?

YES

Check and replace IC951. Or check

line of MAIN PCB is short or not.

3-25
 ELECTRICAL TROUBLESHOOTING GUIDE

No -5 V

Is the NO NO
VCC -7 VA supplied to IC953 Is the D959 normal? Check or replace D959.
pin2?

YES YES

Check or replace Q951.

Is there NO
‘H’ signal at Q953 Check P_CTL from μ-com.
Base?

YES

Check or replace Q953, Q957.

Or check line of MAIN PCB is
short or not.

No output AMP gate line

Is the VCC NO NO
13 VA supplied to IC952 Is the R952 normal? Check or replace R952.
pin1 to pin3?

YES YES

Check and replace IC952.

Or check line of MAIN PCB is Check or replace D952, D959.
short or not.

3-26
 ELECTRICAL TROUBLESHOOTING GUIDE

No AMP output

Is the NO Is the NO
C904 Voltage PFC P.CTL OK? Check PFC P.CTL from μ-com.
about 390 V?

YES YES

Is the NO
VCC 12 V supplied to Replace D908, Q955, PC903.
IC904 pin16?

YES

Check or replace
IC904, Q907~Q910.

YES Is the NO
Is F911 normal? AMP P.CTL OK? Check AMP P.CTL from μ-com.

NO YES

Is the NO
Replace F911. VCC 12 V supplied to Replace D908, Q956, PC902.
IC902 pin8?

NO
YES
Is Q905~Q906 OK?

NO

Check or replace IC902 and Check or replace D954~D955.

Replace Q905~Q906. Check Q905~Q906 gate(pin1) Check line of MAIN PCB is
Components (Resistors, Diodes). short or not.

3-27
 ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART

Power on.

“HELLO” NO CN605 NO
Display on FLD cable connection Check FFC cable.
OK? OK?

YES YES

CN605
NO
pin7, 14, 15, 16 power Check SMPS board.
OK?

YES

CN605
NO
pin8, 9, 10 data signal Check MAIN board.
OK?

YES

NO
FL+/- & VKK voltage OK? Replace DIG3E11.

When turn Check

NO NO
the volume, count is CN605 pin5, 6 Check FFC cable.
change? I2C data OK?

YES YES

FRONT, TOP board OK. Check MAIN board.

3-28
 ELECTRICAL TROUBLESHOOTING GUIDE
3. NO AUDIO CHECK

CD FUNCTION

Can NO NO Is Motor_open/ close OK?

LOAD +, - OK?
disc insert? (IC400 pin6, 7)

YES
YES YES

Check IC501.

Is motor impedance NO
Check loading motor.
about 12 Ω?

Check IC400.

NO

NO OPU driving NO Focusing/

Disc reading OK? Tracking/ Sled signal
(Focusing & Tracking) OK? OK?

YES YES

Check OPU. NO MON_MPD(CN400 pin22)

(Pick-up module) About 180 mV?

NO IC401 NO Check FFC cable

IC401 pin34, 35, 36 RF & Servo signal
I2S output signal OK? OK? to CN400, CN401.

YES YES

IC501 pin N1, N2, N4 NO

I2S input signal OK? Check IC501.

YES

3-29
 ELECTRICAL TROUBLESHOOTING GUIDE

USB play

When insert USB, NO ICA201 NO

IC501 pin U7, U8, A7, A8 USB Power +5 VU Replace ICA201.
USB_D signal OK? OK?

YES YES

AUX

IC201 NO
pin23, 24 AUX input signal Check audio cable.
OK?

YES

IC201 NO
pin42, 43, 44 I2S input signal Check IC501.
OK?

YES

IC201 NO
pin41 ADC/MIC_data output Replace IC201.
signal OK?

YES

3-30
 ELECTRICAL TROUBLESHOOTING GUIDE

POT. IN

IC201 NO
pin9, 10 POT. IN input signal Check FRONT board.
OK?

YES

IC201 NO
pin42, 43, 44 I2S input signal Check IC501.
OK?

YES

IC201 pin41 NO
ADC/MIC_data output signal Replace IC201.
OK?

YES

TUNER

IC201 pin26, 27 NO TU500 NO

TUNER_L/R input signal TUNER_L/R output Check +3.3 V of TU500.
OK? signal OK?

YES YES

IC201 NO
pin42, 43, 44 I2S input Check IC501.
signal OK?

YES

IC201 NO
pin41 ADC data output Replace IC201.
signal OK?

YES

3-31
 ELECTRICAL TROUBLESHOOTING GUIDE

YES

IC501 NO
pinD1, D2, E1 I2S Clock signal Check IC501.
OK?

YES

IC501 NO
pinE2 I2S data signal Check IC501.
OK?

YES

IC202 NO
PWM data output signal Replace IC202.
OK?

YES

3-32
 ELECTRICAL TROUBLESHOOTING GUIDE

NO NO pin45~48 of IC202,
pin49, 50 of IC202,
FRONT signal OK? MID or SW signal OK?

YES YES
Check IC202. Check IC202.

NO NO IC204, IC205
IC204 FRONT MID or SW
audio signal OK? audio signal OK?

YES YES
Check IC204. Check IC204, IC205.

pin13 of IC700 NO NO pin13 of

FRONT audio signal OK? IC701, IC705 MID or SW
audio signal OK?

YES YES
Check IC700. Check IC701, IC705.

NO NO
±66 V, -B+12 V, ±5 V ±66 V, -B+12 V, ±5 V
Power voltage OK? Power voltage OK?

YES YES
Check SMPS. Check SMPS.

NO NO Q707, Q708,
Q705,Q706
OK? Q717, Q718 OK?

YES YES
Check Q705, Q706. Check Q707, Q708, Q717, Q718.

Check speaker cable connection.

OK

3-33
 ELECTRICAL TROUBLESHOOTING GUIDE
4. NO LIGHTING (SPEAKER LED)

Power on

Push the “LIGHTING” button.

YES

Trun on the LED?

NO

Check Q616~Q618 NO
Replace Q616~Q618.
LED_5 V.

YES

IC601 LED 5 V NO
Check IC601.
OK?

YES

Check speaker.

3-34
 WAVEFORMS OF MAJOR CHECK POINT
1. DSP (IC501)

XI XI
1 3

XO XO
4
2

Fig 1-1. Crystal of RTC 32.768 kHz Fig 1-2. Crystal of system 24 MHz
(Both ends of R5D6) X501 (Main DSP : R508, C503) X500

2
1

MBER

3-35
2. PWM (IC202)

5 XI 7

6
XO 9

Fig 2-1. Crystal 24.576 MHz Fig 2-2. DSP to PWM I2S
(IC202 pin4, 5) X200 IC202 pin26~30

7 8

6 5

3-36
3. SERVO (IC401)

XI

10

12
XO

11

Fig 3-1. Crystal 16.9344 MHz Fig 3-2. CD-16M

(X400) (IC401 pin31)

11

10

12

3-37
4. MOTOR DRIVER (IC400)

17
13
14 18

15
16

Fig 4-1. LO- & LO+ / MOT_OPEN & MOT_CLOSE Fig 4-2. SL- & SL+ for Driving SPINDLE Motor
for Driving TRAY Motor (IC400 pin11, 12)
(IC400 pin6, 7, 9, 10)

19

20

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

(IC400 pin17, 18)

14 16

13 15 17 18
20
19

3-38
5. ADC (IC201) 6. USB (CN502)

21

22
24
23
25

Fig 5. ADC I2S Fig 6. USB D+/ D-

(IC201 pin42, 43, 44) (CN502 pin5, 6, 8, 9)

22 21
23

25 24

3-39
7. BLUETOOTH (CN504)

26 B T_TXBT_TX
BT_TX

27 BT_RX
BT_RX

BT_RST
28
BT_RST

Fig 7. BT_TX / BT_RX / BT_RST

(CN504 pin4, 6, 9)

26
27
28

3-40
WIRING DIAGRAM

AUX SPK SPK SPK

Tuner
IN/OUT LED Front Woofer
IC604 IC603
DRV632 IC206
ADC EXPENDER
PCM1808 BU2090F
IC602
IC201 DAC IC503 Q705/Q706 Q707/Q708 Q717/Q718
ADC PCM5101 F/S 16M IRF6775M IRF6775M IRF6775M
CS5346 IC501
IC401 W25Q128
IC400 MLC3730
RF IC IC700 IC701 IC705
Motor DR BU9546 GATE DRIVE GATE DRIVE GATE DRIVE
AM5890 IRS2092 IRS2092 IRS2092
IC502
6pin 23pin 10pin SDRAM
VFD Board W9825G IC204 IC205
SMPS
S4308 S4308

IC202
15pin 15pin
23pin 10pin MAIN Board PWM
PS9860
10pin
6pin 6pin
IC101
MICOM
MD R5F100G
10pin

10pin 10pin 33pin

USB2 USB1

Harness
10pin BT FFC
module
Top Board
IC2604
12pin 12pin 6pin MIC AMP 33pin
DRV632 MIC
MIC PTB MIC
10pin 10pin Front Board VOL

3-41 3-42
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM

2.0 1.1

USB1 USB2
SCRATCH A/B,
CD_RST
M_VOL_A/B, DAC AUX OUT
(VCC50) A,B,C,D,E,F,PD SERVO DRV632
FAN_CTRL /2, PCM5101
BU9546 DJ Effect Scratch/Level
LD
P/UP (x4)
SPDO/SLDO CD_RW/ MCLK/ LRCK/ BCK,

BT_TX/RX

BT_PCM_BUFFER
D1+/-
/FOD/TRD CD_DAT
AUX IN

MCS_BCK/LRCK, MCLK
D2S+/ -
AM5890 MOT_MUTE,CLOSE,OPEN
M LOAD±,SLED±, Motor Drive

AUX_DATA
SPIN±,TR±,F±
IC101
Micom IC201
DECK
OP_SW,CL_SW,UP_SW,DN_SW,D_SENSE ADC
MECHANISM TUNER
CS5346
(FM/AM)
DRM_WEN/CAS/
RAS/SEL/CLK/CKE (+3.3V_CD, VCC1.2) UART_RX/TX
32 MB(256 Mb)
M00_15 PTB
SDRAM A00_16 ADC_DATA
MLC3730
Main DSP For AUX MCS_BCK/LRCK/MCLK
16 MB(128 Mb) SF_DI/DO
S/Flash SF_CS/SCK
PGPC08

For MIC
PRE, AMP MIC 1
1 MB(8 Mb) PCM1808
S/Flash SF_DI/DO
DRV632 MIC 2
SF2_CS/SCK

PWM_LRCK/BCK/DATA
(± 5 V ) (± 66.5 V )

DSP_O_DATA
IR_IN_FL DRIVER FET
AMP_OSC OP AMP FRONT(SE)
IRS2092 IRF6775 500 W
AZ4580
FL_OUT_P/N X2

(+ 3.3 VA ,+ 12 V )
PS9860
SW1_OUT_P/N IR_IN_SW DRIVER FET SW(SE)
PWM OP AMP
IRS2092 IRF6775 500 W
FRONT AZ4580
VFD_STB/CLK/DO/RST, X2
SW2_OUT_P/N
VKK,FL+/ -
EXP_DATA

IR
RMC
Receiver
IR_IN_SW DRIVER FET SW(BTL) 1000 W
OP AMP
IRS2092 IRF6775
AZ4580
VFD X2

DIG311 MAIN VOL_A/B ,

KEY 1/2
Volume/ [OM7550 : Total 1000 W] [OM9550 : Total 1500 W]
Woofer Speaker MID : 500 W X 1 CH WOOFER : 1000 W X 1 CH
Key/switch Lighting FRONT : 500 W X 1 CH FRONT : 500 W X 1 CH

3-43 3-44
2. POWER BLOCK DIAGRAM
VKK 25mA
SMPS
FL± 370mA VFD
IC201 IC206
505mA PICK
IC600 ADC ADC
505mA DVCC_5V UP
+14AV DC_DC CS5346 PCM1808
TPS54331
20mA 10mA 80mA
1000mA IC312
IC602 IC401 IC202 IC101 IC603
LDO 5VU 1A IC604 TU500
DAC RF IC PWM MICOM EXPENDER DRV632
A278R05 TUNER
1802mA PCM5101 BU9546 PS9860 R5F100G BU2090F
374mA 10mA
IC505
+5.6VA DC_DC 77mA 10mA 80mA 22mA 10mA 25mA 70mA MCS_3.3V
DVCC_3.3V 80mA
TJ4200 20mA IC501
IC500 1.2VA 160mA MLC3730
160mA
DC_DC MCS_RTC_3.0A
TPS563200
OPTION
90mA
IC507 3.3VA IC504 IC503 IC502 IC102 IC508
F/S 1Mb BT RC311 IC311
LDO F/S 16M SDRAM RESET IC LDO
W25Q80 Module RMC VFD
AZ1117 W25Q128 W9825G AZ7027 AZ117
IC103
2mA
P_SENSE
2mA 20mA 15mA 38mA 6mA 2mA 5mA

100mA IC601 LED_5V 100mA 3 Color ICA301

LDO
LED*1EA MIC AMP FAN
LM37102 IC400
DRV632
Motor DR
2mA 230mA AM5890
582mA 350mA
IC402 9V
582mA OM9550 ONLY
+12V DC_DC 5V_AMP
TPS54328 IC207 20mA 20mA 20mA 6mA 6mA
78mA LM37102
78mA IC700 IC701 IC705 IC204 IC205
78mA GATE DRIVE GATE DRIVE GATE DRIVE
-5V S4580 S4580
IRS2092 IRS2092 IRS2092
Q705/Q706 Q707/Q708 Q717/Q718
IRF6775M IRF6775M IRF6775M 25mA 20mA 25mA 20mA 25mA 20mA 6mA 6mA
50mA
-B+12V

± 66.5V

3-45 3-46
 IMPORTANT SAFETY NOTE :

WHEN SERVICING THIS CHASSIS, UNDER NO SCHEMATIC FOR EASY IDENTIFICATION. THIS 1. Shaded( ) parts are critical for safety. Replace only
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER with specified part number.

CIRCUIT DIAGRAMS BE MODIFIED OR ALTERED WITHOUT PERMISSION

FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES
FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
2. Voltages are DC-measured with a digital voltmeter
during Play mode.

1. SMPS_POWER #1 CIRCUIT DIAGRAM IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.

SPECIAL COMPONENTS ARE SHADED ON THE
THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.

No Power
Q901 ~ Q904 are Defective
12

No Power
11
BD901 is Defective

10

No Power
F901 is Defective

CAUTION: Warning
Danger if fuse is incorrectly replaced.
1 Parts that are shaded are critical with
Replace only with the type identical to fuse rating respect to risk of fire or electrical shock.
and(or) model name described in main label. POWER_1
EAX66475001-SD(#01)_Rev1.1_1
2015. 04. 14
A B C D E F G H I J K L M N O P Q R S T

3-47 3-48
 IMPORTANT SAFETY NOTE :

WHEN SERVICING THIS CHASSIS, UNDER NO SCHEMATIC FOR EASY IDENTIFICATION. THIS 1. Shaded( ) parts are critical for safety. Replace only
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER with specified part number.
BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter
FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode.
SHOULD BE REPLACED ONLY WITH TYPES PERFORMANCE IMPROVEMENT CHANGES INTO
2. SMPS_POWER #2 CIRCUIT DIAGRAM IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
SPECIAL COMPONENTS ARE SHADED ON THE
THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.

12

11

10

No AMP Power
7 F911 is Defective

No AMP Power
6
Q905, Q906 are Defective

CAUTION:
Danger if fuse is incorrectly replaced.
Replace only with the type identical to fuse rating
and(or) model name described in main label.
5

Warning
1 Parts that are shaded are critical with
respect to risk of fire or electrical shock. POWER_2
EAX66475001-SD(#02)_Rev1.1_1
2015. 04. 14
A B C D E F G H I J K L M N O P Q R S T

3-49 3-50
3. MAIN_CD DSP CIRCUIT DIAGRAM

12

11

26
10
27
28

4
4

2
1
2

25 24
MAIN_CD DSP
1
: WAVEFORM NUMBER EAX66487701-SD(#01)_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-51 3-52
4. MAIN_ADC/PWM CIRCUIT DIAGRAM

12

11

10

8
9

7 8

6 5
6

22 21
23
5

MAIN_ADC/PWM
1
: WAVEFORM NUMBER EAX66487701-SD(#02)_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-53 3-54
5. MAIN_RF SERVO CIRCUIT DIAGRAM

12

11

11
10

10

12
5

14 16
3

13 15 17 18
2 20
19

MAIN_RF SERVO
1
: WAVEFORM NUMBER EAX66487701-SD(#03)_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-55 3-56
6. MAIN_AMP CIRCUIT DIAGRAM

12

11

10

MAIN_AMP
1
EAX66487701-SD(#04)_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-57 3-58
7. MAIN_AUX OUT/ VFD PWR CIRCUIT DIAGRAM

12

11

10

MAIN_AUX OUT/ VFD

1
EAX66487701-SD(#05)_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-59 3-60
8. FRONT CIRCUIT DIAGRAM

12

11

10

FRONT
1
EAX66449901-SD_Rev1.4_7
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-61 3-62
9. VFD/RMC1 CIRCUIT DIAGRAM

12

11

10

VFD/RMC1
1
EAX66468901-SD_Rev1.5_12
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-63 3-64
10. TOP CIRCUIT DIAGRAM

12

11

10

TOP
1
EAX66450001-SD_Rev1.5_8
2015. 07. 29
A B C D E F G H I J K L M N O P Q R S T

3-65 3-66
CIRCUIT VOLTAGE CHART
1. ICs 2. CAPACITORS
Specification Ratied -20% Ratied +20% Rated-20%(88V, 60Hz) Rated+20%(288V, 60Hz)
Parts Name Location No. Capacity Specification
Voltage (V) Voltage (V) Voltage (V) Voltage (V) Voltage (V)
IC101 C209 4.7u 50V 2.02 2.02
R5F100GEAFB VDD:-0.5~6.5V VDD : 3.31V VDD : 3.31V
MICOM
C226 100u 16V 11.31 11.32
IC102 Vcc : 3.37V Vcc : 3.37V
AZ7027RTRE1 VCC: Max 18V C231 100u 16V 5.00 5.00
Voltage Detector Vout : 3.36V Vout : 3.36V
C238 220u 16V 3.30 3.30
IC103 Vcc : 3.37V Vcc : 3.37V
AZ7027RTRE1 VCC: Max 18V C240 220u 6.3V 1.26 1.26
Voltage Detector Vout : 3.36V Vout : 3.36V
VA : 4.75~5.25V VA : 5.01V VA : 5.01V C308 47u 16V 5.21 5.21
IC201 VD : 3.13~3.47V VD : 3.32V VD : 3.32V C344 47u 16V 5.01 5.01
CS5346
A/D Converter VLS : 3.13~5.25V VLS : 3.32V VLS : 3.32V
VLC : 3.13~5.25V VLC : 3.32V VLC : 3.32V C345 47u 16V 5.64 5.64

AVDD, AVDD, C347 470u 10V 3.37 3.38

AVDD, AVDD_PWM,
IC202 AVDD_PWM, AVDD_PWM, C402 100u 16V 5.00 5.00
PS9860 DVDD_CORE
PWM DVDD_CORE DVDD_CORE
: 0~3.6V C404 47u 16V 3.32 3.32
: 3.23V : 3.23V
IC203~5,IC802 C409 47u 16V 3.32 3.32
AZ4580MTR-E1 VCC: ~20V VCC: 5.02V VCC: 5.02V
OP Amplifier C416 47u 16V 1.66 1.66
IC206 VCC : -0.3~6.5V VCC : 5.00V VCC : 5.00V C418 3.3u 50V 0.52 0.51
PCM1808
A/D Converter VDD : -0.3~4V VDD : 3.32V VDD : 3.32V
C427 220u 16V 8.73 8.73
IC207,IC601 Vin : 2.25~16V Vin : 5.63V Vin : 5.63V
LM37102D-ADJ C501 220u 10V 3.23 3.23
LDO Voltage Requlator Vout : 1.25~15V Vout : 5.20V Vout : 5.20V
C5C9 1000u 6.3V 3.35 3.36
IC400
AM5890 VCC : 4.3~13.2V VCC : 8.74V VCC : 8.74V
Motor Driver C5E1 47u 16V 3.36 3.35
DVDD,AVDD : 2.7~3.6V C604 47u 16V 5.12 5.12
IC401 DVDD,AVDD : 3.26V DVDD,AVDD : 3.25V
BU9546KV VDD_CORE : C622 470u 16V 2.77 2.77
RF, Servo VDD_CORE : 1.85V VDD_CORE : 1.85V
1.75~1.95V
C627 47u 50V 27.04 27.09
IC402 VIN : -0.3~20V VIN: 11.83V VIN: 11.83V
TPS54331D C707 1000u 80V 65.84 65.84
DC/DC Converter VRGE : -0.5~6.5V VOUT: 5.50V VOUT: 5.50V
IC501 VDD12 : 1.08~1.32V VDD12 : 1.2V VDD12 : 1.2V C728 1000u 80V 65.56 65.58
MLC3730S
DSP VDD33 : 3.0~3.6V VDD33 : 3.36V VDD33 : 3.36V C752 2200u 80V 65.98 65.98
IC502 C798 2200u 16V 66.08 66.08
W9825G6KH-6 256MBIT VDD,VDDQ : 3.0~3.6V VDD,VDDQ : 3.36V VDD,VDDQ : 3.36V
SDRAM
C904 330u 450V 394.50 394.50
IC503 W25Q128FVSIG
Vcc : 2.7~3.6V Vcc : 3.37V Vcc : 3.37V C926 47u 50V 15.72 15.74
Serial Flash Memory 128MBIT
IC504 C927 47u 50V 17.10 17.20
W25Q80DVSSIG 8MBIT Vcc : 2.7~3.6V Vcc : 3.37V Vcc : 3.37V
Serial Flash Memory C936 1000u 16V 5.65 5.65
IC505 Vin : 2.5~6.5V Vin : 4.90V Vin : 4.91V C937 2200u 16V 5.66 5.66
TJ4220GDP-ADJ
LDO Voltage Requlator Vout : 2.5~5V Vout : 3.33 V Vout : 3.33 V
C944 470u 25V 12.64 12.70
IC507,IC508 Vin : Max 12V Vin : 5.12V Vin : 5.12V
AZ1117BH-ADJTRE1 C948 220u 25V 7.00 6.92
Voltage Regulator Vout : Max 10V Vout : 3.36V Vout : 3.36V
IC600 C958 100u 16V 11.83 11.84
TPS54331D VIN : 3.5~28V VIN: 12.67V VIN: 12.67V
DC/DC Converter C963 1000u 25V 16.17 16.18
IC602 CPVDD/AVDD/DVDD : CPVDD/AVDD/DVDD : CPVDD/AVDD/DVDD : C964 220u 25V 11.81 12.02
PCM5101APWR
D/A Converter 3.0~3.6V 3.32V 3.32V
C966 1000u 80V 66.10 66.07
IC603
BU2090 Vin : 2.7~5.5V Vin : 3.37V Vin : 3.37V C968 1000u 80V 65.58 65.84
Clock Driver
IC700~IC705 VB : 0~220V VB : 11.32V VB : 11.33V
IRS2092
Power Driver VAA : MAX 210V VAA : 5.12V VAA : 5.12V
ICA301
DRV632 VCC: -0.3~4.0V VCC:3.32V VCC:3.32V
PRE Amplifier

3-67 3-68
3. CONNECTORS 4. ZENER DIODES
Input Output Location No. Voltage
Pin No. Pin Name Spec [%] Range [%] Margin [%] Margin [%]
Voltage Voltage
ZD901 33V
SMPS <-> MAIN CN901 (SMPS) CN106 (MAIN)
ZD902 (TVS) 13V
5 -5V -5 ±10% -4.98 -0.4% -4.96 -0.8%
ZD904, ZD905, ZD906, ZD907, ZD909, ZD911 16V
7,8 +5.6V 5.6 ±10% 5.63 0.5% 5.64 0.7%
ZD908 22V
11 14VA 14 ±10% 12.86 -8.1% 12.68 -9.4%
ZD915 10V
12 12V 12 ±10% 11.91 -0.7% 11.84 -1.3%
ZD920,ZD921 27V
14 -B (-PVDD) -66 ±10% -66 0.0% -66.1 0.2%
15 GATE -54 ±10% -54.11 0.2% -54.13 0.2%
SMPS <-> MAIN CN902 (SMPS) CN110 (MAIN)
1,2 +B (+PVDD) 66 ±10% 65.81 -0.3% 65.81 -0.3%
5,6 -B (-PVDD) -66 ±10% -66.08 0.1% -66.08 0.1%
FRONT <-> MAIN CNA305 (FRONT) CN605(MAIN)
7 FL- -25 ±10% -24.46 -2.2% -24.46 -2.2%
14 VKK -27 ±10% -26.99 -0.0% -26.99 -0.0%
15 FL+ -22 ±10% -22.22 1.0% -22.22 1.0%
16 3.3V 3.3 ±10% 3.37 2.1% 3.35 1.5%
MAIN <-> TOP(USB) CN502 (MAIN) CNA203(TOP)
2,3 5.6VA 5.6 ±10% 5.64 0.7% 5.64 0.7%
MAIN <-> BT Module CN504 (MAIN) BT Module
10 3.3VA 3.3 ±10% 3.329 0.9% 3.329 0.9%
MAIN <-> Pick-up(MD) CN400(MAIN) MD
8 DVCC_5V 5 ±10% 5.01 0.2% 5.01 0.2%
MAIN <-> FAN Module CN604 (MAIN) FAN Module
4 12V 12 ±10% 11.98 -0.2% 11.98 -0.2%
FRONT <-> MAIN CNA304 (FRONT) CN201(MAIN)
6 3.3V 3.3 ±10% 3.244 -1.7% 3.244 -1.7%
TOP <-> VFD CNA206 (TOP) CN3E14(VFD)
1 VKK -27 ±10% -26.98 -0.1% -26.98 -0.1%
2 FL+ -22 ±10% -22.21 1.0% -22.21 1.0%
3 FL- -25 ±10% -24.45 -2.2% -24.45 -2.2%
10 3.3VA 3.3 ±10% 3.245 -1.7% 3.245 -1.7%
FRONT <-> TOP CNA302 (FRONT) CNA204(TOP)
1 VKK -27 ±10% -26.98 -0.1% -26.98 -0.1%
2 FL+ -22 ±10% -22.21 1.0% -22.21 1.0%
3 FL- -25 ±10% -24.45 -2.2% -24.45 -2.2%
10 3.3VA 3.3 ±10% 3.245 -1.7% 3.245 -1.7%
FRONT <-> TOP CNA303 (FRONT) CNA205(TOP)
9 KEY2 3.3 ±10% 3.253 -1.4% 3.253 -1.4%
11 KEY3 3.3 ±10% 3.253 -1.4% 3.253 -1.4%
12 KEY1 3.3 ±10% 3.253 -1.4% 3.253 -1.4%

3-69 3-70
PRINTED CIRCUIT BOARD DIAGRAMS
1. SMPS P. C. BOARD (TOP VIEW)
NOTE) Warning
Parts that are critical with respect to risk
of fire or electrical shock.

3-71 3-72
2. SMPS P. C. BOARD (BOTTOM VIEW)
NOTE) Warning
Parts that are critical with respect to risk
of fire or electrical shock.

3-73 3-74
3. MAIN, VFD/RMC1 P.C.BOARD (TOP VIEW)

3-75 3-76
4. MAIN, VFD/RMC1 P.C.BOARD (BOTTOM VIEW)

3-77 3-78
5. FRONT P.C.BOARD (TOP VIEW)

6. FRONT P.C.BOARD (BOTTOM VIEW)

3-79 3-80
7. TOP(VOLUME_FR1) P.C.BOARD (TOP VIEW)

3-81 3-82
8. TOP(VOLUME_FR1) P.C.BOARD (BOTTOM VIEW)

3-83 3-84
 APPENDIX
MECHANISM (DM19AA)

CONTENTS
DECK MECHANISM DISASSEMBLY
1. Cover Top ...................................................................................................................................................2
2. Clamp Assembly .........................................................................................................................................2
2-1. Plate .....................................................................................................................................................2
2-2. Magnet .................................................................................................................................................2
2-3. Clamp...................................................................................................................................................2
3. Tray Disc .....................................................................................................................................................3
4. Pick Up Assembly .......................................................................................................................................4
5. Base Up/Down ............................................................................................................................................4
6. Belt Loading ................................................................................................................................................5
7. Gear Pulley .................................................................................................................................................5
8. Gear Loading ..............................................................................................................................................5
9. Guide ...........................................................................................................................................................5
10. Deck PCB Assembly ...................................................................................................................................5
11. Motor Assembly ..........................................................................................................................................5
12. FFC Cable ...................................................................................................................................................5

DECK MECHANISM EXPLODED VIEW (DM19AA).............................................................................................6

1
 DECK MECHANISM DISASSEMBLY

(S1)
1
Cover Top

Clamp
Assembly

2
3

Clamp Assembly

Plate

Magnet

2 Clamp

(L1)

< Figure A > < Figure B >

1. Cover Top 2. Clamp Assembly

1) Remove the 2 screws (S1). 1) Place the Clamp Assembly as Figure B.
2) Unhook the 4 Locking Tabs (L1) by using a 2) Bending the Cover Top in direction of
flat-head screwdriver. arrow (2) as Figure B.
3) Remove the Cover Top. 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.

2
 DECK MECHANISM DISASSEMBLY

Emergency eject hole

MD Sub
(H1) Assembly

1
Tray Disc

1 2 2 1

< Bottom side view >

3
Tray Disc
< Figure D >

2 Tray Disc
3) Grasp the both sides of the Tray Disc and lift
it up as Figure D, and then pull the Tray Disc
< Figure C > until it is separated from the MD Sub Assembly
completely.
3. Tray Disc
1) Insert and push a flat-head screwdriver in the
Guide
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.

Tray Disc

< Figure E >

Note
• When reassembling place the Guide as Figure E.

3
 DECK MECHANISM DISASSEMBLY

Gasket Tape
Base Up/Down

(D)
2
RE B
OR BR D LK
N N
Deck PCB (B)
Assembly
BK
RE
D
(L2) 3

1
2

(H2)
< Bottom side view >

(S2) Base Main

3
5 Figure G-3

(C)
(A) Guide
Rubber FFC Cable
Damper Pick Up
4 Assembly (B)
Base
Up/Down
Figure G-1 Figure G-2

< Figure G >

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

Note
4. Pick Up Assembly
• When reassembling move the Guide in direction
1) Detach the Gasket Tape. of arrow (A) until it is positioned as Figure G-1.
2) Disconnect the wires (BLK, RED, BRN, ORN) • When reassembling insert the (B) portion of the
from the Deck PCB Assembly by desoldering. Base Up/Down in the (C) portion of the Guide as
3) Remove the 4 screws (S2). Figure G-2.
4) Disconnect the FFC Cable from the Pick Up • When reassembling insert the (D) portion of the
Assembly. Base Up/Down in the Hole (H2) of the Base Main
as Figure G-3.
5) Remove the 4 Rubber Dampers.

4
 DECK MECHANISM DISASSEMBLY

Base Main

(A)
Figure H-1

Guide
(B)

Gear Loading

Gear Pulley

(L3)

Base Main

< Bottom side view >

Belt Loading
(L4)
RE B
OR BR D LK
N N

RE
BK D

Deck PCB
< Bottom side view > Motor < Bottom side view > Assembly
Assembly
Deck PCB
(S3) Assembly

< Figure H >

6. Belt Loading 10. Deck PCB Assembly

Remove the Belt Loading. 1) Disconnect the wires (RED, BK) form the
Deck PCB Assembly by desoldering.
7. Gear Pulley
2) Remove the 1 screw (S3).
Unlock the Locking Tab (L3) in direction of arrow
and then separate the Gear Pulley from the Base 3) Separate the Deck PCB Assembly from the
Main. Base Main.

8. Gear Loading 11. Motor Assembly

Remove the Gear Loading. Unlock the Locking Tab (L4) in direction of
arrow and then separate the Motor Assembly
9. Guide from the Base Main.
1) Move the Guide in direction of arrow (A) as 12. FFC Cable
Figure H-1.
2) Separate the Guide from the Base Main. Remove the FFC Cable.

5
 DECK MECHANISM EXPLODED VIEW (DM19AA)

1439

1002
A001

1006

1005 1001
1026 1003 1004

1030
1024
1437

1437

1024 1024
1012
1049
1437
1013 1016 1015 1024

1020

1011

A006

1019 1043

1018 A005
1045
1439