LG CM9540 Schematic

Mini Hi-Fi System

SERVICE MANUAL

MODEL:

CM9540

(CM9540, CMS9540F/W)

CAUTION

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

MODEL: CM9540 (CM9540, CMS9540F/W)SERVICE MANUAL

4102 ,MARCH76592129NFA : ON/P

Website http://biz.lgservice.com

Internal Use Only

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ REPLACEMENT PARTS LIST

1-1

SECTION 1

SUMMARY

CONTENTS

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

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

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

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

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

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

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 MΩ)

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 MΩ)

Resistor
(1 MΩ)

Conductive
Sheet

1-4

ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can

generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.

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

SAFETY PRECAUTIONS.

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

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.

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

1-5

HIDDEN KEY MODE

Push both 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

FLD “NO DISC” status

It is possible at any function.
(ex. It is possible at FLD “NO USB” status, too.)
This is an example.

Remote control ‘ ’ + Front ‘STOP’
push same timing during 5 seconds.

FLD “op0-…..”

Move to appropriate position and

make changes with remote control.

( , , /■ , REPEAT )

Press STOP key

FLD “WRITE OK”

DETECT NEW EEPROM
(OPTION EDIT SCREEN)

NAME

OP0
OP1
OP2
OP3
OP4
OP5
OP6
OP7
OP8
OP9

HEX

05
00
00
00
00
01
81
46
00
01

Remote control ‘ ’ +

Front ‘STOP’ push same timing.

FLD “e2p clr”

Completed

1-7

PROGRAM DOWNLOAD & UPDATE GUIDE

1. AUDIO PROGRAM

Download program file name must be MICOM_CM9540_YYMMDDX.HEX

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and

disable the security software, then download the file to your set. Downloading file proceeds in the same way at
USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

MICOM UP

↓

FINISH

↓

Auto POWER OFF

1-8

2. CD PROGRAM

Download program file name must be HG480_CM9540_YYMMDDX.bin

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and

disable the security software, then download the file to your set. Downloading file proceeds in the same way at
USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

MCS UP

↓

SMJ UP

↓

FINISH

↓

Auto POWER OFF

1-9

3. DEMO PROGRAM

Download program file name must be DEMO_DAT.bin

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and

disable the security software, then download the file to your set. Downloading file proceeds in the same way at
USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

DEMO UP

↓

FINISH

↓

Auto POWER OFF

1-10

4. EQ PROGRAM

Download program file name must be EQ_PRG.BIN

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and

disable the security software, then download the file to your set. Downloading file proceeds in the same way at
USB1 function and USB2 function.

Caution: When downloading the file, you should neither unplug the USB device, change to the other function,

nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

EQ UP

↓

FINISH

↓

Auto POWER OFF

1-11

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label.
Power consumption Refer to the main label.
Dimensions (W x H x D) (290 x 349 x 370) mm
Net Weight (Approx.) 5.9 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 60 %
Bus Power Supply 5 V 500 mA

• INPUTS

AUX IN 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)
PORT. IN 1.2 Vrms (3.5 mm stereo jack)
MIC 20 mV

• 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

• CD

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

• AMPLIFIER

Stereo mode 385 W x 2 (THD 20 %)
Surround mode
Front 385 W x 2 (THD 20 %)
Surround 385 W x 2 (THD 20 %)
Subwoofer 385 W x 2 (THD 20 %)

• FRONT SPEAKER

Type 2 Way 2 Speaker
Impedance 6 Ω
Rated Input Power 385 W
Max. Input power 770 W

• SURROUND SPEAKER

Type 1 Way 1 speaker
Impedance 6 Ω
Rated Input Power 385 W
Max. Input power 770 W
Net Dimensions (W x H x D) (425 x 505 x 351) mm
Net Weight 13.2 kg

• SUBWOOFER

Type 1 Way 1 speaker
Impedance 6 Ω
Rated Input Power 385 W
Max. Input power 770 W
Net Dimensions (W x H x D) (425 x 505 x 354) mm
Net Weight 12.7 kg

• Design and specifications are subject to change without notice.

1-12

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. CABINET AND MAIN FRAME SECTION (CM9540) ................................................................................ 2-3

2. MECHANISM DECK SECTION (DP17TM2) ............................................................................................ 2-5

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

4. SPEAKER SECTION ................................................................................................................................ 2-8

2-1

MEMO

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (CM9540)

M

B

A

H

G

D

E

F

MAIN

A

E

D

B

L

SMPS

M

266

A46

267

443

443

252

251

252

253

A42

A47

443

443

443

268

270

269

272

271

443

443

443

443

443

F

B/T

A52

CABLE4

A44

259

K

MIC & PTB

443

CABLE3

G

H

I

J

443

443

CABLE1

FRONT

CABLE2

I

J

K

291

NFC Tag

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.

A43

A56

L

300

2. MECHANISM DECK SECTION (DP17TM2)

1026

1439

A001

1002

1005

1001

1049

1437

1437

1024

1024

1030

1024

1043

1045

A005

A006

1016

1013

1015

1020

1024

1003

1439

1018

1019

1011

1012

1437

1004

3. PACKING ACCESSORY SECTION

801 Owner’s Manual

808 Battery

826 Filter, Ferrite Core

825 FM Wire Antenna

900 Remote Control

803 Packing

804 Bag

803 Packing

802 Box

4. SPEAKER SECTION

4-1. FRONT SPEAKER (CMS9540F)

• LEFT SPEAKER

A60L

A61

A62

LED

SUB

LED

MAIN

652

651

FRONT SPEAKER (CMS9540F)

• RIGHT SPEAKER

A60R

A61

A62

LED

SUB

LED

MAIN

652

651

4-2. SUBWOOFER SPEAKER (CMS9540W)

A90

951

A91

952

LED
SUB

LED

MAIN

A92

836A Rubber Foot (Rear)

952

836L Rubber Foot (Left)

836R Rubber Foot (Right)

SECTION 3

ELECTRICAL

CONTENTS

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

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

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

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

4. NO BOOTING IN CD/USB FUNCTION .................................................................................................. 3-6

5. NO OPERATION OF MD (DRIVING THE SERVO MOTORS) ............................................................ 3-11

6. NO SOUND .......................................................................................................................................... 3-16

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT ........................................................................ 3-22

8. NO POWER ON (STANDBY LED IS BLINKING) ................................................................................ 3-23

9. SPEAKER NO AUDIO .......................................................................................................................... 3-24

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

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

2. SYSTEM PART .................................................................................................................................... 3-29

3. NO AUDIO PART ................................................................................................................................. 3-30

4. NO LIGHTING (WOOFER SPEAKER) ................................................................................................. 3-35

WAVEFORMS OF MAJOR CHECK POINT ................................................................................................... 3-36

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

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

1. SMPS BLOCK DIAGRAM..................................................................................................................... 3-43

2. MAIN SYSTEM BLOCK DIAGRAM ...................................................................................................... 3-45

3. MAIN POWER BLOCK DIAGRAM ....................................................................................................... 3-47

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-49

1. SMPS - POWER #1 CIRCUIT DIAGRAM ............................................................................................ 3-49

2. SMPS - POWER #2 CIRCUIT DIAGRAM ............................................................................................ 3-51

3. MAIN - CD DSP CIRCUIT DIAGRAM .................................................................................................. 3-53

4. MAIN - RF / SERVO CIRCUIT DIAGRAM ........................................................................................... 3-55

5. MAIN - ADC / PWM CIRCUIT DIAGRAM ............................................................................................ 3-57

6. MAIN - AMP CIRCUIT DIAGRAM ........................................................................................................ 3-59

7. FRONT VOLUME CIRCUIT DIAGRAM ................................................................................................ 3-61

8. MIC & PORTABLE CIRCUIT DIAGRAM .............................................................................................. 3-63

9. FRONT SPEAKER MAIN CIRCUIT DIAGRAM .................................................................................... 3-65

10. FRONT SPEAKER SUB CIRCUIT DIAGRAM ..................................................................................... 3-67

11. WOOFER SPEAKER MAIN CIRCUIT DIAGRAM ................................................................................ 3-69

12. WOOFER SPEAKER SUB CIRCUIT DIAGRAM .................................................................................. 3-71

CIRCUIT VOLTAGE CHART .......................................................................................................................... 3-73

1. CONNECTORS .................................................................................................................................... 3-73

2. CAPACITORS....................................................................................................................................... 3-74

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-75

1. SMPS P.C.BOARD ............................................................................................................................... 3-75

2. MAIN P.C.BOARD ................................................................................................................................ 3-79

3. FRONT VOLUME P.C.BOARD ............................................................................................................ 3-83

4. MIC & PORTABLE P.C.BOARD ........................................................................................................... 3-85

5. FRONT SPEAKER MAIN P.C.BOARD ................................................................................................ 3-85

6. FRONT SPEAKER SUB P.C.BOARD .................................................................................................. 3-85

7. WOOFER SPEAKER MAIN P.C.BOARD ............................................................................................. 3-87

8. WOOFER SPEAKER SUB P.C.BOARD .............................................................................................. 3-87

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 multi meter.

3) Check if the NTC thermistor TH900, TH901 is normal or open.

PN901

FH901

12

GP390-02P-TS

T12AH/250V
(12A 250V)

F901

12

TH900

FH902

FNR-14K681T

TH901

VR900

TH902

READY

R-PART:EBG61545701

5ohm

5ohm

1M

1M

1M

R904

!

R905

R906

1M

TP13 TP14

1M

1M

GND

R901

0.22uF/275V
CM903

R902

R903

0.33uF/275V

1000pF/250VAC

R9E1

1M

TP15

R9E2

1M

TP20TP12

TP16

R9E3

1M

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

!

CM901

2
8

9FL

m

R:EAE62524901

1000pF/250VAC

C903

C909

0

H

2

!

0.33uF/275V

R:EAE62524901

CM902

470pF/250VAC

C901

C902

NC

GND

J901

1

J902

1

J903

1

J904

1

2

LF901

!

2

2

2

6

C90

1uF

/550V

600V/10A

4

1

2

3

4

@Opti

2

BD901

D10XB60

1

25x15

HS906

3

< 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

< TH900, TH901 >
If TH900, TH901 is open,
replace it with a new one.

ONE POINT REPAIR GUIDE

3

R980

25deg >330ohm

NO POWER

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

1-2. NO 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 F901 is open or short-circuit.

2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q905, Q906 with a digital multi-meter.
 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)

PFC_TH

PFC_OUT
380V

C979

P.GND

102PF

22k VINS :285V

24k VINS :260V

FH912

12

F911

6.3A/250V

TP62

TP63

TP64

TP65

R9A6

R945

R944

R9A3

R942

R941

70deg->2.2kohm

12

MARK:G2

12

FH911

1M

1M

1M

1M

1M

1%

24K

TH912

BG

PFC_PTC_SMD

F

C932

C960 1u

C943

R951:24K=> 65KHZ
R951:20K=> 70KHZ

TH914

C978

P.GND

READY

22nF

102PF

ZD904

P.GND

C977

BZX84-C16

TP39

R927

12

10nF

R951

12

ON/OFF:11.3~12.7V

Ivcc:5.8mA

10nF

C933

IC902

2.7K

12K

TP42

TP43

6LG7HG8

VCC

ICE1HS01G-1

VCSL:0.8V
VCSH:1.63V

1

2

CS

FMIN

100nF

C942

3FB4

5

VINS

GND

Vab:5V
Vth:1.25V

ZD915

P.GND

C935

470nF

TP41

TP48

/50V

NC

R993

3.3

R992

3.3

P.GND

FBH:4.5V OVERLOAD

Fixed Blanking Time:20ms

10K

R950

TP38

10nF

C940

BZX84-C10

22nF

C939

R949

P.GND

D934

22

D935

SMFB14

SMFB14

HS905 H/S

HS904
50X15

2

3

2

4

C972

READY

P.GND

BC911

UBW2012-121F

READY

TH913

0

1G

10K

R990

GND

2D

READY

C992

3S

Q905

IPA60R190E6

!

T903

20

19

2

18

3

17

4

16

5

15

6

14

7

13

8

PC90

3

1

R986

TP46

100

R988

TP60

D932

ZD912

4.7
SMFB14

T902

CM9720 PULSE

7

10

W1

W3

W2

1

56

4

12

1G

Q906

10K

IPA60R190E6

D922

1SS355

75

D921

2D

3S

R9A7

150
1W

READY

C993

C934

0.039uF
1250V

C938

68PF

1KV/125C

C982

R9B7

100

D926

R9B8

TP61

4.7
SMFB14

R9B4

TP32

0OHM

BC915

TP47

UBW2012-121F

ZD917

READY

R9B9

P.GND

R9A8

R9C4

12

12

27T/8T:2T

230uH:65uH

!

11

< 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

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. MICOM (IC501)

2-1-1. Solution

Please check and replace IC501 on MAIN board.

2-1-2. 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.

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

\WX

rlX

O X]P

OZYU^]_ro¡P

< MAIN board top view >

\WW

OY[to¡P

w~yj{ys

Oy\m^P

3-4

ONE POINT REPAIR GUIDE

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

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

3-1. VFD (DIG300)

3-1-1. Solution

Please check and replace DIG300 on FRONT board.

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

1) Check if 39V, FL+ and FL-are output from SMPS to VFD via the main board.

2) Check if the IC101 outputs VFD_RST, VFD_CLK, VFD_STB, and VFD_STB to the front board.

3) Check if the VFD grid current amplifier circuit (Q301, Q303) on the front board.
Check the drive signal to the transistor’s base.

 If the control signals from VFD (DGND_2, VH, VDD) isn’t output, replace VFD with a new one.
 If the transistor doesn’t work, replace it.

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

kpnZWXG} mk

{w ZWYSG
{w ZWZSG

{wZW[

xZWX xZW[xZWZ

yZY^O{w ZW[P
xZWXGl  

j G G  SG G  GGG
GU

  GGGG U

G

ZW} T

< MAIN board top view >

3-5

ONE POINT REPAIR GUIDE

4. 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.

4-1. NO VCC33, VCC12

4-1-1. Solution

Please check and replace IC505, IC509 on MAIN board.

4-1-2. 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 pinB2 of IC501 & R524, R5F7.

3)

If PWR_CTRL is high, check R5F6, R5F4, R5F5 and if there’s no defective component then replace IC505.

4) If 3.3 V (VCC33) is normal, check 1.2 V output (pin2, 4) voltage of IC509.
 If 1.2 V of IC509 pin2, 4 doesn’t come out, then replace IC509.

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

IC505

D501

IC509

< MAIN board top view >

3-6

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.

4-2. CRYSTAL (X500)

4-2-1. Solution

Please check and replace X500 on MAIN board.

4-2-2. 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, R509, C502, C503 around crystal (X500).
 If there’s no defective component, then replace X500.

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

X500

< Signal check point >

p

v

IC500

< Signal waveform >

3-7

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.

4-3. SERIAL FLASH (IC503)

4-3-1. Solution

Please check and replace IC503 on MAIN board.

4-3-2. 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 (R564, R563, R535, R536, R534) 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).

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

VCC

IC503

CS#

CLK

DO

< Signal check point > < Signal waveform >

3-8

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.

4-4. SDRAM (IC502)

4-4-1. Solution

Please check and replace IC502 on MAIN board.

4-4-2. 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, R506, 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).

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

IC502

< Signal check point >

}jj

y





Vjz

yhz

V~l

jhz

< Signal waveform >

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.

4-5. DSP IC (IC501)

4-5-1. Solution

Please check and replace IC501(MLC3730) on MAIN board.

4-5-2. 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).

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

R546

R594
PGPB12
(Yellow)

IC501

y\`[
y\`_

y\`^GOiP

< Signal check point >

R598
PAD19
(Green)

R597
PAD20
(Pink)

< Signal waveform >

3-10

ONE POINT REPAIR GUIDE

5. NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-1. SPINDLE MOTOR

5-1-1. Solution

Please check and replace IC407, IC408 on MAIN board.

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

1) Check the SPDO signal from Pin16 of IC407.
 If no signal, check 3.3 V(RF) and X400.

2) Check the SP- & SP+ from IC408 to CN405 for driving SPINDLE motor. It is about 3.6 Vp-p.
 If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN405 and MD.

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

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

zwR

zwT

< Waveform of SP- & SP+

for driving SPINDLE motor >

zwT

_GGju[W\

zwR

w]GGju[W\

pj[W_

< Signal check point >

3-11

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-2. SLED MOTOR

5-2-1. Solution

Please check and replace IC407, IC408 on MAIN board.

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

1) Check the SLDO signal from Pin23 of IC407.
 If no signal, check 3.3 V(RF) and X400.

2) Check the SLED+ & SLED- from IC408 to CN405 for driving SPINDLE motor. It is about 2.9 Vp-p.
 If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN405 and MD.

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

5-2-3. Service hint (Any picture / Remark)

zsR

zsT

< Waveform of SLED- & SLED+

for driving SLED motor >

zsT

`GGju[W\

zsR

^GGju[W\

pj[W_G

< Signal check point >

3-12

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-3. TRAY OPEN / CLOSE MOTOR

5-3-1. Solution

Please check and replace IC407, IC408 on MAIN board.

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

1) Check MOT_OPEN & MOT_CLOSE signals from Pin K4 & L4 of IC501 to IC408.
 If no signal, check +1.8 V & + 5 V to IC408.

2) Check LOAD± from IC408 to CN405 for driving the tray open / close motor. It is about 3.85 Vp-p.
 If no signal, check +5 V to IC408. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN405 and MD.

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

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

svT

svROylkP

tv{ vw lu
tv{  jsvz l

< Waveform for driving TRAY

open/close motor >

svT

wGYGGGju[W\

< Signal check point >

svR

wG[GGju[W\

tv{vwlu

^GGpj[W_

pj[W_G

tv{jsvzl

]GGpj[W_

3-13

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-4. LASER TRACKING ACTUATOR

5-5-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-4-2. 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 Pin22 of IC407.
 If no signal, check 3.3 V(RF) and X400.

2) Check TR- & TR+ from IC408 to CN404 for driving the tracking actuator.
 If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN404 and MD.

4) Check the MD.
 If the pick-up 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.

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

{y T Gju[W[
{y RGGju[W[

< Waveform of TR±

for driving TRACKING actuator >

{yT

X^GGju[W[

< Signal check point >

{yR

X]GGju[W[

ju[W[

3-14

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-5. LASER FOCUSING ACTUATOR

5-5-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-5-2. 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 FOD signal from Pin21 of IC407.
 If no signal, check 3.3 V(RF) and X400.

2) Check F- & F+ from IC408 to CN404 for driving the focusing actuator.
 If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN404 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.

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

mRG Gju[W[

mT Gju[W[

< Waveform of F±

for driving FOCUSING actuator >

mT

X_GGju[W[

< Signal check point >

mR

X\GGju[W[

ju[W[

3-15

ONE POINT REPAIR GUIDE

6. NO SOUND

There is no sound output in the USB FUNCTION, repair the set according to the following
guide.

6-1. IN THE USB FUNCTION

6-1-1. Solution

Please check and replace IC501 on MAIN board & IC300 on USB board.

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

1) Check +5VU to USB board.

 If +5.6 VA to pin2 of IC300(LDO) doesn’t come out, check pin4, 5 of CN304.
 If +5.6 VA is normal & +5VU of IC300 pin3 doesn’t come out, then replace IC300.

2) Check if “Digital audio AMP block”.

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

kR

< USB function signal fl ow >

kT

< Waveform of USB D± signal >

USB D+ / D- (CN502 Pin1, 2 & 9, 10)

3-16

ONE POINT REPAIR GUIDE

NO SOUND

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

6-2. IN THE AUX FUNCTION

6-2-1. Solution

Please check and replace IC202 on MAIN board.

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

1) Check AUX_L/R signals to IC202 (Pin7, 8).

2) Check if MCS_BCLK, MCS_LRCLK, & MCS_MCLK are entered from IC501 to IC202.

3) Check if ADC/MIC_DATA is entered from IC202 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC202. 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.

6-2-3. Service hint (Any picture / Remark)

CS5346

MCS_MCLK

IC501

MLC3730

{T

IC202

AUX_ L/R

ADC/MIC_ DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

IC600

TAS5548

PWM

< AUX function signal fl ow >

AUX

IR A MP

IRS2092+ IRF6775

tjz tjsrGGyYYX

hkjVtpjkh{hGG GyYX\tjz ijrGGyYX]

tjz syjrGGy YX`

pjYWY

< Signal check point >

w{sGGYX

w{yGGYY

3-17

ONE POINT REPAIR GUIDE

NO SOUND

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

6-3. IN THE PORT. IN FUNCTION

6-3-1. Solution

Please check and replace IC202 on MAIN board.

6-3-2. How to troubleshoot (Countermeasure)

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

2) Check if PT_LR is entered pin 4 & 5 of CN3J01  pin 4 & 5 of CN3V02  Pin21 & 20 of CN3V01.

3) Check POT_L/R signals to IC202(pin21, 22).

4) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.

5) Check if ADC_DATA is entered from IC202 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC202. 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. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

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

IC600

PWM

POT . IN

IR A MP

IRS2092+ IRF6775

CS5346

MCS_MCLK

IC501

MLC3730

{T

IC202

POT_L/R

ADC/MIC_ DATA

MCS_LRCK

MIX_DATA_OUT

VOLUME

Board

MCS_BCK

TAS5548

< PORT. IN function signal fl ow >

tjz tjsrGGyYYX

hkjVtpjkh{hGG GyYX\tjz ijrGGyYX]

tjz syjrGGy YX`

pjYWY

< Signal check point >

w{sGGYX

w{yGGYY

3-18

ONE POINT REPAIR GUIDE

NO SOUND

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

6-4. IN THE TUNER FUNCTION

6-4-1. Solution

Please check and replace IC202, TU500 on MAIN board.

6-4-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_LR is entered from Pin1 & 3 of TU101 to IC202(Pin23, 24).

 If no signals, Check +3.3 V for Tuner power.
 Check if the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC101 to TU101.

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 IC202.

3) Check if ADC_DATA is entered from IC202 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC202. 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. Refer to “Digital Audio AMP” guide.
 If AMP is damaged, replace it with a new one.

6-4-3. Service hint (Any picture / Remark)

TUNER

IR A MP

IRS2092+ IRF6775

CS5346

MCS_MCLK

IC501

MLC3730

{T

IC202

TUNER _L/R

ADC/MIC_ DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

Jack

Board

IC600

TAS5548

PWM

< TUNER function signal fl ow >

hkjVtpjkh{hGG GyYX\tjz ijrGGyYX]

tjz tjsrGGyYYX

< Signal check point >

pjYWY

tjz syjr GGy YX`

{|ulyyG

GY[

{|ulysG

GYZ

3-19

ONE POINT REPAIR GUIDE

NO SOUND

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

6-5. IN THE MIC IN FUNCTION

6-5-1. Solution

Please check and replace IC508 on Main Board or ICM101 on MIC board.

6-5-2. How to troubleshoot (Countermeasure)

1) Check MIC_SIG signal to pin6 of CN506.
 If no signal, check the signal to pin6 of CN3M01 on the MIC board.
Check if the signal is entered from pin6 of CN3M01 to MAIN board.

2) Check if MIC_SIG is entered from pin6 of CN506 to pin3 to IC506 (MIC AMP).

3) Check if the amplified signal comes out from pin4 of IC506.
 If no signal output, check +12 V for IC506, replace IC506 with a new one if it has a problem.

4) Check if MIC_BCK, MIC_MLCK & MIC_LRCK is entered from IC501 to IC508.
Check if MIC_DATA is entered from pin9 of IC508 to pin7 of IC600.
 If no signal, check +5 V & +3.3 V for IC508. If it is abnormal, change replace it a new one.

6) Check the following I2S signal flow from IC508 to IC600.
 If there is any trouble, check the power for each IC. If the signals are abnormal, replace it 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.

6-5-3. Service hint (Any picture / Remark)

MIC IN

IR A MP

IRS2092+ IRF6775

AK5358

MCS_MCLK

IC508

IC501

MLC3730

MIG_SIG

ADC/MIC_ DATA

MCS_LRCK

MIX_DATA_OUT

IC506

S4308

MCS_BCK

Board

IC600

TAS5548

PWM

MIC

tpjz pnUGGXMYG

tpjpkh{hUGwpuG`

tpjsyjrUGwpuGXW

tpjtjsrUGwpuXX tp jijrUGw puGXY

< Signal check point >< MIC IN function signal fl ow >

3-20

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the BLUETOOTH FUNCTION, repair the set according to
the following guide.

6-6. IN THE BLUETOOTH FUNCTION

6-6-1. Solution

Please check and replace IC501 on MAIN board and Bluetooth module on front panel.

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

1) Check BT_RX, BT_TX signal to Pin5, 7 of CN504.


If no signal, check the signal to Pin5, 7 and Pin1(+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 Pin5, 7 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.

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

B/T Module

BT_RX,
BT_TX

IC501

MLC3730

TAS5548

MCS_BCK
MCS_LRCK

MIX_DATA_OUT

IR AM P

IRS2092+ IRF6775

IC600

PWM

< BLUETOOTH function signal fl ow >

i{  { UG   G^

ju\W[

i{j{ zUGGZ

i{y{zUGG[i{  y UG   G\

i{j{ zUGGX^Y

i{y{zUGGX^X

i{  { UG   GX^W

i{ y UG  GX]`

< Signal check point >

3-21

ONE POINT REPAIR GUIDE

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

Audio signal output is small or not. when you power on the Middle Power Mini
System.

7-1. IC700 ~ IC705

7-1-1. Solution

Please check and replace IC700 ~ IC705 on MAIN board.

7-1-2. 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 ~ IC705 on your eyes.

3) Check the audio signal output check (Pin13 of IC700 ~ IC705).
First, check the Audio Data input (Pin3 of IC700 ~ IC705).

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

5) Lastly, check Speaker Terminal (TM701, TM702).

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

< MAIN board top view >

3-22

ONE POINT REPAIR GUIDE

8. NO POWER ON (STANDBY LED IS BLINKING)

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

8-1. AMP FETs

8-1-1. Solution

Please check and replace Q705 ~ Q708, Q711 ~ Q718 on MAIN board.

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

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

- When Some of AMP FETs dead.

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

Notice for FET service

AMP FET : IRF6775

* 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.

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

3-23

ONE POINT REPAIR GUIDE

9. SPEAKER NO AUDIO

Speaker No Audio

9-1. AMP IC

9-1-1. Solution

Please check and replace IC700 ~ IC705 on MAIN board.

9-1-2. 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 : EAN60778301).
CSD has about 5 V on normal state.
When AMP has problem, CSD is LOW state or keep change LOW to HIGH.

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

ju XXWGGwpuGXSYGaGT]]}

wpuGZS[GaGwnuk
wpuG\S ]GaGR]]}

J\GwpuGGpjGTeGjzk

3-24

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No output 5.6 VA

F901 normal?

YES

BD901 normal?

YES

Is the VCC

(11 V ~ 25 V) supplied to IC901

Pin4?

YES

Power line of MAIN PCB is short.

NO

NO

NO

Replace F901 (same fuse).

Replace BD901.

D960, D961 normal?

Check or replace D960, D961.

No 12 V

Is the

VCC 13 VA supplied to IC951

Pin1?

YES

Is there

‘H’ signal at IC951

Pin4?

YES

Check and replace IC951.

Or check line of MAIN PCB is short or not.

NO

NO

Check or replace D962/ D963.

Check P_CTL from μ-com.

3-25

ELECTRICAL TROUBLESHOOTING GUIDE

No -5 V

VCC -7 VA supplied to IC953

Is the

Pin2?

YES

Is there

‘H’ signal at Q953

Base?

YES

Check or replace Q953, Q957.

Or check line of MAIN PCB is short or not.

No output VFD

NO

NO

R965 normal?

YES

Check or replace Q951.

Check P_CTL from μ-com.

NO

Check or replace R965 / D959.

R968 normal?

YES

D957, D959 normal?

YES

ZD951, ZD952 normal?

YES

Check line of FRONT PCB is short or not.

NO

NO

NO

Replace R968.

Replace D957, D959.

Replace ZD951, ZD952.

3-26

ELECTRICAL TROUBLESHOOTING GUIDE

No output AMP gate line

Is the VCC

13 VA supplied to IC952

Pin1 to Pin3?

Check and replace IC952.

Or check line of MAIN PCB is short or not.

NO

R952 normal?

YESYES

Check or replace D951, D952.

NO

Check or replace R952.

3-27

ELECTRICAL TROUBLESHOOTING GUIDE

No AMP output

Is the

C904, C905 voltage

about 380 V?

YES

F911 normal?

NO

NO

YES

PFC P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC904 Pin16?

YES

Check or replace

IC904, Q907 ~ Q910.

AMP P.CTL

OK?

YES

Is the

VCC 12 V supplied to

IC902 Pin8?

NO

NO

NO

NO

Check PFC P.CTL from μ-com.

Replace D908, Q955, PC903.

Check AMP P.CTL from μ-com.

Replace D908, Q956, PC902.Replace F911.

NO

Q911 ~ Q914 OK?

NO

Replace Q911 ~ Q914.

YES

Check or replace IC902

and check Q911 ~ Q914 gate(Pin2)

components (Resistors, Diodes).

3-28

Check or replace D953 ~ D956.

Check line of MAIN PCB is short or not.

ELECTRICAL TROUBLESHOOTING GUIDE

2. SYSTEM PART

Power on.

“HELLO”

Display on FLD

OK?

YES

Volume LED
(LD3V31~LD3V40
LD3V42~LD3V49)

turn on?

NO

NO

CN301

cable connection

OK?

YES

CN301

Pin1, 3, 5

power OK?

YES

CN301

Pin9 ~ 11 data signal

OK?

YES

Q301, 303, 304

grid voltage OK?

Q301,Q303,Q304

grid voltage OK?

NO

NO

NO

NO

NO

Check 17p FFC cable.

Check SMPS board.

Check MAIN board.

Replace DIG301.

Check SMPS board.

YES

When turn the volume,

count is change?

YES

FRONT board OK.

NO

YES

CN3V01

Pin8, 9 +12 V

OK?

YES

Replace LED.

(LD3V09 ~ LD3V24)

CN3V01

pin31, 32

signal OK?

YES

Check MAIN board.

3-29

NO

NO

Check MAIN board.

Check FFC cable.

ELECTRICAL TROUBLESHOOTING GUIDE

3. NO AUDIO PART

CD FUNCTION

Can

disc insert?

YES

Disc reading OK?

YES

NO

NO

LOAD +, - OK?

YES

Is motor impedance

about 12 Ω?

OPU driving

(Focusing & Tracking) OK?

Check OPU.

(Pick-up module)

NO

NO

NO

NO

Is motor_open/ close OK?

(IC408 Pin6, 7)

YES

Check IC501.

Check Loading motor.

Check IC408.

NO

Focusing/

Tracking/ Sled signal

OK?

YES

MON_MPD(CN404 Pin22)

about 180 mV?

Pin51, 52, 53 I2S output

IC407

signal OK?

YES

IC501

Pin N1, N2, N4 I2S input

signal OK?

YES

A

NO

NO

IC407

RF & Servo signal

OK?

YES

Check IC501.

3-30

NO

Check FFC cable

to CN404, CN405.

ELECTRICAL TROUBLESHOOTING GUIDE

USB play

When insert USB,

IC501 PinU7,U8,A7,A8 USB_D

signal OK?

YES

A

AUX

NO

IC300

USB power +5 VU

OK?

YES

NO

Replace IC300.

Pin7, 8 AUX input signal

IC202

OK?

YES

IC202

Pin42,43,44 I2S input signal

OK?

YES

IC202 Pin41

ADC/MIC_data output signal

OK?

YES

A

NO

NO

NO

Check audio cable.

Check IC501.

Replace IC202.

3-31

ELECTRICAL TROUBLESHOOTING GUIDE

POT. IN

Pin21,22 POT. IN input signal

IC202

OK?

YES

IC202

Pin42,43,44 I2S input signal

OK?

YES

IC202 Pin41

ADC/MIC_data output signal

OK?

YES

A

TUNER

NO

NO

NO

Check MIC board.

Check IC501.

Replace IC202.

Pin23,24 TUNER_L/R input

IC202

signal OK?

YES

IC202

Pin42,43,44 I2S input

signal OK?

YES

IC202

Pin41 ADC data output

signal OK?

YES

A

NO

NO

NO

TU500

TUNER_L/R output

signal OK?

YES

Check IC501.

Replace IC202.

3-32

NO

Check +3.3 V of TU500.

ELECTRICAL TROUBLESHOOTING GUIDE

A

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

B

NO

NO

NO

Check IC501.

Check IC501.

Replace IC600.

3-33

ELECTRICAL TROUBLESHOOTING GUIDE

B

Pin28,29,35,36

of IC600, FL/FR± signal

OK?

YES

IC601, 602

FL/FR audio signal

OK?

YES

Pin13 of

IC700,IC701,IC704,IC705

FL/FR audio signal

OK?

YES

IC700, IC701, IC704, IC705.

NO

Check IC600.

NO

Check IC601, IC602.

NO

Check

NO

of IC600, SWL/SWR± signal

Check IC600.

NO

SWL/SWR audio signal

Check IC603, IC604.

NO

IC702,IC703,IC706,IC708

SWL/SWR audio signal

Check

IC702, IC703, IC706, IC708.

Pin26,27,31,32

OK?

YES

IC603,604

OK?

YES

Pin13 of

OK?

YES

±40 V, -28 V, ±5 V

power voltage OK?

YES

Q700,

Q701,Q702,Q703

Q714,Q716,Q719,Q720

YES

OK?

Check Q701,Q702,Q703,Q704

NO

Check SMPS.

NO

Q714,Q716,Q719,Q720.

Check speaker cable connection.

OK

3-34

NO

±40 V, -28 V, ±5 V

power voltage OK?

Check SMPS.

NO

Q721,Q722,Q723,Q724

Check Q704,Q705,Q708,Q709

Q721,Q722,Q723,Q724.

YES

Q704,

Q705,Q708,Q709

OK?

YES

ELECTRICAL TROUBLESHOOTING GUIDE

4. NO LIGHTING (WOOFER SPEAKER)

CD / USB play

CNWS01 Pin3, 4 I2C signal

CNWM02,

OK?

YES

Pin1 +12 V OK?

YES

Check woofer speaker.

NO

NO

Check IC501.

Check SMPS board.

3-35

WAVEFORMS OF MAJOR CHECK POINT

1. WAVEFORM OF SERVO

1

2

3

4

5

Figure 1-1. CD-16M

(IC407 Pin31)

Figure 1-2. SERVO-FE, TE, FOD, RF

(IC407 Pin61, 62, 63 / IC408 Pin1)

3-36

2. WAVEFORM OF MOTOR DRIVE

SL+

8

SP+

6

7

SP-

00

Figure 2-1. SP- & SP+ for driving SPINDLE motor

(IC408 Pin17, 18)

9

SL-

Figure 2-2. SL- & SL+ for driving SPINDLE motor

(IC408 Pin11, 12)

LO-

10

MOT_OPEN

11

LO+(RED)

MOT_CLOSE

Figure 2-3. LO- & LO+ for driving Tray motor

(IC408 Pin9, 10)

3-37

3. WAVEFORM OF AUDIO SIGNAL

12

13

14

LRCK

BCK

DATA

Figure 3-1. (IC501 Pin83, 84, 85) Figure 3-2. AUDIO_L/R

AUDIO_L

AUDIO_R

4. WAVEFORM OF ADC 5. WAVEFORM OF USB

15

16

17

LRCK

MCK

BCK

Figure 4. ADC I2S

(IC202 Pin42, 43, 44)

18

19

3-38

D+

D-

Figure 5. USB D+/D-

(CN502 Pin1, 2 & Pin9, 10)

6. WAVEFORM OF CRYSTAL 7. WAVEFORM OF VFD GRID CURRENT DRIVER

20

21

XI

XO

Figure 6. 12 MHz Crystal

(IC501 Pin27, 28)

22

23

CH1:R327(TP304)

CH2:Q301 Emitter

Figure 7.

3-39

MEMO

3-40

3-41 3-42

VFD

FRONT

10P, 2mm

10P, 2mm

Portable

MIC

MIC Vol

MIC & Portable

10P, 2mm

10P, 1.25mm

15P, 2.5mm6P, 3.96mm

SMPS

15P, 2.5mm6P, 3.96mm

40P, 1.25mm

40P, 1.25mm

MD

10P, 1mm

MAIN

FAN

WIRING DIAGRAM

3-43 3-44

BLOCK DIAGRAMS

1. SMPS BLOCK DIAGRAM

Digital

Power

AMP

F_ L

F_R

SW_L

SW_R

AC Line

Filter Block

(Varistor,

X-Cap

Line Filter

Thermistor )

Pulse

Trans

Half Bridge
LLC Resonant
IC

(ICE1HS01G)

FET

20A

600V

2EA

4.5V

39V

12V

5.6VA

+PVDD
(66V)

AC

FL(+/ -)

VKK

MAIN SMPS
IC
(STR-2A153)

Flyback

MAIN
TRANS

u-com / BT
USB / MPEG

Motor Drive

FAN/LED/ Mic

VFD

PFC
P- CTRL

-5V

-PVDD
(-66V)

GATE

Half

Bridge

LLC

TRANS

(AMP)

Gate
Drive

4.2CH 2300W

OPAMP

AMP
P- CTRL

Totem

pole

PFC IC

(R2A20112A)

Interleaved

DCM

FET

13A

600V

4EA

Gate
Drive

+

PFC Out
(380V)

م

+

م

م

م

م

On/Off

On/Off

م

Vcc

Vcc

On/Off

On/Off

R_ L

R_R

3-45 3-46

2. MAIN SYSTEM BLOCK DIAGRAM

LC78615ERF+ SERVO

AM5890

Motor Drive

A,B,C,D ,E,F, P
D

LD

USB_HUB_DP/DN

CS5346

MLC3730

MCS LOGIC

SPDO/SLDO/FOD/TRD

LOAD±,SLED±,
SPIN±,TR±,F±

OP_SW,CL_SW,UP_SW,DN_SW,D_SENSE

MOT_MUTE,CLOSE,OPEN

ADC_DATA

DAC_MCLK
/BCK/L R CK

PT_L/R

AUX_ L /R

AUX

USB1

Portable

CD_DIN_DOUT

CD_R/W,

BUSY,CD_16M

,

SUBSYQ,

CD_RST

CD_MCK/BCK

/LRCK/DATA

TUNER_L /R

USB2

TUN ER

FRONT

MICOM
R5F100GEAFB

VFD_STB/CLK/DO/RS T
STANDBY_LED,VOL_LED,

VFD_LED/REMOCON
USB_PWR_CTRL/VOL_A/B/
KEY1,2,3

E2PROM_CLK/DATA

TAS5548

PWM

FL±

RL±

DRIVER
IRS2092

(x 4EA)

Front : 385W x 2
Surr : 385W x 2
Woofer : 385W x 2

16.9344MHz

VFD

DIG301

IR

Receiver

LED_CTRL, FILE A/B,
SCRATCH A/B FAN CTRL,
MIC_VOL A/B

Volume/

Key

32.768KHz

MCU_CS/MCU_
RST

MUC_TX/RX

MIC_O_DATA0

(+3. 3V)

(+3. 3V_UCOM)

(+3. 3V_CD, VCC1. 2)

(+5V)

(+3.3V_RF,+3.3V_CD,+1.8V)

(+3. 3V_USB)

(+5V,
+3.3V_ADC)

(+3. 3V)

M

P/UP

DECK
MECHANISM

(VCC50)

12.288MHz

FR±

RR±

SW

DAC IC

AZ4580

DAC IC
AZ4580

DAC IC
AZ4580

FL

RL

FR

RR

SW

FET
IRF6775
(x 12EA)

FL

RL

FR

RR

SW1

SW2

FL

RL

SW1

SW2

I2C/EXT_MUTE/RST

PWM_MCK/BCK/
LRCK

SPENA

AGL _ F /R

AGL _ SW

PROTEC / SD/
DCP

OTW

TH

FAN_CTL

AMP_OSC

MCS Interface

128Mb it
SDRAM

8MByte

Serial Flas h

(+3. 3V_CD)

(+3. 3V_CD)

CLK/DAT/CE/R ST /GP O2

S4308

MIC

MIC_SIG0

MIC_SIG

(+5_MIC)

MIC_DET

MIC COD EC

A DC CODE C

BT

BT_RX, BT_CTS

EEPROM

24MHz

FL1

FL2

3-47 3-48

3. MAIN POWER BLOCK DIAGRAM

SMPS

+5.6VA

TU101

TUNER

YST996

IC100

EEPROM

24CS16

IC600

TAS5548

IC501

MCS

MLC3730

IC502

SDRAM

EM639165

IC407

RF IC

IC509

AZ1117

IC807

USB HUB

SMSC

IC501

VFD

RMC

+1.2V

A

IC510

FLASH

32Mb

IC507

LDO

AZ1117

IC3U01

USB PWR

LM37102D

IC408

MOTOR

AM3053S

+5V

+3.3V

A

3.2VA

VFD

5mA

3mA

150mA

25mA

70mA

+5V

370mA

LED

STBY

20mA

2mA

2.393A

450mA

Pick up

80mA

15mA

60mA

130mA

-> 0mA

20mA 20mA

160mA

ADC

IC202

CS5346

20mA

VKK

FL

±

550mA

1A

287mA

Bluetooth

Option

38mA

CP Chip

Option

7mA

+3.3V

IC204

LDO

LM37102D

IC505

LDO

TJ4220

IC102

RESET

AZ7027

IC103

PWR SENS

AZ7027

2mA 2mA

10mA

+3.3V

3.2V

80mA

USB HUB

IC506

AZ1117

USB HUB

+1.2V

IC101

U_COM

RENESAS

22mA

50mA

+12V(2A)

IC506
MIC PRE AMP
S4308

FAN X 1

FRONT SPK

LED(32EA)

Woofer SPK
LED(68EA)

100mA 2mA

+62V

-5V

-62V

-48V

IRS2092x6
AMP IC

IRF6775Mx12
FET

IC601~4

OP AMP

AZ4580

IC707

LM37102D

+5V

16.3 Apk

16.3 Apk

150mA

100mA

240mA

480mA

980mA

124mA

24mA

100mA

FRONT LED

16EA

160mA

442mA

RTC3.0

3-49 3-50

CIRCUIT DIAGRAMS

1. SMPS - POWER #1 CIRCUIT DIAGRAM

WHEN SERVICING THIS CHASSIS, UNDER NO
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN
BE MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES
IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
SPECIAL COMPONENTS ARE SHADED ON THE

SCHEMATIC FOR EASY IDENTIFICATION. THIS
CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER
FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.

IMPORTANT SAFETY

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

SMPS #1

EAX65367301_18.1.6_SMPS_SD_1

2014. 01. 25

CAUTION:

Danger if fuse is incorrectly replaced.

Replace only with the type identical to fuse rating

and(or) model name described in main label.

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

3-51 3-52

2. SMPS - POWER #2 CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

SMPS #2

EAX65367301_18.1.6_SMPS_SD_2

2014. 01. 25

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

3-53 3-54

3. MAIN - CD DSP CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

CD DSP

EAX65564602_2.1.0_MAIN_SD_1

2014. 01. 25

3-55 3-56

4. MAIN - RF / SERVO CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

RF/SERVO

EAX65564602_2.1.0_MAIN_SD_3

2014. 01. 25

3-57 3-58

5. MAIN - ADC / PWM CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

ADC/PWM

EAX65564602_2.1.0_MAIN_SD_4

2014. 01. 25

3-59 3-60

6. MAIN - AMP CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

AMP

EAX65564602_2.1.0_MAIN_SD_5

2014. 01. 25

3-61 3-62

7. FRONT VOLUME CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

FRONT VOLUME

EAX65547302_1.1.0_Front_SD

2014. 01. 25

3-63 3-64

8. MIC & PORTABLE CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

MIC & PORTABLE

EAX65589002_1.1.0_mic,ptb_SD

2014. 01. 25

3-65 3-66

9. FRONT SPEAKER MAIN CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

FRONT SPK MAIN

EAX65664101_6.1.3_F_SPK_LIGHTING_MAIN_SD

2014. 01. 25

3-67 3-68

10. FRONT SPEAKER SUB CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

FRONT SPK SUB

EAX65664201_6.1.3_F_SPK_LIGHTING_SUB_SD

2014. 01. 25

3-69 3-70

11. WOOFER SPEAKER MAIN CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

WF MAIN

EAX65684301_6.1.3_SPK_LED_LIGHTING_SD

2014. 01. 25

3-71 3-72

12. WOOFER SPEAKER SUB CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

WF SUB

EAX65664001_6.1.3_WF_SPK_LIGHTING_SUB_SD

2014. 01. 25

CIRCUIT VOLTAGE CHART

1. CONNECTORS 2. CAPACITORS

3-73 3-74

Location Value & Spec Voltage_Spec

Play back Standby

positive (+) positive (+)

C102 4.7uF/50V 50V 1.75 2.00

C104 1uF/50V 50V 0.00 0.00

C106 100uF/16V 16V 10.65 10.84

C239 100uF/16V 16V 3.30 3.31

C244 47uF/16V 16V 5.17 5.18

C260 47uF/16V 16V 5.05 5.14

C311 47uF/50V 50V 41.30 41.40

C402 100uF/16V 16V 5.15 5.17

C404 47uF/16V 16V 3.32 3.31

C429 220uF/16V 16V 5.18 5.17

C479 220uF/16V 16V 1.61 1.65

C481 47uF/16V 16V 0.00 0.02

C501 1000uF/6.3V 6.3V 3.08 3.15

C517 47uF/16V 16V 1.23 1.20

C5A9 47uF/16V 16V 1.23 1.20

C643 100uF/16V 16V 5.08 5.17

C700 100uF/16V 16V 0.00 0.00

C707 2200uF/80V 80V 65.80 65.50

C728 2200uF/80V 80V 65.75 65.80

C752 1000uF/80V 80V 65.80 65.50

C798 1000uF/80V 80V 65.75 65.80

C881 100uF/16V 16V 11.82 11.86

Pin No

Location

Pin Name

Spec

(V)

Spec Range

(V)

CABLE

Input

Margin

(V)

CABLE
Output

Margin

(V)

CN106 (MAIN) CN901 (SMPS) CN106 (MAIN)

1 VKK 39 35 ~ 43 40.9 1.90 40.9 1.9

2 FL+ 7.2 na 7.65 0.45 7.65 0.45

3 FL- 2.5 na 2.74 0.24 2.76 0.26

5 -5V -5 -4.8 ~ -5.2 -5.01 -0.01 -5.01 -0.01

7,8,9 +5.6V 5.6 5.2~5.8 5.67 0.07 5.66 0.06

13 +12V 12 11 ~ 13 12 0.00 11.99 -0.01

14 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.2

15 GATE -54 -52 ~ -56 -53.8 0.20 -53.8 0.2

CN502 CN304(USB) CN103 (MAIN)

2,3 +5.6VA 5.6 5.2~5.8 5.65 0.05 5.65 0.05

CN105 CN301 (Front) CN105 (MAIN)

13 FL- 2.5 na 2.83 0.33 2.78 0.28

19 VKK 39 35 ~ 43 41.3 2.30 40.8 1.8

20 FL+ 7.2 na 7.35 0.15 7.32 0.12

22 3.3V 3.3 3.0~3.6 3.26 -0.04 3.26 -0.04

30 12V 12 11 ~ 13 11.92 -0.08 11.94 -0.06

CN404 (MD) CN404 (MAIN)

1,8,9 VCC 5 4.8~5.2 4.87 -0.13 5.08 0.08

CN110 CN902 (SMPS) CN110 (MAIN)

1,2 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.20

5,6 +B 66 64 ~ 68 65.5 -0.50 65.5 -0.50

CN504 (BT) CN504 (MAIN)

10 VDD 3.3 3.0~3.6 3.27 -0.03 3.27 -0.03

3-75 3-76

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD

(TOP VIEW)

3-77 3-78

SMPS P.C.BOARD

(BOTTOM VIEW)

3-79 3-80

2. MAIN P.C.BOARD

(TOP VIEW)

3-81 3-82

MAIN P.C.BOARD

(BOTTOM VIEW)

3-83 3-84

3. FRONT VOLUME P.C.BOARD

3-85 3-86

4. MIC & PORTABLE P.C.BOARD

5. FRONT SPEAKER MAIN P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

6. FRONT SPEAKER SUB P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

3-87 3-88

7. WOOFER SPEAKER MAIN P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

8. WOOFER SPEAKER SUB P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)