LG LM-W2340A, LMS-W2340 Service Manual

MINI HI-FI SYSTEM

SERVICE MANUAL

CAUTION

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

P/N : 3829RAT112N JANUARY, 2005

MODEL: LM-W2340A, LMS-W2340

SERVICE MANUAL MODEL: LM-W2340A, LMS-W2340

- 1-1 -

[CONTENTS]

❍ SECTION 1.GENERAL

• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

• SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

❍ SECTION 2.ELECTRICAL SECTION

• TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

• PRINTED CIRCUIT BOARD DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

❍ SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

❍ SECTION 4. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

❍ SECTION 5. REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

- 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.

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.

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 this.

6) Never attempt to disassemble the pick-up.
Spring by 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.

Storage in conductive bag

Drop impact

NEVER look directly at the laser beam, and don’t let
contact fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

Pressure

SECTION 1. GENERAL

- 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 of 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 (1M Ω)

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.

CLEARING MALFUNCTION

You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).
Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of
the volume knob for more than 3 seconds.
If you reset your unit, you must reenter all its settings(stations, clock, timer)

NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.

2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.

Resistor
(1 Mohm)

Conductive
Sheet

Resistor
(1 Mohm)

Armband

RESET jump wire

VOLUME

VOLUME KNOB

DOWN

UP

- 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 sur-

face 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 -

❏ SPECIFICATIONS

[General][CD]

[Tuner]

AM

FM

(MW)

[Amp]

[

TAPE

]

Power supply Refer to the back panel of the unit.
Power consumption 220W 170w 150w 110w

Mass 12kg 10kg 10kg
External dimensions (W x H x D) 280 x 370 x 372 mm
Frequency response 40 - 18000 Hz
Signal-to-noise ratio 70 dB
Dynamic range 70 dB
Tuning Range 87.5 - 108.0 MHz or 65 - 74 MHz
Intermediate Frequency 10.7 MHz
Signal to Noise Ratio 60/55 dB
Frequency Response 60 - 10000 Hz
Tuning Range 522 - 1611 kHz or 530 - 1610 kHz
Intermediate Frequency 450 kHz
Signal to Noise Ratio 35 dB
Frequency Response 120 - 2000 Hz
Output Power 310W + 310W 230W + 230W 310W + 310W 230W + 230W
T.H.D 0.7%
Frequency Response 42 - 25000 Hz
Signal-to-noise ratio 75 dB
Tape Speed 4.75cm/sec
Wow Flutter 0.25% (MTT -111, JIS-WTD)
F.F/REW Time 120sec (C-60)
Frequency Response 125 - 8000Hz
Signal to Noise Ratio 43dB
Channel Separation 50dB(P/B)/45dB(R/P)
Erase Ratio 55dB (MTT-5511)

Designs and specifications are subject to change without notice.

LM-W5040A/D/X

LM-W3140A/D/X

MODEL

SECTION

LM-W4040A/D/X

LM-W2340A/D/X

[Front Speakers]

Model name LMS-W5040 LMS-W4040 LMS-W3140 LMS-W2340
Type

3Way 4Speaker 3Way 4Speaker 3Way 4Speaker 3Way 4Speaker
Impedance 6Ω 6Ω 6Ω 6Ω
Frequency Response 45-20000Hz 45-20000Hz 45-20000Hz 45-20000Hz
Sound Pressure Level 85dB 85dB 85dB 85dB
Rated Input Power 250W 230W 310W 230W
Max. Input Power 500W 460W 620W 460W
Net Dimensions(WxHxD) 255x425x300 255x425x300 255x425x300 255x425x300
Net Weight 10.4 10.4 10.4 10.4

Model name LMS-W5040S
Type 2Way 3Speak

24Ω

er
Impedance
Frequency Response 60-20000Hz
Sound Pressure Level 85dB
Rated Input Power 100W
Max. Input Power 200W
Net Dimensions(WxHxD) 187 x 425 x 248
Net Weight 5.3

[Surround Speakers]

Model name LMS-W5040W, LMS-W4040W
Type 1W6Ωay 1Speaker
Impedance
Frequency Response 40-15000Hz
Sound Pressure Level 83dB
Rated Input Power 310W
Max. Input Power 620W
Net Dimensions(WxHxD) 255 x 425 x 300
Net Weight 9.2

[Woofer Speakers]

, 87.5 - 108.0 MHz

12kg

- 1-6 -

- 2-1 -

■ CD PART

❏ TROUBLESHOOTING GUIDE

TURN ON CD

CONNECTOR CHECK ( PN808,PN807 )

CHECK POWER SUPPLY CIRCUIT( PN808 )

CHECK MICOM INTERFACE CIRCUIT( PN807 )

CHECK MICOM INTERFACE CIRCUIT( PN807 )

CONNECTOR CHECK(PN801,PN802)

CHECK PICKUP MOVEMENT

CHECK BA5810FP (IC803)

CHECK MN6627933CG (IC801)

CHECK AN22004 (IC802)

CONNECTOR CHECK (PN808)

CONNECTOR CHECK

( PN808,PN807,PN802,PN801 )

OPEN CLOSE CHECK

“ READING ”

DISPLAY CHECK

READING OK CHECK

IF PLAY, AUDIO

OUTPUT CHECK

OK

NO

NO

NO

NO

YES

YES

YES

YES

YES

SECTION 2. ELECTRICAL

- 2-2 -

CONNECTOR LOCKING CHECK ( PN808,PN807 )

DEFECTIVE MAIN

POEWR SUPPLY

DEFECTIVE MICOM

DEFECTIVE IC803

DEFECTIVE

MECHANISM

CHECK POWER SUPPLY CIRCUIT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

CHECK VOLTAGE CHANGE OF OPEN CLOSE ,

AND BTLMUTE VOLTAGE(= 5V)

(PN807 PIN 20:OPEN, 19:CLOSE, 4:BTLMUTE)

CHECK VOLTAGE CHANGE LO+, LO- OF IC803

(PN807, PIN OPEN:20, CLOSE:19)

YES

YES

YES

NO

NO

NO

NO

• OPEN CLOSE NG

- 2-3 -

CONNECTOR LOCKING CHECK

(PN808,PN807,PN802,PN801 )

DEFECTIVE CONNECTOR OR

MAIN POWER SUPPLAY

DEFECTIVE IC805

DEFECTIVE MICOM OR

CONNECTOR

DEFECTIVE MICOM OR

CONNECTOR

DEFECTIVE IC801

CHECK VOLTAGE THE PIN 2 OF IC805

IC805 PIN2 : 3.3V

CHECK RESET SIGNAL OF PN807

PN807 PIN12 : 5V

CHECK POWER SUPPLY

PORT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

CHECK POWER SUPPLY

PORT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

CHECK MICOM INTERFACE

CIRCUIT( PN807 )

PN807 PIN 11,13,14,15 SIGNAL CHECK

(11: STAT, 13: MDATA, 14:MCLK, 15:MLD)

CHECK THE WAVE FORM #1

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

• “ READING ” DISPLAY CHECK (= ONLY “CD “DISPLAY)

- 2-4 -

A

B

C

D

E

CONNECTOR LOCKING

CHECK(PN801,PN802)

DOES SLED MOVE ?

CHECK PN802 PIN 3,4( SL+,SL-)

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

DEFECTIVE PICKUP OR

IC803 OR IC801

DEFECTIVE PICKUP OR

IC802

DEFECTIVE PICKUP OR

IC803

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

CHECK PN802 PIN 10( LD )

CHECK PN801 PIN 14,15

(TA- ,TA+)

CHECK PN802 PIN

5,6( SP+,SP-)

CHECK PN801 PIN 13,16

( FA-, FA+)

DOES LENSE MOVE ?

(= UP & DOWN)

DOES LASER LIGHT ?

DOES SPINDLE ROTATE ?

IS READING OK ?

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

• READING OK CHECK (= “NO DISC” DISPLAY)

- 2-5 -

CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SLED MOTOR

A

DOES SL+ WAVEFORM APPEAR AT

( IC803 PIN14 AND PN802 PIN3)

WAVEFORM #2

SLED MOTOR WAVE

DOES SLIN WAVEFORM

APPEAR AT

( IC803 PIN 5)

WAVEFORM #2

SLED DRIVE WAVE

YES

YES

NO

NO

NO

NO

NO

• READING OK CHECK #A (= “NO DISC” DISPLAY)

- 2-6 -

CHECK PN801 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN801

CONNECTOR

DEFECTIVE PICKUP

FOCUS ACTUATOR

B

DOES FA+ WAVEFORM APPEAR AT

( IC803 PIN15 AND PN801 PIN16)

WAVEFORM #3

FOCUS COIL DRIVE WAVE

DOES FAIN- WAVEFORM

APPEAR AT

( IC803 PIN 26)

WAVEFORM #3

FOCUS DRIVE WAVE

YES

YES

NO

NO

NO

NO

NO

• READING OK CHECK #B (= “NO DISC” DISPLAY)

- 2-7 -

CHECK PN801 CONNECTOR LINE

DEFECTIVE IC805

DEFECTIVE IC802

DEFECTIVE Q801 OR

D811

DEFECTIVE PN801

CONNECTOR

DEFECTIVE PICKUP

LASER PART

C

IS ?V APPLIED TO PIN10 OF

PN801

LASER SUPPLY VOLTAGE CHECK

IS 3.3 V APPLIED TO

PIN3 OF IC802

RF IC SUPPLY VOLTAGE

CHECK

IS 2.0 V PIN2 OF IC802

LASER CONTROL
VOLTAGE CHECK

YES

YES

NO

NO

NO

NO

NO

NO

• READING OK CHECK #C (= “NO DISC” DISPLAY)

- 2-8 -

CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SPINDLE MOTOR

D

DOES SP+ WAVEFORM APPEAR AT

( IC803 PIN12 AND PN802

PIN6)WAVEFORM #4

SPINDLE MOTOR DRIVE WAVE

DOES SPIN WAVEFORM

APPEAR AT( IC803 PIN 6)

WAVEFORM #4

SPINDLE DRIVE WAVE

YES

YES

NO

NO

NO

NO

• READING OK CHECK #D (= “NO DISC” DISPLAY)

- 2-9 -

CHECK PN802 CONNECTOR LINE

DOES ARF SIGNAL APPEAR?

(IC802 PORT 8)
WAVEFORM #6

DOES FE, TE SIGNAL APPEAR?

(IC802 PORT FE:23, TE:21)

WAVEFORM #6

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP OR

IC802

DEFECTIVE PICKUP OR

IC802

DEFECTIVE IC801

E

DOES TA+ WAVEFORM APPEAR AT

( IC803 PIN17 AND PN801 PIN15)

WAVEFORM #5

TRACKING COIL DRIVE WAVE

DOES TAIN- WAVEFORM

APPEAR AT

( IC803 PIN 23)

WAVEFORM #5

TRACKING DRIVE WAVE

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

• READING OK CHECK #E (= “NO DISC” DISPLAY)

- 2-10 -

■ AUDIO PART

P-SENS PART CHECK

ZD 701(+) Voltage check

IC301 26PIN PATTERN Check

Half-wave rectification wave form check

R746 check, then ZD701 replacement

D713 Replacement

VKK CHECK

CN305 4pin DC -33V check

IC301 51PIN check

ZD 700 -33V check

ZD 754 turn on check

Pattern disconnection check

D707, D708 replacement

normal

ZD700 replacement

Refer to power

supply check

C763 -33V and less check

Q754 replacement

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

- 2-11 -

POWER CHECK

Every kinds of Fuse check

C720(+), C770(-) DC power output check

C725(+), C729(-) DC power output check

IC704, IC705, IC705 power output check

IC704, IC705, IC710 power output check (12V)

IC709 DC5V check

CN513 7PIN 5V check (at CD Function)

normal operation

Fuse replace

CN704 1, 2, 3, 4, 5, 6, 7, 9, 10 AC voltage output check

D713(PBU604) check

Power supply Ass’y check
and transformer replacent

IC301 5V Power output
PN304/CN304 15 PIN check

Check

IC501(BU2090) check & replace

IC501(BU2090) 14PIN HIGH check

Q905 Base “High”(L103M) check & replace

Power supply Ass’y check
and transformer replacent

CN704, 11, 12 pin AC power output check

IC704, IC705 , IC710 check and replacement

IC301 78PIN 5V check

IC709 replacement

Q904(A1273) Base Low check

Q904, CD Ass’y check replacement

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

- 2-12 -

Muting circuit Troubleshooting (if MUTE)

Q752(A102) Base “LOW”

C720(+), C770(-) DC power output check

MUTE

c-COM operation status check

Each appropriate TR replacement

Check each function input and operation
status check

Refer to IC601(TDA7429D) IC specification

c-COM check (and CLK/DATA check)

IC705 7812 operation status check (DC12V)

PN701/CN701 connection status check

ZD601 9.1V check

IC601 39PIN (over 8V) check and power
supply circuit check

Q702(A102) operation status check

Q702(A102) Replace if defective

c-COM 2PIN(A-MUTE)

LINE check

No sound

Input check (AUX➞29,36 TUNER➞30,35
TAPE➞28/37 CD➞31/34 PIN)

IC 601 24/25 PIN Output check

IC601 input check (22/21PIN)

IC601 output check (14PIN)

normal

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

- 2-13 -

Refer to IC202 Troubleshooting

IC501 10 PIN(PB MUTE) operation status check

c-COM 301 10,8 PIN CLK/DATA operation status check

Specific FUNCTION MODE has no sound (TDA7468D)

TAPE

IC202 output check (5,20 PIN)

IC601 36,29 PIN signal input check

IC202 input check (HEAD input) "A"DECK
1,24 "B"DECK 23,2

AUX

JK102 signal input check

IC601 36,29 PIN signal input check

CD

CN603 1,3 PIN signal check and refer to CD Troubleshooting

IC601 34,31 PIN signal input check

TUNER

Refer to TUNERMODULE

IC601 35,30 PIN signal input check

DECK HEAD WIRE connection status check

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

- 2-14 -

MIC

IC601 function input check

Refer to IC404 Troubleshooting

IC301 Troubleshooting

C301 17, 46, 72, 90 power applied check

IC301 15PIN 5V applied check

X301 oscilates or not

When IC301 11Pin voltage input. High➞Low➞High

IC301 replace

Refer to power supply check

P-SENS terminal check

X301 replace

RESET circuit check

YES

YESYES

YES

YES

YES

YES

NO

NO

NO

NO

- 2-15 -

IC501,502,302(BU2029) Troubleshooting

IC501 16PIN power applied check

IC501 2, 3 PIN CLK Data check

CONTROL function check

normal

Refer to IC301 Troubleshooting

Refer to power supply check

IC501 replace Pattern check between IC301 and IC501

IC301 3,4 PIN data check
(When switched to CD, TAPE Function)

IC601(TDA7468D) Troubleshooting

IC601 1PIN power applied check

IC601 35,30 Pin waveform output check

IC601 36,29Pin waveform input check

IC601 34,31Pin waveform output check

normal

IC601 21,22 Pulse waveform check
(with tunning VOL DIAL)

Refer to power supply check

IC301 10,8Pin check

IC601 replace

MICOM(10,8) - IC601(21,22) Pattern checkIC601 replace

IC301 Troubleshooting

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

- 2-16 -

IC701(AMP MODULE) Troubleshooting

AMP ON/OFF check

10,13Pin signal input check

18,5Pin(-), 20, 3Pin(+) Power check

6,17 Pin signal output check

OK

IC502 6PIN operation status check

-9V(IC706) +9(IC710) replace if defective

-9V(IC706) +9(IC710) replace if defective

Refer to Muting circuit

RELAY operation status check (RY703,701)

Refer to power supply check

-9V(IC706) +9(IC710) operation status check
(9,14PIN check)

IC701(AMP MODULE) Troubleshooting

AMP ON/OFF check

9Pin signal input check

12Pin(-), 15Pin(+) voltage check

12 Pin signal output check

OK

IC502 6PIN operation status check

Refer to Muting circuit

Refer to power supply check

RELAY operation status check (RY702)

-9V(IC706) +9(IC710) operation status check
(11,7 PIN check)

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

- 2-17 -

PLAY check (KIA6289N)

IC202 18Pin VCC power applied

IC202 5,20 Pin signal output check

Muting circuit check

Refer to power supply check

Deck Mecha operation performance check

Deck Mecha replace

IC202 replace

Rec check (Q252, Q202 ON : R273, R223 High)

IC601 33,32 OUT check

IC202 11,14 Pin signal input check

IC202 9,16 Pin output check

IC201 6(12V), 4 Pin High check

L203 2,3PIN oscilation check

Deck replace

Q253, Q203 Base "Low" check

Q253,Q203 replace

Refer to IC203 Troubleshooting

IC202 18Pin VCC voltage check

Voltage check, IC203 Troubleshooting check

C236(+) power supply check

Refer to power supply check

IC203 Troubleshooting check

Q208 replace

L203 replace

Q208 Base 0.6V supplied check

Q208 Collector Low

Q207 replace

normal

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

- 2-18 -

Dubbing check ("NORMAL or REC"//"HIGH")

Q252,202 "OFF"//"ON" : R273,223 "Low"//"HIGH"

Q253,203 "ON"//"OFF"

Refer to REC Check

IC203 Troubleshooting check

USB IC802(PCM2702)

LM-W5040,3140 applied, LM-W4040,2340 not applied

2, 17, 27 5V voltage check

1.28 12MHz operation status check

IC705 +5V operation check

YES

YES

YES

NO

NO

- 2-19 -

• CD PART WAVEFORMS OF MAJOR CHECK POINT

- 2-20 -

- 2-21 -

❏ INTERNAL BLOCK DIAGRAM of ICs

• NJM2706 (IC401)

BLOCK DIAGRAM

PIN CONFIGURATION

- 2-22 -

• AF230W20CM (IC701)

BLOCK DIAGRAM

PIN CONFIGURATION

- 2-23 -

• AF310W20CM (IC701)

BLOCK DIAGRAM

PIN CONFIGURATION

PIN DESCRIPTION

Pin Number Symbol Type Description

1 N_DO O NMOS Drain Output
2 VSS G Negative supply Voltage
3 N_CS P NMOS Current Sense Input
4 P_CS P PMOS Current Sense Input
5 AM_F2 O AM Mode control Input 2
6 AM_F1 G AM Mode control Input 1
7 VEE I Negative supply Voltage
8 STANDBY I ON/OFF control
9 IN P Audio Input
10 P_STATE I Protection State
11 VCC I Positive supply Voltage
12 OUT O Audio Output
13 GND I Signal Ground
14 SUBGND P Sub Ground
15 VDD I Positive supply Voltage
16 P_DO O PMOS Drain Output

- 2-24 -

PIN DESCRIPTION

Pin Number Symbol Type Description

1 L_DO O L-Channel Drain Output
2 SUBGND G Sub Ground
3 VDD_L P L-Channel Positive supply Voltage
4 L_GND P L-Channel Signal Ground
5 VSS_L O L-Channel Negative supply Voltage
6 L_OUT G L-Channel Audio Output
7 AM_F1 I AM Mode control Input 1
8 L_CS I L-Channel Current Sense Input
9 VCC P Positive supply Voltage
10 L_IN I L-Channel Audio Input
11 STANDBY I ON/OFF control
12 P_STATE O Protection State
13 R_IN I R-Channel Audio Input
14 VEE P Negative supply Voltage
15 R_CS I R-Channel Current Sense Input
16 AM_F2 I AM Mode control Input 2
17 R_OUT G R-Channel Audio Output
18 VSS_R O R-Channel Negative supply Voltage
19 R_GND P R-Channel Signal Ground
20 VDD_R P R-Channel Positive supply Voltage
21 SUBGND G Sub Ground
22 R_DO O R-Channel Drain Output

• TC4052BP (IC801)

BLOCK DIAGRAM

PIN ASSIGNMENT

❏ BLOCK DIAGRAM

2-25 2-26

2-27 2-28

❏ SCHEMATIC DIAGRAM

• MAIN SCHEMATIC DIAGRAM

2-29 2-30

• DECK SCHEMATIC DIAGRAM

2-31 2-32

• AUDIO/WOOFER AMP, POWER SCHEMATIC DIAGRAM

2-33 2-34

• FRONT, MIC SCHEMATIC DIAGRAM

2-35 2-36

• USB & AV, WOOFER SCHEMATIC DIAGRAM

2-37 2-38

• CDP SCHEMATIC DIAGRAM

2-39 2-40

❏ WIRING DIAGRAMS

2-41 2-42

❏ PRINTED CIRCUIT DIAGRAMS

• MAIN P.C. BOARD (SOLDER SIDE)

2-43 2-44

• MAIN P.C. BOARD (COMPONENT SIDE)

2-45 2-46

• FRONT P.C. BOARD (SOLDER SIDE)

2-47 2-48

• FRONT P.C. BOARD (COMPONENT SIDE)

2-49 2-50

• POWER, MIC, WOOFER P.C. BOARD (COMPONENT SIDE)

2-51 2-52

• POWER, MIC, WOOFER P.C. BOARD (SOLDER SIDE)

2-53 2-54

• AMP, USB & AV P.C. BOARD (COMPONENT SIDE)

2-55 2-56

• AMP, USB & AV P.C. BOARD (SOLDER SIDE)

2-57 2-58

• CDP P.C. BOARD (SOLDER SIDE) • CDP P.C. BOARD (COMPONENT SIDE)

3-1 3-2

A26

300

450

301

290

266

267

268

272

269

270

275

A49

274

276

452

262

261

258

254

255

263

265

278

273

253

251

250

252

288

259

264

257

277

260

256

285

271

A41

451

283

284

A47

302

286

A48

305

285

281

282

A43

A00

280

A46

NOTE) Refer to “SECTION 5 REPLACEMENT

PARTS LIST” in order to look for the
part number of each part.

• CABINET AND MAIN FRAME SECTION

SECTION 3. EXPLODED VIEWS

3-3 3-4

• TAPE DECK MECHANISM : DOUBLE AUTO REVERSE DECK (RIGHT)

401

003

502

501

502

501

402

009

401

401

011

013

409

032R

038

026

028

027

040

029

022

015

A01

019

037R

018

017

016

006

007

402

008

020

505

021

023

504

025

035

039

001

009

046

031

028

002R

036

3-5 3-6

• TAPE DECK MECHANISM : DOUBLE AUTO REVERSE DECK (LEFT)

037L

505

508

506

002L

007

402

008

016

017

018

019

021

020

505

015

023

025

504

403

022

027

028

009

031

039

035

409

406

032L

026

028

038

013

401

009

011

401

009

402

003

507

502

501

502

040

036

3-7 3-8

• CD MECHANISM

416

151

156

418

169

173

171

170

419

163

422

165

159

164

417

417

416

166

167

177

175

172

162

153

168

155

- 4-1 -

839

841

840

836

831

837

838

830

827

829

821

820

826

825

827

822

823

824

834

833

832

828

(LEFT)

(LEFT)

(LEFT)

(RIGHT)

(RIGHT)

(RIGHT)

❏ MODEL: LMS-W2340

SECTION 4. SPEAKER PART

- 4-2 -