LM LM-W2340 Service Manual

- 1-1 -

[CONTENTS]

❍ SECTION 1.GENERAL

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

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

❍ 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 -

SECTION 1. GENERAL

❏ 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

- 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

- 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.

- 2-1 -

SECTION 2. ELECTRICAL

■ CD PART

❏ TROUBLESHOOTING GUIDE

TURN ON CD

CONNECTOR CHECK ( PN808,PN807 )

CHECK POWER SUPPLY CIRCUIT( PN808 )

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

YES

- 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

• 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

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

- 2-4 -

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

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

- 2-5 -

CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SLED MOTOR

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

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

- 2-6 -

CHECK PN801 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN801

CONNECTOR

DEFECTIVE PICKUP

FOCUS ACTUATOR

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

• 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

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

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

- 2-8 -

CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SPINDLE MOTOR

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

• 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

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

• 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

- 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

IC5019BU2090 check & replace

IC501(BU2090) 14PIN HIGH check

Check and replace defective

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

- 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

- 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

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

- 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

- 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

- 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

IC502 6PIN operation status check

-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

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)

- 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

- 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

- 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

+ 236 hidden pages

LM LM-W2340 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual