LG DVD-6054, DVD-6184, DV-7511-E-6-S, DV-7811-E-6-S Service manual

DVD VIDEO PLAYER

SERVICE MANUAL

MODELS : DVD6054/DVD6184

(DV7511E6S/DV7811E6S)

MODELS : DVD6054/DVD6184(DV7511E6S/DV7811E6S)

SERVICE MANUAL

P/NO : 3829RHP017A

SEPTEMBER, 2003

Printed in Korea

CAUTION

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

DVD6054 DVD6184

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-2

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

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SPECIFICATIONS ...................................................................................................................... 1-4

1-2

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audio-video service technicians.

When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

Special components are also used to prevent x-radiation, shock and fire hazard. These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics Corporation.

Circuit diagrams 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.

CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice:

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign particles.

4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

5. No lead or component should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

A.C. Voltmeter

1500 OHM

10 WATT

Place this probe on each exposed metal part.

Good Earth Ground such as the Water Pipe, Conduit, etc.

0.15uF

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-3

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an elec-

trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of its assemblies.

3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped.

5. Do not apply AC power to this DVD and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed.

6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES 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 ES 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 grouned-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

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

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

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

Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally 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 ES device.)

1-4

SPECIFICATIONS

• GENERAL

Power requirements AC 120V, 60Hz Power consumption 14W Dimensions(approx.) 430 x 43 x 242mm (W/h/d) Weight(approx.) 2.34kg Operating temperature 5˚C to 35˚C (41˚F to 95˚F) Operating humidity 5% to 90%

• SYSTEM

Laser Semiconductor laser, wavelength 650nm Signal system PAL/NTSC Frequency response DVD (PCM 96kHz): 8Hz to 44kHz

DVD (PCM 48kHz): 2Hz to 22kHz

CD: 8Hz to 20kHz Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only) Harmonic distortion Less than 0.008% Dynamic range More than 100dB(DVD)

More than 95dB(CD)

• OUTPUTS

VIDEO OUT 1 V (p-p) 75 Ω, sync negative, RCA jack x 1 (TO TV) Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1 Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 600 Ω,

RCA jack (L, R) x 1 (TO TV)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. EXPLODED VIEWS ................................................................................................................2-2

1. Cabinet and Main Frame Section ...........................................................................................2-2

2. Packing Accessory Section....................................................................................................2-5

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

463

250

A00

463

300

283

280

A42

A49

A47

A48

A44

A43

A46

260

261

463

320

463

467

463

465

452

SCART&5.1CH MODEL ONLY

OPTIONAL PART

BCD

2-3

• Cabinet and Main Frame Section• Cabinet and Main Frame Section Part List

S AL LOCA.NO PART NO(LG) A B DESCRIPTION SPECIFICATION REMARKS

ASSEMBLY PARTS SECTION

A42 6871R-5725A O PWB(PCB) ASSEMBLY,TOTAL DV7000S 5TOOL KEY SH

A42 6871R-5728A O PWB(PCB) ASSEMBLY,TOTAL DV7000S 8TOOL KEY SH

A43 3501RF3007C O BOARD ASSEMBLY DVD DV7811E4M HA3GLL

A43 3501RF6694F O BOARD ASSEMBLY DVD DV7511E6L HA8PLL

A44 3141R-D003F O CHASSIS ASSEMBLY DV7510E LSI,MTK 55MM NSP

A44 3141R-D004F O CHASSIS ASSEMBLY DV7810E MTK 43MM

A46 6885R-1015D O SUB PWB(PCB) ASSEMBLY DV7511E6S HA8PLL

A46 6885R-1015J O SUB PWB(PCB) ASSEMBLY DV7811E6S HA8PLL

A47 6871R-7604C O PWB(PCB) ASSEMBLY,TOTAL DV7000S SMPS SH 220V(CE)

A47 6871R-7604D O PWB(PCB) ASSEMBLY,TOTAL DV7000S LSI SMPS SH 220V (CE)

A48 6871R-7601C O O PWB(PCB) ASSEMBLY,TOTAL DV7000S MTK SH SCART

A49 6871R-5715A O PWB(PCB) ASSEMBLY,TOTAL DV7000S 5TOOL TIMER SH

A49 6871R-5718A O PWB(PCB) ASSEMBLY,TOTAL DV7000S 8TOOL TIMER SH

PARTS SECTION

250 3110R-D001A O CASE DV7000 PRESS 430-55(A288G)

250 3110R-D004A O CASE DV7000 PRESS 43MM A288G

260 3140R-D002A O O CHASSIS DV7000 PRESS MAIN NSP

261 5040R-0069D O O RUBBER FOOT(SILICONE SPONGE DS-08 T=

280 3721R-F306F O PANEL ASSEMBLY,FRONT[NORMAL PA DV7511E6L HA8PLL NSP

280 3721R-F318C O PANEL ASSEMBLY,FRONT[NORMAL PA DV7811E4M HA3GLL NSP

283 3581R-T068B O DOOR ASSEMBLY TRAY DV7500 (CHINA)

283 3581R-T069A O DOOR ASSEMBLY TRAY DV7800 (SPRAY)

300 6410RCHX03A O O POWER CORD CE-503/JL201B H03VVH2-F 2X0.75

320 3720R-D072F O PANEL,VIDEO DVD DV7510E PRESS LSI,MTK 55MM

320 3720R-D074F O PANEL,VIDEO DVD DV7810E PRESS MTK 43MM

SCREW

452 353-051A O SCREW SPECIAL

463 353-051G O O SCREW,DRAWING + 2 D3.0 L8.0 MSWR3/FN TB ROUN

465 353-046K O O SCREW SPECIAL (3X10 B.K)

467 353-046N O O SCREW,DRAWING SPECIAL(3X8 BK.)

MODELS:(A)DV7511E6S(DVD6054) (B)DV7811E6S(DVD6184)

3. Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

OWNER'S MANUAL

CABLE DIN

810

CABLE ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS'Y 1WAY(YELLOW)

PLUG ASS'Y 2WAY

2-4

• Packing Accessory Section Part List

S AL LOCA.NO PART NO(LG) A B DESCRIPTION SPECIFICATION REMARKS

801 3835RS0063W O INSTRUCTION ASSEMBLY DVD DV7511E6S HA8PLL

801 3835RS0064A O INSTRUCTION ASSEMBLY DVD DV7811E6S HA8PLL

802 3890R-H803L O O BOX DV7511E6M HA8PLL SWW3-A 0.870

803 3920R-E066A O O PACKING,CASING DV7000 0.02 68 EPS 10 1165 238

804 292-053B O O BAG SOFT(MIDI) NSP

808 841-0021 O O BATTERY,MN ER03X HI WATT 1.5V .MA/H AAA

810 6851RP0003N O O CABLE ASSY,RF DVD CABLE ASSY,RCA USING AREA

811 6611R1G001A O O PLUG ASSY 1WAY YELLOW GLOBAL

812 6611R2G001A O O PLUG ASSY 2WAY RED/WHITE GLOBAL

900 6711R1P063A O O REMOTE CONTROLLER ASSEMBLY N6 UNIFIED DV7520E LG W/O DISC

MODELS:(A)DV7511E6S(DVD6054) (B)DV7811E6S(DVD6184)

3-1

SECTION 3

ELECTRICAL

CONTENTS

DVD PART ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

.................................. 3-2

1. System Clock X501 (27Mhz) ................................................................................................. 3-2

2. Initializing between MPEG and SDRAM .............................................................................. 3-2

3. Initializing between MPEG and Flash .................................................................................. 3-3

4. Reference Voltage 1............................................................................................................... 3-3

5. Reference Voltage 2............................................................................................................... 3-4

6. Checking the initial step of M/D Ass’y ................................................................................ 3-4

7. Checking the Video Signal ................................................................................................... 3-5

8. Checking the first step of servo (1) ..................................................................................... 3-5

9. Checking the second step of servo (2) ............................................................................... 3-6

10. Checking the output of Audio signal................................................................................. 3-6

11. Checking the reset port....................................................................................................... 3-7

12. Checking the focus & tracking servo ................................................................................ 3-7

13. Checking the track jump..................................................................................................... 3-8

14. The status of CD_LD and DVD_LD in the PLAY MODE ................................................... 3-8

15. The status Focus and spindle motor................................................................................. 3-9

16. DATA STREAM ..................................................................................................................... 3-9

17. Input Clock to IC202 .......................................................................................................... 3-10

18. Tray Open and Close......................................................................................................... 3-10

19. Focus Drive signal(FACT) ................................................................................................. 3-11

20. Signals for Front micom ................................................................................................... 3-11

21. FACT and FE for DVD9 (Dual disc) .................................................................................. 3-12

22. System clock of MPEG IC................................................................................................. 3-12

BLOCK DIAGRAMS ................................................................................................................ 3-13

1. DVD Overall Block Diagram................................................................................................ 3-13

2. SERVO Block Diagram........................................................................................................ 3-14

3. MPEG Block Diagram.......................................................................................................... 3-15

4. AUDIO Block Diagram......................................................................................................... 3-16

CIRCUIT DIAGRAMS.............................................................................................................. 3-17

1. POWER(SMPS) CIRCUIT DIAGRAM................................................................................... 3-17

2. RF SERVO CIRCUIT DIAGRAM........................................................................................... 3-19

3. SYSTEM CIRCUIT DIAGRAM .............................................................................................. 3-21

4. AUDIO & JACK CIRCUIT DIAGRAM................................................................................... 3-23

5. TIMER/5.1CH CIRCUIT DIAGRAM....................................................................................... 3-25

• CIRCUIT VOLTAGE CHART .................................................................................................. 3-27

PRINTED CIRCUIT DIAGRAMS.......................................................................................... 3-31

1. MAIN P.C.BOARD ................................................................................................................. 3-31

2. KEY P.C.BOARD................................................................................................................... 3-33

3. TIMER P.C.BOARD ............................................................................................................... 3-33

4. SCART P.C.BOARD.............................................................................................................. 3-35

4. POWER(SMPS P.C.BOARD ................................................................................................. 3-36

3-2

DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

1. System Clock X501 (27Mhz)

IC501

X501

MPEG (STI5589)

NORMAL

1) MPEG IC start oscilating after being installed VCC

ABNORMAL

1) Logo Picture doesn’t appear

2) Initial step fail * Initial step : power cord in -> green LED ->

red LED -> power key input -> Logo picture

6.5 Vp-p

X501 : 27 Mhz X501 : there is distortion

IC502 SDRAM

Front µ-com

X501

/M-RESET

SMI_CLK

L507

IC501 MPEG (STI5589)

1) MPEG IC start oscilating(27Mhz)after being installed VCC

2) MPEG IC and DSP IC get the /M - RESET signal from front µ-com and they are initialized.

3) And then, MPEG IC generate SMI_CLK and send to SDRAM

4) MPEG IC and SDRAM are synchronized by SMI_CLK, they communicate between.

If oscilation(27Mhz) don’t appear, check The X-TAL and VCC and replace MPEG IC.

If SMI_CLK don’t appear, first cut the SMI_CLK line (remove L507) and recheck. Don’t appear -> check MPEG IC or replace Appear -> check the SDRAM or replace

/M-RESET

Reset Time

Power Cord in

X501

(27 Mhz)

SMI_CLK

(133 Mhz)

2. Initializing between MPEG and SDRAM

3-3

IC503

Flash ROM

IC901 Front µ-com

X501 (27Mhz)

/M-RESET

VCC

data

address

IC501

MPEG (STI5589)

1) MPEG IC start oscilating(27Mhz) after being installed VCC

2) MPEG IC is initialized by /M - RESE T

3) MPEG IC send the WE(read/write) signal before communicating with FLASH ROM

WE signal should be confirmed by Flash or the next step will not continue.

As that result, the initial step(power cord in -> green LED -> red LED -> standby) will fail.

If WE signal doesn’t appear, check the VCC and replace the Flash ROM…

VCC

Power Cord in

/M-RESET

3. Initializing between MPEG and Flash

VCC (3.3V)

V-REFD (2.1V)

9 PIN

10 PIN

IC202

DSP (STL6316)

1) There is one kinds of reference voltage on DSP IC

2) These are outputed from DSP IC and 2.1V is used as reference of Pick - up

If these reference voltage don’t appear, All kinds of servo control will fail.

So, should be checked first of all Check the DSP

IC and replace…

3) The reference voltage of DSP is 1.65V for inside of IC L6316, but we can cheek the voltage only by TP.

TP211 is for tracking error and TP212 is for focusing error.

VCC

3.3V

2.1V

Power Cord in

VREF2

4. Reference Voltage 1

3-4

Pick-Up

TACT

A/B/C/D

Reference

2.1V

Reference

2.7V

IC201

DSP (MN103S)

IC201

Motor Drive

We can see how the reference voltage, mentioned previous page, will work on servo control..

1) The DC level of RF signal from P/up is 2.1V

2) The DC level of TE and FE is 1.65V

3) Correct DC level of these signal make servo work normally.

Even though, the reference voltage come out correctly from DSP,

If A/B/C/D are not biased by 2.1V, and checking the P/up is needed.

If the DC level of TE is not 1.65V, check DSP and replace it… In case of FE, procedure is same

1.65V

A/B/C/D

1.65V

2.1V

5. Reference Voltage 2

-SW

LIMIT

-SW

PMD01 PMD02

FM+

LD-CD

Q203

IC202

DSP

M/D ASSY

IC201 Motor Drive

PMD03

Let’s look over the initial action of M/D...

1) When the tray is closed, CLOSE-SW should be changed from 5V to 0V and DSP need to detect this change

2) Feeding Motor move the P/up to inner area until the LIMIT SW is detected

3) After DSP detect the LIMIT SW, DVD laser is

turned on and go to the next step

4) if there is a DISC on the tray, the RF will be detected by the DVD laser and go to next step..

Check the CLOSE-SW and LIMIT-SW

if anything of the both is not detected, the next step won’t go on. This means that even though there is a DISC on the tray the DISC will not rotate.

FM+

CLOSE-SW

P/up move to inner area

Limit sw

detect

DVD LD on

Tray close

LIMIT-SW

DVD-LD

6. Checking the initial step of M/D Ass’y

3-5

Check the followings

1) Check the video output mode. if the output mdoe is progressive - on, there is no composite signal. the output mode should be changed to progressive - off

2) Check the buffer IC and MPEG, and then replace.

175 Ohm

Composite out

34 pin

IC403

23Pin

STI5589 (MPEG)

buffer

DC 0V

15.7 Khz

DC0.3V

31.3 Khz

Composite signal is normal --> Screen display OK Composite signal is abnormal -->there is no screen on TV

7. Checking the Video Signal

IC501 MPEG

DSP-RST

PC[o]

IC202

DSP IC

IC203 MOTOR AMP IC

Let’s look over the initial step of DSP

1) First. DSP IC receive the DSP - Reset from MPEG

2) This reset signal get DSP initialized and DSP is ready to do first step for servo

3) PC[o] from DSP is the test signal for checking the PLL- loop

4) after checking the PLL-loop, the second step is followed. the second step will be explained on next page…..

if PC[o] doesn’t appear, check DSP and

replace.

/DSP-Reset

Vcc(3.3V)

50ms

DSP Reset period

PC[o]

8. Checking the first step of servo (1)

3-6

M/D ASSY

LD-DVD

PMD03

IC202 DSP

Let’s look over the initial step of servo

1) when the tray is closed, first of all, it should be checked whether there is disc or not on tray

2) DVD laser is turn on and the lense is moved. if there is a disc on tray, RF signal will appear

3) next, it should be confirmed which disc is that. CD or DVD.

4) the following step will be done continuously DVD -Laser on -> move up/down in according to disc type, there will be RF signal…

5) after confirming disc, CD or DVD laser turn on and focus servo is executed…

the below picture is related signals when CD disc is inserted

DVD laser on

CD laser on

PI CD/DVD

LD-DVD

LD-CD

9. Checking the second step of servo (2)

DAC_PCMOUT

IC402 OPAMP

DAC_PCM_CLK

DAC_SCLK DAC_LRCK

Analog audio

IC501

MPEG (STI5589)

AUDIO DAC (PCM1742)

IC401 is called as Audio DAC, DAC means DigitalAnalog Convertor.

This IC receives digital signal from MPEG and convert digital signal to analog signal, so we can hear sound…

IC401 is connected with OP - AMP and an analog Audio signal is amplified at the OP - A MP. because the analog audio signal from DAC is a very low level.

DAC_PCM_CLK : this is the system clock for

IC401

DAC_SCLK : this is standard clock to synchronize

the audio serial data

DAC_LRCK : R-chanel and L-chanel are selected

among the audio serial data by this

DAC_PCMOUT3 : serial audio data

DA_XCK

DA_BCK

DA_LRCK

DA_DATA

10. Checking the output of Audio signal

3-7

Pin 81 of IC202, pin 124, 186 of IC501 and pin 12 of IC503 are related to RESET.

We can know whether IC is intialized or not through those ports.

The waveform shows the status when the reset signal works normally.

If the /M-RESET is abnormal, then check the front u-com(IC901) and replace it

/M-RESET (Pin124 of IC501)

DSP_RST (Pin 81 of IC202)

3.3V power input

The waveform when power on

11. Checking the reset port

Waveforms as below are regarding focusing and tracking servo normally. FE and TE signal are generated in IC202 and output at pin55, pin54 of IC202,(TP212, TP211) respectively.

IC202 Pin55

(TP212)

TE(TP211)

IC202 Pin54

12. Checking the focus & tracking servo

3-8

TE and TACT signals are output respectively from pin 54 and pin 34 of IC 202 during a normal play.

SLED signal is output pin 29 of IC 202 and flow into pin 15 and pin 18 of IC 201 to operate a sled motor when to skip chapters or to scan.

IC202

pin34

IC202

pin54

IC202

pin29

IC202

pin34

IC202

pin54

IC202

pin29

The waveform during a normal play The waveform when to skip or scan

13. Checking the track jump

This is the waveform of FE and collector outputs of Q205 and Q206 when to play DVD

This is the waveform of FE and collector outputs of Q205 and Q206 when to play CD

The waveforms as below indicate “COLLECTOR” outputs of Q205 and Q206, respectively when to play DVD and CD

IC202 pin55 (TP212)

Q206 COLLECTOR

Q205 COLLECTOR

IC202 pin115

Q206 COLLECTOR

Q205 COLLECTOR

14. The status of CD_LD and DVD_LD in the PLAY MODE

DVD LD ON

DVD LD OFF CD LD ON

3-9

The waveform is to display F+ signal from pin 9 IC201 and SPM+ from pin 10 IC201.

F+ is used to control a focus actuator of pick - up and SPM+ is used to operate a spindle motor. So, we can know the position of the acuator and the speed and rotating direction of the spindle motor through those signals.

IC201 pin 9

IC202 pin 28

The waveform F+ and SPM+ in the PLAY Mode

15. The status Focus and spindle motor

This waveforms are showing “The Downloading serve program”.

The must important thein of the download process is the timing.

The servo program must be downloaded before the second DSP reset.

DSP_Reset(IC501 pin186 to IC202 pin81)

/MRESET

IIC_DATA(IC501 pin194 to IC202 pin69)

DSP_Reset active Low

IIC_CK(IC501 pin195 to IC202 pin68)

16. DATA STREAM

+ 39 hidden pages