Zenith DVB-318 Service manual

SERVICE MANUAL

Product Type: DVD VIDEO PLAYER
Chassis: DP7 (MD)
Manual Series: DVB318
Manual Part #: 3829RHN004A
Model Line: D
Product Year: 2003

Summary  1
Cabinet & Main Chassis 2
Electrical 3
Mechaunism 4
Parts List 5

Published September 2003

by Technical Publications

Zenith Electronics Corporation

201 James Record Road

Huntsville, Alabama 35824-1513

Copyright © 2003 by Zenith Electronics Corporation

Printed in U.S.A

Model Series:

CONTENTS

DVB318

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1-1

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 Zenith 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 Zenith 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 120 V , 60 Hz

Power consumption 14W

Dimensions (Approx.) 430 x 48 x 242 mm (16.9 x 1.9 x 9.5 inches) (W x H x D)

Weight (Approx.) 2.34 kg (5.2 lbs)

Operating temperature 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity 5 % to 90 %

• SYSTEM

Laser Semiconductor laser

Signal system NTSC

Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz

DVD (PCM 48 kHz): 8 Hz to 22 kHz

CD: 8 Hz to 20 kHz

Signal-to-noise ratio More than 100 dB (ANALOG OUT connectors only)

Harmonic distortion Less than 0.008%

Dynamic range More than 90 dB (DVD/CD)

• OUTPUTS

VIDEO OUT 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1

S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1

(C) 0.3 V (p-p) 75 Ω

COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1

(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2 (480p, 720p, 1080i)

DVI-D DIGITAL OUT DVI-D Single Link connector x 1 (480p, 720p, 1080i)

Digital Audio output (Coaxial) 0.5 V (p-p), 75 Ω, RCA jack x 1

Digital Audio output (Optical) 3.0 V (p-p), 75 Ω, Optical connector x 1

Analog Audio output 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1

• ACCESSORIES

Component video cable 1

DVI-type cable 1

S-Video cable 1

Video cable 1

Audio cable 1

Remote control 1

Batteries 2

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

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

463

463

250

A00

463

463

300

283

280

A47

A47A

A48

A44

A43

A50

A46

260

261

261

463

320

463

467

463

465

452

SCART&5.1CH
MODEL
ONLY

OPTIONAL PART

A

5

4

3

2

1

BCD

2-3

2. 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))

814

CABLE, COAXIAL

(DVI CABLE MOLEX)

815

CABLE, COAXIAL

(3WAY RCA COMPONENT)

PLUG ASS'Y(2WAY)

3-1

SECTION 3

ELECTRICAL

CONTENTS

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(FLI2301B) and Flash ...................................................................3-3

4. Sil170B is nitialized by M-Reset and D-Reset ........................................................................3-3

5. Reference Voltage 1 ..................................................................................................................3-3

6. Reference Voltage 2 ..................................................................................................................3-4

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

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

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

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

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

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

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

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

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

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

17. DATA STREAM.........................................................................................................................3-9

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

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

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

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

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

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

24. 480P ........................................................................................................................................3-13

25. 720P ........................................................................................................................................3-13

26. 1080i .......................................................................................................................................3-14

BLOCK DIAGRAMS ................................................................................................................ 3-15

1. DVD Overall Block Diagram ...................................................................................................3-15

2. POWER Block Diagram ..........................................................................................................3-16

3. SERVO Block Diagram............................................................................................................3-17

4. MPEG Block Diagram .............................................................................................................3-18

5. GENESIS & DVI BLOCK Diagram ..........................................................................................3-19

6. AUDIO Block Diagram.............................................................................................................3-20

CIRCUIT DIAGRAMS.............................................................................................................. 3-21

1. Power(SMPS) Circuit DIAGRAM ............................................................................................3-21

2. RF & SERVO Circuit DIAGRAM..............................................................................................3-23

3. SYSTEM Circuit DIAGRAM.....................................................................................................3-25

4. AUDIO & JACK Circuit DIAGRAM..........................................................................................3-27

5. Timer/5.1CH Circuit DIAGRAM...............................................................................................3-29

6. DVI Circuit DIAGRAM..............................................................................................................3-31

• CIRCUIT VOLTAGE CHART......................................................................................................3-33

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

1. MAIN P.C.BOARD (TOP VIEW) ...............................................................................................3-39

2. MAIN P.C.BOARD (BOTTOM VIEW) .......................................................................................3-41

3. KEY P.C.BOARD ......................................................................................................................3-43

4. TIMER P.C.BOARD ..................................................................................................................3-43

5. POWER(SMPS) P.C.BOARD ...................................................................................................3-45

6. DVI P.C.BOARD........................................................................................................................3-46

3-2

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

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 ->

OFF -> 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

1. System Clock X501 (27Mhz)

3-3

IC901
Front
µ-com

IC601
FLI2301

IC603
Sil170B

IC501
MPEG

IC503
Flash
ROM

X501(27Mhz)

D-ResetM-Reset

X601(13.5Mhz)

M-Reset WE

data

address

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

2) MPEG IC & FLI2301is 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 -> off -> standby) will fail.

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

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

M-reset

D-reset

X-601 clk

3. Initializing between MPEG(FLI2301B) and Flash

4. Sil170B is nitialized by M-Reset and D-Reset

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

5. 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

FE

1.65V

TE

A/B/C/D

1.65V

2.1V

6. Reference Voltage 2

CLOSE

-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

7. 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

8. Checking the Video Signal

81

82

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]

9. 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

4)

10. 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

11. 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

12. 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.

FE

IC202 Pin55

(TP212)

TE(TP211)

IC202 Pin54

13. 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

14. 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

15. 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

16. 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)

17. DATA STREAM

3-10

C244

C245

R237

R271

86 87

IC202

X201

The waveform and the block diagram as below show a clock input and output between IC202 and X201.

Clocks generated in X201 is output and input into pin86 and pin87 of IC202.

The clock frequency is 20MHz.

IC 202

pin86

IC 202

pin87

A diagram for a colck input of IC201 The waveform of clock inputs to IC201

18. Input Clock to IC202

IC202

DSP

IC201

Driver IC

Pin 38

Pin 39

Pin 1

Pin 2

Tray-open

Tray-close

MD

Pin 4

Pin 5

LM-

LM+

DSP send tray - open or tray - close signal to IC201(motor drive IC)

IC201 generates LM+ and LM - and transmits them to operate a loading motor.

if there is no LM+ or LM-, check the Tray-open and Tray-close. And replace the Motor Drive IC .

IC201

pin1

IC201

pin2

A signal flow for tray open and close The waveform input to IC201 for tray open and close

19. Tray Open and Close

3-11

IC202

IC201

Driver IC

Pin23

Pin24

Pin133 Pick-up

F-

F+

Pin8

Pin9

FACT

FACT is made from focus error signal at DSP(IC202) and is input to IC201.

And then FACT is converted into F - and F+ in IC201.

Finally, they are sent to pick - up to control a focus actuator.

IC202

pin33

IC201

pin8

IC201

pin9

A signal flow for FACT The waveform of FACT, F- and F+

20. Focus Drive signal(FACT)

MRESET signal is output from front µ-COM when power is on, so IC501 is initialized.

And those(front µ-COM and IC501) communicate each other through SCKO, TXDO, RXDO signals

Waveforms display each signal when power on and after power on

IC501

pin207

IC501

pin1

IC501

pin208

IC501

pin124

SCKO

TXDO

RXDO

MRESET

IC501

pin207

IC501

pin1

IC501

pin208

IC501

pin124

The waveform when power is on The waveform after power on

21. Signals for Front micom

3-12

FE signal becomes like the waveform 2, in case of DVD dual layer disc since the laser

beam is reflected on both layer 0 and layer 1.

Layer0 Layer1

A

22. FACT and FE for DVD9 (Dual disc)

L508

IC506
Buffer IC

IC501

C542

C541

R500

The waveform and the block diagram as below show a clock input and output between IC501 and X501.

Clocks generated in X501 is output and input into pin120 of IC501.

The clock frequency is 27MHz.

If this clock is abnormal or does not appear, replace the X-tal or MPEG IC

IC501

pin120

A diagram for a colck input of IC501 MPEG CLOCK

23. System clock of MPEG IC