LG DRD-8080B Service Manual

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

• IBM Compatible Pentium 133MHz or Above (with PIO mode 4, TX chip set recommended)

2. SUPPORTED OS

3. GENERAL PERFORMANCE

• Data Transfer Rate ...........................................................................................Sustained Data Transfer Rate

DVD (Outer side) : Approx. 10,800 kbytes/sec DVD (Inner side) : Approx. 4,725 kbytes/sec CD (Outer side) : Approx. 6,000 kbytes/sec CD (Inner side) : Approx. 2,625 kbytes/sec

• Data Buffer Capacity.......................................................................................................................512 kbytes

• Access Time...................................................................Random Access DVD : 120ms Typical (8X)

CD : 100ms Typical (40X)

4. POWER REQUIREMENTS

• Voltage ........................................................................................................................................+5V DC +5%

+12V DC +5%

• Ripple .....................................................................................................................................+5V : 100mVp-p

+12V : 100mVp-p

• Current .........................................................................................+12V : 400mA (Average), 0.9A (Maximum)

+5V : 500mA (Average), 1.2A (Maximum)

5. AUDIO PERFORMANCE

• Frequency Response......................................................................................................20Hz~20KHz(+ 3dB)

• S/N Ratio (IHF-A+20kHZ LPF) ..........................................................................88 dB (Typical at 1 KHz 0dB)

80 dB (Limit at 1 KHz 0dB)

• T.H.D. (IHF-A+20kHZ LPF)...............................................................................0.05% (Typical at 1 KHz 0dB)

0.15% (Limit at 1 KHz 0dB)

• Channel Separation (IHF-A+20kHZ LPF) .................................................................................75 dB(Typical)

70 dB(Limit)

• Output Voltage (1kHz 0dB) 47KΩ Load ..................................................................................0.8Vrms +20%

• Headphone Level (1kHz 0dB) 33Ω Load.................................................................................0.8Vrms +20%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight DVD-ROM Drive

• 120ms (Typical) Random Access Time (DVD)

• 100ms (Typical) Random Access Time (CD)

• Supports 8X (max) Rotational Modes in DVD Mode

• Supports 40X (max) Rotational Modes in CD Mode

• Max 10,800 kB/sec Sustained Transfer rate in DVD mode

• Max 6,000 kB/sec Sustained Transfer rate in CD mode

• Photo-CD Multisession Disc Spec compliant

• Multimedia MPC-3 Spec compliant

• Power Tray Loading/Ejection Mechanism

• 3-Way Eject Support (Software, Open/Close Button,

Emergency Eject)

• Closed Enclosure

• Built-in ATAPI Interface Controller

• Software Volume Control

• Easy CD-Audio Play front panel Controls

• Front panel Volume Control for Headphone Output

• Built-in MODE-1 ECC/EDC

• MTBF (125,000H) POH (at 10% Utilization)

• PIO Mode 4 & Multiword DMA Mode 2 Support

• ULTRA DMA 33 support

• Horizontal/Vertical Mounting

• Digital audio output connector

• Digital audio through ATAPI Interface

• Spin-down Mode for energy saving

• MS-DOS (Ver 3.1 or Higher)

• Windows 3.1/95/98/2000

• Windows NT (Ver 4.0)

• OS/2 Warp (Ver 3.0)

• Solaris (Ver 2.4 or Higher)

• Linux ’96 Slacware (Ver 3.1.0)

This service manual provides a variety of service information. It contains the mechanical structure of the DVD-ROM Drive together with mechanical adjustments and the electronic circuits in schematic

form. This DVD-ROM Drive was manufactured and assembled under our strict quality control standards and meets or exceeds industry specifications and standards.

LOCATION OF CUSTOMER CONTROLS

(1) Digital Audio Ouput Connector

This is a digital audio output or Video CD output connector. You can connect this to a digital audio system or a Video CD Board.

(2) Analog Audio Output Connector

The Audio Output Connector connects to a sound card.

(3) Master/Slave/CSEL Jumper

These three jumpers are used to set the DVD-ROM Drive to either a Master, Slave, or CSEL device.

(4) Interface Connector

This 40-pin connector is used to transfer data and control signals between the DVD-ROM Drive and your PC.

(5) Power-in Connector

Attach a power cable from the computer to this connector.

COMPACT

ROM

5 6

DIGITAL ANALOG

INTERFACE POWER

DR CSM

SLA

GLG39

+12

GND

AUDIO AUDIO

FRONT VIEW

BACK VIEW

(1) Headphone Jack

Standard

″

(3.5mm) stereo jack for listening to the

audio signal from audio CDs.

(2) Headphone Volume Control

Adjusts the headphone sound level.

(3) Disc Drawer

Accepts a CD-ROM/DVD-ROM disc on its tray.

(4) Busy Indicator

The Busy Indicator lights during initialization and dataread operations.

(5) Emergency Eject Hole

Insert a paper clip here to eject the drawer manually or when there is no power.

(6) Open/Close/Stop Button

This button is pressed to open or close the CD tray. If an audio CD is playing, pressing this button will stop it, and pressing it again will open the tray.

1. CABINET and CIRCUIT BOARD DISASSEMBLY

1-1. Bottom Mecha

A. Release 4 screws (A) and remove the Bottom Mecha

in the direction of arrow (1). (See Fig.1-1)

1-2. Front Bezel Assy

A. Insert and press a rod in the Emergency Eject

Hole and then the CD Tray will open in the direction of arrow (2).

B. Remove the Tray Door in the direction of arrow

(3) by pushing the stoppers forward.

C. Release 3 stoppers and remove the Front Bezel Assy.

1-3. Cabinet and Main Circuit Board

A. Remove the Cabinet in the direction of arrow (4).

(See Fig. 1-3)

B. Remove the CD Tray drawing forward, by pushing

the Hook(a) backward(5).

C. Remove the Main Circuit Board in the direction of

arrow (6).

D. At this time, be careful not to damage the 4

connectors, are positioned at side, of the Main Circuit Board.

2. DECK ASSY DISASSEMBLY

2-1. Base Assy

A. Release 1 screw (C) and 2 Stoppers (D). B. Separate the Base Assy in the direction of arrow (7). C. Remove the Frame Assy Up/Dowm.

(3)

(2)

Tray Door

Stoppers

CD Tray

Emergency Eject Hole

Front Bezel Assy

Fig. 1-1

DISASSEMBLY

(4)

(5)

(6)

Hook (a)

Cabinet

Main

Circuit Board

Fig. 1-3

Fig. 1-2

(8)

(7)

Mechanism Assy

(C)

(D)

Base Assy

Frame Assy Up/Down

Fig. 1-4

(1)

(A)

Bottom Mecha

(A)

2-2. Pick-up Unit

A. Remove the skew spring. B. Remove the Pick-up Unit.

2-3. Feeding Motor Assy

A. Remove the Feeding Motor Assy by pushing the 2

hooks(b).

B. At this time, be careful the hooks of the Base Pick-up.

Skew Spring

Pick-up Unit

Fig. 1-5

Base Pick-up

Feeding Motor Assy

Fig. 1-6

INTERNAL STRUCTURE OF THE PICK-UP

1. Structure of the Pick-Up

C001

C002

CN14 DVD PD VCC CN10 DVD PD VC CN15 DVD PD GND

CN8 DVD A CN9 DVD B

CN11 DVD C

CN12 DVD D

CN7 DVD RF

CN13 DVD E

CN5 DVD F

CN19 DVD VR

CN18 DVD MD CN16 DVD LD

CN15 DVD LD GND

CN1 FO+ CN2 FO-

CN3 TR+

CN4 TR-

CN30 CD VCC

CN20 CD VC

CN26 CD GND CN25 CD A

CN28 CD B

CN23 CD C CN24 CD E

CN29 CD F

CN21 CD VR

CN22 CD MD CN27 CD LD

C010

C011

C012

VR02

U002

U001

TRACKING

FOCUS

C004

ACTUATOR

VR01

LASER DIODE

PICK UNIT

1) Focus Error Signal –> (A + C) - (B+C)

• In case of CD Disc This signal is generated in RF AMP IC (IC301 : SSI3723) and controls the pick-up’s up and down to focus on CD Disc.

2) Tracking Error Signal (3-Beam Method) –> F - E

• In case of CD Disc This signal is generated in RF AMP IC (IC301 : SSI3723) and controls the pick-up’s left and right shift to find the track on CD Disc.

3) RF Signal –> A+B+2C

• In case of CD Disc This signal is converted to DATA signal in DSP IC (IC701 : CXD3030R).

2. Structure of the Photo Diode (CD)

Infrared laser

Pick-Up module

Photo Diode

Tracking

Focusing

(As seen from light

receiving side)

1) Focus Error Signal –> (A+C) - (B+D)

• In case of DVD Disc This signal is generated in RF AMP IC (IC301 : SSI3723) and controls the pick-up’s up and down to

focus on DVD Disc.

2) Tracking Error Signal (DPD Method) –> Differential phase of (A+C) and (B+D)

• In case of DVD Disc This signal is generated in RF AMP IC (IC301 : SSI3723) and controls the pick-up’s left and right shift to find the track on DVD Disc.

3) RF Signal –> A+B+C+D

• In case of DVD Disc This signal is converted to DATA signal in DSP IC (IC201 : CXD1867R).

3. Structure of the Photo Diode (DVD)

(As seen from light

receiving side)

Red laser

Pick-Up module

Photo Diode

Tracking

Focusing

D C

B A

PN301

R317

R318

C332

C335

Q302

C331

C333

CD LD

CD PD

DVD LD

IC301 SSI3723

DVD PD

Q303

R315

R316

Vcc

DVD MD DVD-

DVD LD

CD PD

CD-VR

CD LD

DVD-LD(LASER DIODE)

CD-LD(LASER DIODE)

PICK-UP Unit

Monitor Diode

1-2. APC Circuit Operation

It drives the LD to the constant current and adjusts the LD input current , so that the output current is constant. IC301 (SSI3723) Pin , : PD IN, Monitor Input of Laser diode APC IC301 (SSI3723) Pin , : LD OUT, External Current Driver Control output of the LD (Laser Diode)

The detect current from the monitor diode converts to the I/V (Current/Voltage) at the external resistor. Beforehand, it adjusts a fixed level over for a standard GND. If this voltage inputs to the PD IN (IC301 Pin 23, 24), it is amplified about 36.4 times (about 31.2dB). So this voltage outputs from the LD OUT (IC301 Pin 21, 22).

The LD driving element (Q302/Q303) uses the TR more than 200hfe, and controls LD OUT (IC301 Pin 21,

22) connected to the base of Q302/Q303. The APC control for the each DVD/CD sets Register of the IC301 (SSI3723) according to Disc in the µ-COM.

DESCRIPTION OF CIRCUIT

1. APC (Automatic Power Control) Circuit

1-1. APC Circuit Constitution

D C B A

25 28

8 9

CD (A, B, C)

DVD RF

17 18

11 12

AMP

MUX

ATT

AGC

GCA

SUM AMP

BUFF

MUX

RF AC

To IC701 38

To IC701 36

To IC701 47

To IC202 117

GCA

Phase Detector

DVD (A, B, C, D)

DVD (A

, B2, C2, D2)

CD (E, F)

Pick-up Unit

PN301

IC301

SSI3723

RF DC

RF SIN

2. RF Amplifier Circuit

2-1. RF AMP Constitution

FOCUS & TRACKING SERVO PROCESS

SLED(Feed) SERVO PROCESS

D C B A

Pick - Up

IC301

RF AMP SSI3723

E-F

(A. B. C. E. F)

DVD (A. B. C. D.)

TE/ DPD TE

SELECTOR

Generating

DPD TE

Generating

FOCUS ERROR DETECTOR

FOCUS & TRACKING

ACTUATOR

IC501

DRIVE BA5983FM

IC701

CD/DVD SERVO & DSP CXD3030R

F+ F-T+ T-

LEVEL SHIFT

FAO

TAO

D/A

DIGITAL

EQUALIZER

(AUTO ADJUSTMENT CIRCUIT)

SLED

Control

Signal

A/D

TE FE

SAO

SLED MOTOR

Hall Sensor

PHO - C

PHO - A

FEED. MOTOR+

FEED. MOTOR-

LEVEL SHIFT

IC501

Q501

DRIVE BA5983FM

KTD1304

IC201

u-COM

SLGNCHG

SLED CLK

(A. B. C)

(A. B. C.D)

. B2. C2 .D2)

3. Focus/Tracking/Sled Servo Circuit

3-1. FOCUS, TRACKING & SLED SERVO PROCESS

3-2. Focus Servo for CD/DVD

Focus Servo for CD/DVD is based on focus error signal generated from RF AMP (SSI3723). It standardizes the laser beam (CD : A, B,C, DVD : A, B,C,D) radiated from the pick-up. Each other focus gain or path is made at the SSI3723 (IC301) according to the disc, Focus Error signal output from the FE terminal and input to Servo IC (IC701 CXD3030R). After the first amplification of this signal, the signal is converted to A/D and input to Digital Equalizer Block assigned the most important part at the Focus Servo, and generates the focus servo with coefficient value set at the µ-COM through the Digital Filter. At this Digital Equalizer, auto adjustment for Focus Balance or Focus Loop Gain occurs and the basic offset value for pick-up is accepted on the balance mode, and set the focus standard level to this value. After the signal for Focus Servo is converted to the D/A and output through FAO (IC701 CXD3030R ). This signal drives Focus Actuator through the Focus Drive IC (IC501:BA5983FM).

3-3. Tracking Servo for CD/DVD

For Tracking Servo, CD uses 3 Beam method (E-F), DVD uses DPD (Differential Phase Detect) method [Phase (A+C) - Phase (B+D)] According to the disc, Tracking Error is set at SSI3723, Gain or Path differs from each other, and the generated signal output through the TE terminal. This signal input to TE of IC701, after the first amplification, and converted to A/D. The signal converted to A/D input to the Digital Equalizer assigned the most important part at the Tracking Servo, Tracking Servo Gain is generated with Digital Filter coefficient value set according to the disc at the µ-COM.

* Tracking signal is converted to D/A through the pin TAO terminal of IC701 and input to IC501

(BA5983) tracking drive. This drive drives the tracking actuator actually.

3-4. Sled Servo (Feed Servo) for CD/DVD

Sled servo operates related with a tracking servo basically It goes with the progressive track speed according to the disc rotation speed. Sled drive voltage is generated with a accumulated capacity of tracking error signal and is applied sled movement voltage according to the track movement capacity, and this voltage outputs to the pin FAO of IC701. This value is the sled motor drove by the IC501 (Sled drive : BA5983FM). But, the shift speed for pick-up is not controlled and broke with a only sled servo, itself, in the data access mode, and the feedback is used according to the sled shift speed at this time. So, the accurated shift speed for pick-up is controlled added to the sled signal. The hall sensor is used in the feedback and SLEDCLK (95) output at the µ-COM (IC203) is used with it in the sled kick or break.

113

E A B

PICK-UP

SPINDLE MOTOR

A+B+2C

CD RF

DVD RF

A+B+C+D

IC203

IC701

PLL BLOCK

DVD RF

CD RF

Motor

Hall Sensor

HU+ HUHV+ HVHW+ HW-

Speed Monitoring

u-com

CD/DVD SERVO & DSP CXD3030R

IC301

RF AMP

SSI3723

IC201

DVD DSP CXD 1867R

IC401

DRIVE BA6664FM

SPINDLE SERVO PROCESS

LEVEL SHIFT

A, B, 2C

A, B, C, D

D C

MDP CD

SPDG0 SPDG1

4. Spindle Servo Circuit

4-1. SPINDLE SERVO PROCESS

4-2. Spindle Servo for CD/DVD

DRD-8080B consists of the three spindle control respectively. (1) DVD x 8 : CAV (DVD Single, Dual Layer) (2) CD x 16 (max.) : CAV (CD-DA, CD-RW(8-20 x), Video-CD(8x CLV), Host command stand-by of CDROM and CD-R) (3) CD x 40 (max.) : CAV (CD-R, CD-ROM play mode) In the spindle speed control mode respectively. CD x 16(Max)/CD x 40(Max) CAV drives CAV servo with PLL of RF data read and received MDP. (Pin 12 of IC701) DVD x 8 (Max) CAV drives CAV servo with FG signal and received MDP CD. (Pin 12 of IC701)

DESCRIPTION OF DATA PROCESSING

1. CD Data Processing Flow

Pickup

Unit

Motor

Drive

Generating

A/B/2C/E/F Signal

H8/3062

Buffer

CD Data Buffering

CXD1867R

CD-ROM Decoder

and Host Interface

CXD 3030R

CD DSP

SSI3723 RF

Signal processing IC

CD TE/FE/SLED

Spindle Control

Command

Data

Status

SDATA

CD DATA

CD RF

MA [0..8]

MDB [0..F]

DATA [0..7]

ADR [0..8]

SICLK

SIXLT

SIDAT

SCLK

CD Data ECC

Receive the order from Host

2'nd ECC

CD Data Buffering

Generating RF Signal

Generating Tracking Error

Generating Focusing Error

CD Servo Control

CD Data Flow Control

Host Command Receive or Data/Status Transfer

Error Correction

Generating Header Sync

Generating Subcode Sync

EFM Demodulation

2. DVD Data Processing Flow

DVD

Pickup

Unit

Motor

Drive

DVD

TE/FE/Sled/

Spindle control

Sled Control

CXD 3030R

CD DSP

H8/3062

Buffer

CXD1867R

DVD DSP

Command

Data/

Status

DVD RF

DATA [0..7]

ADR [0..8]

MA [0..8]

MDB [0..F]

Generating

A/B/E/F Signal

SSI3723 RF

Signal processing IC

Generating RF Signal

Generating Tracking Error

Generating Focusing Error

Error Signal

Receive the Command from Host

DVD Data Buffering

Copy Protection Control

DVD Data Buffering

DVD Servo Control

DVD Data Flow Control

Host Command Receive or Data/Status transfer

EDC + ECC processing

Generating DVD ID Sync

EFM Demodulation

CXD 1867R

HOST DVD

PLAYER

(MPEG2 B/D)

H8/3062

Scrambled MPEG Data

Change the "KEY"

KEY Management Control

3. Copy Protection and Regional Code Management Block

Block Diagram

Brief Process

1. Regional Code for DVD Disc

– DVD-ROM drive transfers the regional code of the control data to host by the command of host, the DVD

player of host reads the regional code, and plays title in the case of allowed regional code only.

2. Management of DVD Disc for the scrambled of data

(1) DVD-ROM and DVD player of host generate the “KEY 1” respectively, transfer to opposite part, the

“KEY 2” is received, recognizes the data transfer or not with this value, and generates the bus key

encoded the data. (2) Encoded “Disc Key” and “Title Key” host is transfer with the bus Key. (3) DVD player of host reads the key value, and uses the value to restore the scrambled data.

* Refer to the next page for the details.

4. About Prevention the DVD-ROM from to be copy

A data is able to encode and record in the disc, if a copyright holder wants to prevent the disc from copying.

In case of a disc enhanced movie of 3 titles......

DISC KEY (2048 Bytes) is used to encode the whole contents in the disc and TITLE KEY (5 Bytes) is used to encode the title respectively. So, the data is encoded and stored in a disc through the unknown algorithms with a disc key and title key. (At this time, the disc key and title key are stored in a disc.)

…As above, the disc is able to copy when the disc key and title key are

opened. Then, ROM-DRIVE encodes the disc key and title key and transfers to MPEG2 board.

If you want to play the disc prevented from the copy......

First of all, ROM-DRIVE and MPEG-2 board identify with each other through the procedure as described below.

1. Drive and host gives and takes the ID of 2bit. This ID is AGID (Authentication Grant ID). The various decoder boards are attached to the host, in these, AGID sets the MPEG-2 board and drive.

2. After the AGID is set, MPEG-2 board generates the challenge key (10 Byte) and transfers to drive. The board and drive generate key 1 (5Byte) with the challenge key respectively. (Of course, the Algorithm generating the key 1 is not known.)

3. Compare with the generated key 1, if it corresponds each other, the first step of authentication is completed. This is a course to identify the MPEG-2 board with a drive.

4. The second step of authentication is a course to identify a drive with the MPEG-2 board. The dirve generates a challenge key and transfers it to the MPEG-2 board. The dirve and MPEG-2 board generate the key 2 (5Byte) with the challenge key, compare with each other, and if it corresponds and the secondary step of authentication is completed.

5. As above, the identification is completed.

6. The dirve and MPEG-2 board generate the Bus key with the key 1 and key 2 and own it.

7. Dirve encodes the disc key and title key with this Bus key and transfers to the MPEG-2 board.

8. The MPEG-2 board reads the encoded disc key and title key with the Bus key only.

9. MPEG-2 board lets data read from the drive to decode with the read disc key and title key and makes into the video signal by decoding.

ROM-DRIVE

AGID

HOST

MPEG-2 BOARD

Challenge key

encoded disc key, title key

+ 35 hidden pages

LG DRD-8080B Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual