LG DRN-8040B Service Manual

1. SUPPORTED SYSTEM

• IBM Compatible Pentium 133MHz or Above • MPEG II Board or Software MPEG II Program

2. SUPPORTED OS

3. GENERAL PERFORMANCE

• Rotational Speed........................................................DVD : 2X~4X (CAV) Approx. 2,500 to 2,850 rpm

(single & dual layer)

CD-ROM : 10X~24X (CAV) Approx. 4,650~5,000rpm

• Data Transfer Rate

* Sustained Data Transfer Rate................................DVD(Outer side) : Approx. 5,408kbytes/sec

DVD (Inner side) : Approx. 2,704kbytes/sec CD (Outer side) : Approx. 3,600kbytes/sec CD (Inner side) : Approx. 1,551kbytes/sec

* Burst (ATAPI) .........................................................16.67 Mbytes/sec (PIO Mode 4)

16.67 Mbytes/sec (Muliword DMA Mode 2)

• Access Time (Including Latency)

* Random Access*1..................................................DVD : 180ms Typical (2X~4X)

CD : 130ms Typical (10X~24X)

* Full Access (First to Last Block)*2..........................DVD : 360ms Typical (2X~4X)

CD : 280ms Typical (10X~24X) Notes : *1 : Average Random Seek time is the typical value of more than 100times including latency and error

correction time.

*2 : Average Seek time is the typical value of more than 100times including latency and error correction

time.

Test Disc : a CD : A-BEX TCDR-701

b DVD : A-BEX TDV-520 or TEAC MDVD411/MDVD-191or TDR-820

• Data Buffer Capacity .................................................. 256Kbytes

• ATAPI interface

• Ultra Slim type DVD-ROM drive. (Height : 12.7 mm)

• Ability to read single sided, single layer, or dual layer DVD media

• DVD-5, DVD-9, DVD-10 Capable

• Sustained Transfer Rate 5410 KB/S (Max.) DVD media & 3600 KB/S (Max.) CD-ROM Media

• (180)ms Average Access time in DVD mode

• (130)ms Average Access time in CD mode

• Support 4x(Max.) Rotational Modes in DVD mode

• Support 24x(Max.) Rotational Modes in CD mode

• CD-R read capability

• Drawer load

• MPC level 3 compatible

• Photo CD : Single and Multisession support

• XA ready

• Subcode Q

• Red Book Audio

• Analog Line out

• Digital Audio through Atapi interface

• Energy conservation modes

• Horizontal/Vertical operation

• MS-DOS (Ver 3.1 or Higher)

• Windows 3.1/95/98 Higher

• Windows NT (Ver 3.5, Ver 4.0) or Higher

• OS/2 Warp (Ver 3.0 & 4.0) or Higher

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

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

4. POWER REQUIREMENTS

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

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

• Seek ..........................................................................1300mA Max, 960mA Typical

• Normal Read ..............................................................800mA Max, 750mA Typical

• Standby & sleep .........................................................40mA Max

5. AUDIO PERFORMANCE

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

• S/N Ratio (IHF-A+20kHZ LPF) ...................................80 dB (Typical at 1 KHz 0dB)

75 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 Level (1kHz 0dB) 47KΩ Load.........................0.8Vrms +20%

PN201

R207

C201

R212

Q203

D202

C218

LDO (CD)

MDI (CD)

LDO (DVD)

IC201 TA1293F

MDI (DVD)

Q205

D201

R256

R251

Vcc

DVD MD

DVD LD

CD MD

CD LD

DVD-LD(LASER DIODE)

CD-LD(LASER DIODE)

PICK-UP Unit

Monitor Diode

1-2. APC Circuit Operation

It controls the power of Laser Diode in the Optical Pick-up. To get the constant and stable LASER power, it uses the Monitor Diode in the Optical Pick-up.

IC201 (TA1293F) Pin : MDI1 -- DVD Laser Monitor Input

: MDI2 -- CD Laser Monitor Input

IC201 (TA1293F) Pin : LDO1 -- DVD Laser control signal output

: LDO2 -- CD Laser control signal output The detected current at the monitor diode is converted into voltage by I/V converter in the optical Pick-Up and this becomes the input signal of MDI(Pin 59, 3).

In the RF AMP this signal is amplified about 270 times (48.7dB) and then outputs form LDO (Pin 60, 2) and becomes the input of LD driving element (Q203 for DVD, Q205 for CD).

Q203 and Q205 are Transistors with 200hfe or more.

If DVD disc is loaded, only DVD APC System is operating and CD APC system is off by the command from the µ-com and CD disc is loaded CD APC system only operating.

1. APC (Automatic Power Control) Circuit

1-1. APC Circuit Constitution

DESCRIPTION OF CIRCUIT

60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41

40393837363534333231302928272625242322

2019181716151413121110987654321

P1TN

LDO1

MDI1

EQF

EQB

RFDC

GND2

EQD

Vcc2

VccO

PSC

FEB

TEB

DPDB

VccR

RFO

RPP

RPB

RPO

RPZ

P1TP

P1FN

P1FP

LDP1

GNDR

P1DI

P1CI

P1BI

P1AI

LDP2

P2AI

P2BI

P2CI

P2DI

GNDS

P2FP

P2FN

P2TP

P2TN

GNDP

LDO2

MDI2

VrA

Vrfi

VrD

Vdd

DPAC

DPBD

DPD1

DPD2

SCB

SCL

SCD

VRCK

VccP

DFTN

TEO

FEO

LVL

RFSW

VccS

VCKF

APC1

sel-RF

sel-PD

R-gain

Adjustment

sel-LVL

sel-TE2

sel-TE1

sel-FE

mode-RP

F-gain

Adjustment

F-gain

Adjustment

TEB

Generating

3BTE

T-gain

Adjustment

APC2

Vref

BUS

mode-TE

TE-gain

Adjustment

Level

Detection

Generating

DPDTE

TEB

DPDB

Generating

FE-gain

Adjustment

Generating

RF Ripple

C001

C002

CN05 DVD-VCC

CN06 DVD-VC

CN07 DVD-PD-GND

CN09 DVD-A

CN11 DVD-B

CN12 DVD-C

CN08 DVD-D

CN17 DVD-VR

CN16 DVD-MD

CN13 DVD-LD

CN14 DVD-LD-GND

CN15 DVD-HFM

CN02 FO+

CN03 FO-

CN04 TR+

CN01 TR-

CN23 CD-VCC

CN22 CD-VC

CN21 CD-GND

CN27 CD-C

CN25 CD-B

CN24 CD-A

CN28 CD-D

CN30 CD-F

CN29 CD-E

CN18 CD-VR

CN19 CD-MD

CN20 CD-LD

C010

C011

C012

VR10

U002

U001

TRACKING

FOCUS

C003

C004

L002

L001

Actuator

VR01

LASER DIODE

Frequency

Superposition

circuit

Time Constant

Adjustment

2. RF Amplifier Circuit

2-1. RF AMP Constitution

2-2. RF AMP Circuit Operation

In the Optical Pick-Up, Photo Diode receives the reflected LASER beam from the Disc and makes it into current . This current is converted into voltage by I/V Amp and input to RF AMP to make RF signal and Servo signals. Pick-Up unit has two LASER Diodes and Photo Diodes for CD and DVD respectively and they are controlled by µ-com separately.

(1) CD (CD-DA, CD-ROM, VIDEO-CD, CD-R, CD-RW)

In DRN-8040B the hologram module is used for CD optical system and conventional type is used for DVD optical system. There are 4 signals for CD Disc, they are A, B, E and F. (A+B) generate RF signal, (B-A) is focus error signal and (E-F) is tracking error signal.

(2) DVD (DVD-Single layer, Dual layer, DVD-R)

For DVD RF and servo signals, we use 4 optical pick-up signals, A, B, C and D. RF is generated by (A+B+C+D), Focus error is (A+C)-(B+D) and tracking error is the Phase difference of (A+C) and (B+D).

RF Amp (IC201 : TA1293F) has different input channels for CD and DVD. The input terminals for CD disc are Pin 72(A), 73(B), 74(C), 75(D), 79(E) and 80(F). For DVD, Pin 70(A), 69(B), 68(C), and 67(D) are used.

These Pick-Up signals are used for RF, Focus Error, Tracking Error and useful signals for stable servo system. RF Amp has Gain amplifiers for each signals to adjust the level of signals and µ-com control them by write the gain values into resisters in the RF Amp. (See the Fig.: TA1293F internal block diagram)

To make good RF signal, we use three RF equalization terminals, they are EQB (Pin 57), EQF (Pin 58), and EQD (Pin 54). Assigning the DC voltage to each terminal, DSP IC (TC9453F) control them. EQB adjust the amount of RF boost, and EQF is frequency bandwidth of RF signal. EQD is fixed to Vref (1.65V) now.

LVL (Pin 31) : Sub beam add signal (E+F), this is used for FOK (focus OK) and defect signal. RPO (Pin 42) : RF ripple signal (RF peck level-RF Bottom level) and using this DSP count the number

of crossed tracks. RPZ (Pin 41) : Center level of RPO RFO (Pin 45) : CD/DVD RF out. TEO (Pin 33) : Tracking Error out. FEO (Pin 34) : Focus Error out. VRCK (Pin 17) : The reference signal for RF Equalization and Servo signals (it is variable to CD or DVD

and Speed of Disc)

FOCUS & TRACKING SERVO PROCESS

SLED(Feed) SERVO PROCESS

Pick - Up

IC201

RF AMP TA1293F

B-A

A.B.C.D

E-F

(A+C)-(B+D)

(A. B. E. F)

DVD (A. B. C. D)

3B TE/ DPD TE

SELECTOR

FEO

Generating

DPD TE

Generating

3B TE

FOCUS ERROR DETECTOR

FOCUS & TRACKING

ACTUATOR

IC601

DRIVE BA5913FPY/ BA5918FPY

IC301

CD/DVD SERVO & DSP TC9453F

F+ F-T+ T-

LEVEL SHIFT

FOO

TRO

D/A

DIGITAL

EQUALIZER

(AUTO ADJUSTMENT CIRCUIT)

SLED

Control

Signal

A/D

TE FE

TEO

FMO

SLED MOTOR

PHOTO Interrupter

SL+ SL-

LEVEL SHIFT

IC601

DRIVE BA5913FPY/BA5918FPY

IC501

u-COM

SLED CLOCK

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 (TA1293F). It standardizes the laser beam (CD:A, B, DVD:A, B, C, D) radiated from the pick-up. Each other focus gain is made at the TA1293F (IC201) according to the disc, Focus Error signal is output from the FEO terminal and is input to Servo IC (IC401 TC9453F). After the first amplification of this signal, the signal is converted to A/D and input to Digital Equalizer Block and generates the focus servo ERROR signal with coefficient value is 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 FOO (IC401 TC9453F ). This signal goes through LPF (R435, C426), drives Focus Actuator through the Focus Drive IC (IC601:BA5918).

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 difference between A+C signal and B+D signal). According to the disc, Tracking Error is set at TA1293F, Gain or Path differs from each other, and the generated signal output through the TEO terminal. This signal input to TEI of IC401, after the first amplification, and converted to A/D. The signal converted to A/D input to the Digital Equalizer Tracking Servo Gain is generated with Digital Filter coefficient value set according to the disc at the µ-COM.

* Tracking balances at this digital equalizer automatically, adjusted balance input to pin TEB terminal of

IC201 through the pin (TEBC) of IC401. Tracking Error Balance is adjusted, and the reference level for the balance sets offset value to produce differently according to CD/DVD at the first disc drive. Tracking signal is converted to D/A through the pin TRO terminal of IC401 and output is through LPF (R436, C425), and input to IC601 (BA5913FP) 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 FMO of IC401. This value is through LPF(R437, C424) and the sled motor drove by the IC601 (Sled drive: BA5918FP).

158

164

162

159

PICK-UP

SPINDLE MOTOR ASSY

CD(A. B. E. F) A+B

CD RF

DVD RF

A+B+C+D

IC501

IC401

PLL BLOCK

CD/DVD

Motor

Hall Sensor

HU+ HUHV+ HVHW+ HW-

Speed Monitoring

u-com

CD/DVD SERVO & DSP TC9453F

IC201

RF AMP

TA1293F

DVD(A. B. C. D)

SPINDLE SERVO PROCESS

LEVEL SHIFT

AN8473SA

C423

R438

CAV DMO

4. Spindle Servo Circuit

4-1. SPINDLE SERVO PROCESS

4-2. Spindle Servo for CD/DVD

DRN-8040B consists of the 3 spindle control respectively. (1) DVD 4X : CAV (DVD signal & dual layer) (2) CD 12X : CAV (CD-DA, CD-RW, Video-CD, Host command standby of CD-ROM) (3) CD 24X : CAV (CD-ROM, CD-R, CD-R playback mode)

In the spindle speed control mode respectively. DRN-8040B has only full CAV system in speed of DVD x4, CD x12 and CD x24. In each speed mode, µ-com writes the sets of disc speed commands to DSP (IC401) resisters. And these command sets and FG signal from the spindle motor determine the speed of disc automatically. First, DSP (IC401) monitoring the FG signal of spindle motor through the Pin 175(FG), and compares it’s duty (frequency) with desired speed mode in DSP resisters that is written by µ-com. To make and sustain the each CAV Speed, DSP (IC401) controls the spindle motor by DMO (Pin 163) signal. This DMO signal goes to spindle motor drive IC and it’s output signals U, V and W drive the spindle motor. In DVD x4, CDx12 and CDx24 CAV mode DSP (IC401) monitoring the FG signal of Spindle Motor and control the speed of each mode by sets of coeffecients that

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