LG DRD-820B Manual

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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

• ATAPI interface

• DVD-5, DVD-9, DVD-10, and DVD-18 Capable

• CD-R, CD-RW compatible

• Internal 5.25 inch, halfheight DVD-ROM Drive

• 100ms Average Access Time in CD-ROM Mode

• Supports 1X, 4X and 24X (max.) Rotational Modes in CD

°‹

Mode

• Max 3,240 kB/sec Sustained Transfer rate in CD mode

• Photo-CD Multisession Disc Spec compliant

• MPC-3 Spec compliant

• Power Tray Loading/Ejection Mechanism

• 3-Way Eject Support (Software, O/C Button, Emergency

Eject)

1. SUPPORTED SYSTEM

• IBM Compatible Pentium 133MHz or Above

2. SUPPORTED OS

• MS-DOS (Ver 3.1 or Higher)

• Windows 3.1/95

• Windows NT (Ver 3.5, Ver 4.0)

3. GENERAL PERFORMANCE

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

• Data Buffer Capacity .................................................................................................................. 256 kbytes

• Access Time .................................................................. Random Access

4. POWER REQUIREMENTS

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

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

• Current ...................................................................................... +12V : 400mA (Average), 1.2A (Maximum)

5. AUDIO PERFORMANCE

• Frequency Response ................................................................................................ 100Hz~20KHz( 3dB)

• S/N Ratio (IHF-A+20kHZ LPF) ....................................................................... 85 dB (Typical at 1 KHz 0dB)

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

• Channel Separation (IHF-A+20kHZ LPF) .............................................................................. 80 dB(Typical)

• Output Voltage (1kHz 0dB) 47KΩ

• Headphone Level (1kHz 0dB) 33Ω

INTRODUCTION

form. This DVD-ROM Drive was manufactured and

assembled under our strict quality control standards

and meets or exceeds industry specifications and

standards.

GENERAL FEATURE

• 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 (50,000H) POH (at 10% Utilization)

• PIO Mode 4 & Multiword DMA Mode 2 Support

• Horizontal and Vertical Mounting

• Digital audio output connector

• Digital audio through ATAPI Interface

• Spin-down Mode for energy saving

SPECIFICATIONS

• MPEG •± Board or Software MPEG •± Program

• OS/2 Warp (Ver 3.0)

• Solaris (Ver 2.4 or Higher)

• Linux '96 Slacware (Ver 3.1.0)

Load .............................................................................. 1.0Vrms + 20%

Load .......................................................................... 0.7Vrms

DVD : Approx. 2.70Mbytes/sec

CD :

Approx. 150kbytes/sec (1X CD)

Approx. 1,500~3,600kbytes/sec (10~24X CD)

CD : 150ms Typical (10~24X CD)

+5V : 500mA (Average), 0.8A (Maximum)

DVD : 200ms Typical

250ms Typical (1X CD)

+12V DC°æ5%

+12V : 100mVp-p

80 dB (Limit at 1 KHz 0dB)

0.15% (Limit at 1 KHz 0dB)

70 dB(Limit)

20%

Table of Contents

Summary of Contents for LG DRD-820B

Page 1 INTRODUCTION This service manual provides a variety of service form. This DVD-ROM Drive was manufactured and information. It contains the mechanical structure of assembled under our strict quality control standards the DVD-ROM Drive together with mechanical and meets or exceeds industry specifications and adjustments and the electronic circuits in schematic standards.
Page 2: Location Of Customer Controls
LOCATION OF CUSTOMER CONTROLS FRONT VIEW COMPACT R O M Figure 1. Front View Headphone Jack Play/Skip Button 3.5mm jack for monitoring the audio signal from When an Audio CD is in the Disc Drawer, pressing audio CDs. this button will start playing audio CDs from the first track.
Page 3: Cabinet And Circuit Board Disassembly
DISASSEMBLY 1. CABINET and CIRCUIT BOARD 1-3. Cabinet and Main Circuit Board A. Remove the Cabinet in the direction of arrow (4). DISASSEMBLY (See Fig. 1-3) 1-1. Bottom Cover B. Release 2 hooks (a) and remove the Clamp in the A.
Page 4: Internal Structure Of The Pick-Up
INTERNAL STRUCTURE OF THE PICK-UP 1. Structure of the Pick-Up U001 CN03 DVD-VCC C002 CN02 DVD-VC C001 CN01 DVD-GND CN06 DVD-A CN07 DVD-B CN04 DVD-C CN05 DVD-D CN08 DVD-VR LASER DIODE VR01 CN09 DVD-MD L002 CN11 DVD-LD C004 CN10 DVD-LDGND C003 CN12 DVD-HFM...
Page 5 2. Structure of the Photo Diode (CD) (As seen from light receiving side) (1) Focus Error Signal (A-B) • In case of CD Disc This signal is generated in RF AMP IC (IC201 : TA1254F) and controls the pick-up’s up and down to focus on CD Disc.
Page 6 3. Structure of the Photo Diode (DVD) (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 (IC201 : TA1254F) and controls the pick-up’s up and down to focus on DVD Disc.
Page 7: Description Of Circuit
DESCRIPTION OF CIRCUIT 1. APC (Automatic Power Control) Circuit 1-1. APC Circuit Constitution IC201 TA1254F PN201 DVD-LD(LASER DIODE) DVD- MDI (DVD) DVD- R201 C201 Monitor R202 Diode LDO (DVD) R203 Q201 R205 D201 CD-LD(LASER DIODE) MDI (CD) Monitor LDO (CD) C216 R217 Diode...
Page 8 2. RF Amplifier Circuit 2-1. RF AMP Constitution...
Page 9 The A, B, C, E and F signals output from the pick-up for CD. (Refer to "structure of the pick-up".) This model, DRD-820B takes the hologram method for CD LD, no D signal. RF is generated to (A+B+2C), Focus Error is B-C, and Tracking Error is E-F.
Page 10: Focus/Tracking/Sled Servo Circuit
3. Focus/Tracking/Sled Servo Circuit 3-1. FOCUS, TRACKING & SLED SERVO PROCESS FOCUS & TRACKING SERVO PROCESS IC201 RF AMP Pick - Up TA1254F (A. B. C. E. F) FOCUS ERROR DETECTOR Generating DVD (A. B. C. D) (A+C)-(B+D) 3B TE 3B TE/ A.B.C.D DPD TE...
Page 11 3-2. Focus Servo for CD/DVD Focus Servo for CD/DVD is based on focus error signal generated from RF AMP (TA1254F). It standardizes the laser beam (CD:A, B, DVD:A, B, C, D) radiated from the pick-up. Each other focus gain or path is made at the TA1254F (IC201) according to the disc, Focus Error signal output from the FEO terminal and input to Servo IC (IC301 TC9461F).
Page 12: Spindle Servo Circuit
PLL BLOCK (DVD 2X) <CLV> 4-2. Spindle Servo for CD/DVD DRD-820B consists of the four spindle control respectively. (1)CD x 1 : CLV (CD-DA, for all discs) (2)DVD 2 : CLV (DVD Single, Dual Layer) (3) CD 14 (max.) : CAV (CD-RW, Video-CD, Host command stand-by of CD-ROM and CD-R) (4) CD 24 (max.) : CAV (CD-R, CD-ROM play mode)
Page 13: Description Of Data Processing
DESCRIPTION OF DATA PROCESSING 1. CD Data Processing Flow...
Page 14 2. DVD Data Processing Flow...
Page 15: Copy Protection And Regional Code Management Block
3. Copy Protection and Regional Code Management Block Block Diagram Change the "KEY" HOST DVD DVD Data from PLAYER TC6817AF the TC90A41AF (MPEG2 B/D) Scrambled MPEG Data H8/3048 KEY Management Control 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.
Page 16: About Prevention The Dvd-Rom From To Be Copy
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.
Page 17: About The Dvd-Rom Regional Code
5. About the DVD-ROM Regional Code Regional code U.S.A PRI. VIR DISC ROM - DRIVE MPEG-2 BOARD VGA CARD MONITOR Transfer to Receiving If the board is setting to the regional The disc has MPEG-2 board data from the code 1 for the U.S.A..the regional reading the MPEG-2...
Page 18: Major Ic Internal Block Diagram And Pin Description
MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION IC201 (TA1254F) : RF Signal Processing for CD/DVD It amplifies or equalize the RF signal from Pick-up, and generate the TE (Tracking Error) and FE (Focus Error) signal for Servo respectively. The TE signal uses the DPD (Differential Phase Detect) method for DVD and 3 Beam method for DVD FE=(A+C)-(B+D) CD FE=A-B Block Diagram...
Page 19 IC201 (TA1254F) Pin Description Pin No. Pin Name Description Remark P2TP TE + Input (CD) P2TN TE - Input (CD) LDO2 Drive Output MDI2 Motor Input Analog V About 2.0V Digital V 1/2 of Vdd Power Voltage About 4.2V (3.3V) DPAC DPD AC Capacity 1 DPBD...
Page 20 Pin No. Pin Name Description Remark RFDC DC Feedback capacity RF Full Adder Boost Adjustment EQB is up, Boost volume is up. Frequency Adjustment EQF is up, shift to high frequency. MDI1 Monitor input LDO1 Drive Output P1TN TE - input (DVD) P1TP TE + input (DVD) Connect to GND...
Page 21 IC301 (TC9461F) : CD DSP & Digital Servo Processor IC301 receives the RF output signal of IC201 demodulates EFM, transfer to IC701 (TC6817F), and converts the analog audio signal output through the D/A convertor. RF, TE and FE signal of IC201, related to servo, passes through the servo circuit of IC301, outputs the control signal to PWM or D/A, and are transferred to Drive IC for the most desired servo.
Page 22 Pin Description Description Remark Pin No. Pin Name Digital GND Bit Clock (1.4122MHz) Output Audio data output AOUT Digital output DOUT Buffer Memory over signal output MBOV When over is" " Compensated output IPF outputs “H” when AOUT output has a symbol which can’t correct the error in the error correction mode.
Page 23 Pin No. Pin Name Description Remark SLCO DAC output for generating Data Slice Level Analog output RF Input Analog input (Zin:Command select) AVDD Analog power VDD RFCT RFRP signal Center Level input Analog input (Zin=50KΩ ) RFZI RFRP Zero Cross input Analog input RFRP RF Ripple signal input...
Page 24 Pin No. Pin Name Description Remark I/O General I/O Port Convertable to input port and output port by a command In input port mode, readable the terminal condition(H/L) to read command In output port mode, be able to control the terminal condition(H/L/Hi-Z) to command /DMOUT It selects the mode output 2 state PWM of disc EQ at IO 2, Enhanced Pull-Up resistor...
Page 25 Pin No. Pin Name Description Remark /RST 1) Reset signal input Enhanced Pull-up resistor 1) “L” is at reset mode TESTO TEST terminal Enhanced Pull-up resistor Normally, Opened /HSO Playback speed mode flag output /UHSO /UHSO /HSO Playback speed Emphasis Flag output for Sub Code Q data EMPH “H”...
Page 26 IC401 (TC90A41AF) : DVD DSP (Digital Signal Processing ) & DVD Spindle Servo It receives the DVD RF From IC201 (TA1254F), works data slice, and transfer data to IC701 (TC6817F) with ECC. It outputs PWM signal used in spindle Servo from Pin 52 to control the spindle servo in DVD mode. Block Diagram RVR1 RVSS...
Page 27 IC401 (TC90A41AF) Pin Description Pin No. Pin Name Remarks Description 0.5~3.3Vpp DPCKI Signal management reference clock input Enhanced feedback resistor DVDD3 Logic cell Digital VDD3 (3.3V) SVCKI 3.3V-I/F Servo reference clock input (oscillating circuit input) Enhanced feedback resistor SVCKO OUT Servo reference clock output (oscillating circuit input) DVSS For Logic cell Digital GND (0V)
Page 28 Pin No. Pin Name Description Remarks AVSS Analog GND (0V) OUT Analog reference Voltage (1.65V) for non-PLL Resistor divide point electrical potential (Analog reference electrical potential:1.65V) OUT Analog reference voltage (1.65V) for PLL AVDD Analog AV (3.3V) RVR2 Secondary reference voltage (for condenser connection) RVDD Exclusive power supply terminal (3.3V) RFIN...
Page 29 Pin No. Pin Name Description Remarks OUT MPEG DATA output DVSS Digital GND (0V) For Logic cell DVDD3 , Digital (3.3V) For Logic cell OUT MPEG DATA output OUT MPEG DATA output OUT MPEG DATA output OUT MPEG DATA output SERR OUT MPEG DATA Reliability Flag (Data Error= "L") SBGN...
Page 30 IC501 (H8/3048) : µ COM It Controls the total system giving or taking the data from the peripheral ICS. Pin Description H8/3048 DRD-820B Description pin name pin name VCC1 PB-0 FLAGA PB-1 FLAGB PB-2 FLAGD DVD or CD output (DVD="0", CD="1")
Page 31 H8/3048 DRD-820B Description pin name pin name P1-3 MADDR3 Address 3 to/from TC6817F P1-4 MADDR4 Address 4 to/from TC6817F P1-5 MADDR5 Address 5 to/from TC6817F P1-6 P1-7 VSS3 P2-0 MDAT0 Data 0 to/from TC6817F, TC90A41AF P2-1 MDAT1 Data 1 to/from TC6817F, TC90A41AF...
Page 32 H8/3048 DRD-820B Description pin name pin name P7-4 /LOADOUT Tray opened S/W input P7-5 SLEDRef Sled Drive reference A/D input P7-6 Sled gain control D/A output P7-7 PONG Avss AVSS P8-0 /INTDEC IRQ0 request from TC6817F P8-1 /INTDVD IRQ1 request from TC90A41F...
Page 33 IC602 (BA6849) : Spindle Motor Drive IC It drives the spindle motor receiving the spindle control signal at IC301 (TC9420) in CD mode and IC401 (TC90A19) in DVD mode. SHORT BRAKE Block Diagram DRIVER CURRENT SENSE AMP GAIN VCC1 CONTROL Vcc1 HALL TORQUE...
Page 34 IC603 (BA6792-Y) : Sled Motor/Loading Motor Control Drive IC It controls the sled movement and takes the tray to open/close in track search mode. IC604 (BA6792-Y) : Focus/Tracking Actuator Control Drive IC This Drive IC controls the Focus/Tracking Actuator receiving the focus error or tracking error signal from IC301.
Page 35 IC701 (TC6817AF) : Enhanced IDE Interface CD/DVD ROM Decoder • It is a CD/DVD Decoder enhanced the IDE rated interface. • Data of DVD Disc is transferred. • Confirmation management • Correspond to Max 24 x CD DISC Block Diagram Buffer CSEL DRAM 128k word / 64k word...
Page 36 Pin Description Pin No. Pin Name Description °© DASP I/O Drive Active In/Output PIO3 General Purpose PIO terminal /CSEL PIO2 PIO1 PIO0 CKSTP Input for Internal Clock Partial stop °© °© Power Supply terminal BD15 BD14 BD13 BD12 BD11 I/O Buffer RAM data In/Output BD10 °©...
Page 37 Pin No. Pin Name Description Buffer Address Output I/O General Purpose PIO terminal PIO9 TEST0 TEST1 Test terminal, Fixed " L" . TEST2 SBSY Subcode Playback block Sync Signal Input 75Hz at 1X , " H" is at S1 of Subcode Sync SFSY Synchronizing Frame Signal Input readable the Sub code data 7.35KHz at 1X .
Page 38 Pin Name Description Pin No. DVD Data 0 DVD Data 1 DVD Data 2 DVD Data 3 DVD Data 4 DVD Data 5 DVD Data 6 DVD Data 7 Micom Data In/Output 0 Micom Data In/Output 1 I/O Micom Data In/Output 2 (3 State Output) Micom Data In/Output 3 Micom Data In/Output 4...
Page 39 Description Pin No. Pin Name HD11 HD12 I/O HOST Data In/Output °≤0~15°≥ HD13 HD14 Power supply terminal I/O HOST Data In/Output 15 HD15 Data Request Output HDRQ HOST Write Signal Input HOST Read Signal Input IO Transfer Ready Output IORDY Power supply terminal Data Acknowledge Input HDAK...
Page 40: Troubleshooting Guide
TROUBLESHOOTING GUIDE 1. Initial Lead-in Operation Reset or Power-On. LED Flickers. Pick-Up moves to the inner-Track. Rotate disc (Spindle Motor) Laser on the Pick-up lights. Focus Search (Through moving up and down the lens of Pick-Up) Focus Servo On (Q301 Collector : H" "...
Page 41 3. Troubleshooting Guide (In the Initial Lead-in Operation Mode) Reset or Power On. DVD-ROM doesn’t work wholly. Does the 5V/12V appear Check the PC Power Line. on power C/N? Does the 5V appear at the Does the 8~9V appear at Replace R106, R107.
Page 42 Does the signal appear at Replace IC501.(µ-COM) the Pin 16 of IC603? close Normal open Replace IC603. Does the signal appear at the Pins 11,12 of IC603? Replace MD Assembly. (Loading Motor is defective.) open close Does the signal appear in Does Pick-Up move to IC603 Pin 24? inner track?
Page 43 Does the signal appear at Check and the Pin 22 of IC601? Replace IC602. 2.1V Does the signal appear at IC601 PIns 2, 4, 7? Replace IC601. Replace MD Assembly. (Spindle Motor is defective.) Does the signal appear at Does the RF signal IC201 Pin 21? appear at PN201 Pins 1, (When Disc is rotating first)
Page 44 Does the Focus Coil Drive Replace IC604. signal appear at IC604 Pins 2, 3? 2.5V 2.1V Replace MD Assembly. (Focus Actuator is defective.) Does the DVD RF output at Replace MD Assembly. Does DVD Disc rotate the Pins 15, 16, 17, 18 of (Pick-up is defective.) normally? PN201?
Page 45 4. Troubleshooting Guide (In the Operation Mode) Does the speaker well Does the Audio signal Check the sound card of work during Audio CD appear at PN701 Pins 51, PC or Speaker. play? Does the Audio signal Check Q803, Q804, Q801, appear at IC301 Pins 77, Q802 and Replace.
Page 46 Can' t Down Load µ-COM Does the host computer Replace IC501 or IC701. recognize the DVD-ROM program from host Working well? Drive? computer. Check the Interface Cable Replace Main Circuit Board. and Master/Slave option.
Page 47 EXPLODED VIEW PBM00 (MAIN C.B.A)

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