LG GDR-8162B Service Manual

Dvd-rom drive
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DVD-ROM DRIVE
S E RVICE MANUAL
MODEL: GDR-8162B
MODEL : GDR-8162B
P/NO : 3828HS1038E
June, 2003
Printed in Korea

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  • Page 1 DVD-ROM DRIVE S E RVICE MANUAL MODEL: GDR-8162B MODEL : GDR-8162B P/NO : 3828HS1038E June, 2003 Printed in Korea...
  • Page 2: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION..............................3 GENERAL FEATURES ............................3 SPECIFICATIONS ..............................4 LOCATION OF CUSTOMER CONTROLS......................5 DISASSEMBLY ..............................6 1. CABINET and CIRCUIT BOARD DISASSEMBLY..................6 1-1. Bottom Chassis............................6 1-2. Front Bezel Assy.............................6 1-3. Cabinet and Main Circuit Board ......................6 2. MECHANISM ASSY............................6 2-1. Base Pick-up Unit Assy ..........................6 EXPLODED VIEW .............................7~8 MECHANICAL REPLACEMENT PARTS LIST....................9~12 INTERNAL STRUCTURE OF THE PICK-UP....................13~17...
  • Page 3: Introduction

    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 4: Specifications

    SPECIFICATIONS 1. SUPPORTED SYSTEM • IBM Compatible Pentium 133MHz or Above (with PIO mode 4, TX chip set recommended) 2. SUPPORTED OS • MS-DOS (Ver 3.1 or Higher) • OS/2 Warp (Ver 3.0) • Windows 3.1/95/98/2000/ME/XP • Solaris (Ver 2.4 or Higher) •...
  • Page 5: Location Of Customer Controls

    LOCATION OF CUSTOMER CONTROLS FRONT VIEW R O M R O M R O M R O M COMPACT Disc Drawer Emergency Eject Hole Accepts a CD-ROM/DVD-ROM disc on its tray. Insert a paper clip here to eject the drawer manually or when there is no power.
  • Page 6: 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 Chassis B. Release 2 hooks (a) and remove the CD Tray. A. Release 4 screws (A) and remove the Bottom C.
  • Page 7: Exploded View

    EXPLODED VIEW PBM00 (MAIN C.B.A)
  • Page 8: Internal Structure Of The Pick

    INTERNAL STRUCTURE OF THE PICK-UP 1. Structure of the Pick-Up PICK-UP UNIT Q001 CN18 VCC CN06 VC (Vref). CN05 GND-PD CN10 A/a CN09 B/b CN15 C/c CN14 D/d CN17 E1/e2+f2 CN16 E2/e3+f3 CN07 F1/e1+f1 CN08 F2/e4+f4 CN11 CD/DVD SW DVD= 0V C D=+5V CN13 RF+ CN12 RF-...
  • Page 9 For CD For DVD SF-HD67 VRCD VRDVD CD: Hi DVD: Lo IC201 IC101 Q102,Q104 Monitor resister SW circuit 1. Structure of the Pick-up SF-HD67 is consist of monitor diode for DVD laser and CD laser. When DVD laser is ON, CN101 20 Pin is need to connect GND for getting monitor voltage.(CN101 22 pin). When CD laser is ON, CN101 19 Pin is need to connect GND for getting monitor voltage.(CN101 22 pin).
  • Page 10: Structure Of The Photo Diode (Cd)

    2. Structure of the Photo Diode (CD) (As seen from light receiving side) 1) Focus Error Signal –> (A + C) - (B+C) • In case of CD Disc This signal is generated in RF AMP IC (IC101) and controls the pick-up’s up and down to focus on CD Disc.
  • Page 11: Structure Of The Photo Diode (Dvd-Rom)

    3. Structure of the Photo Diode (DVD-ROM) (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 (IC101) and controls the pick-up’s up and down to focus on DVD Disc.
  • Page 12: Structure Of The Photo Diode (Dvd-Ram)

    4. Structure of the Photo Diode (DVD-RAM) (As seen from light receiving side) 1) Focus Error Signal –> {(a+c) - (b+d)} - 1.17 x {(e ) - (e • In case of DVD Disc This signal is generated in RF AMP IC (IC101) and controls the pick-up’s up and down to focus on DVD Disc.
  • Page 13: Description Of Circuit

    DESCRIPTION OF CIRCUIT 1. ALPC (Automatic laser power control) 1-1. ALPC Circuit Constitution Dual laser power control for DVD and CD are provided. The laser ON for DVD or CD can be selected by ¡ LDSEL¡– and the lasers ON/OFF are controlled by ¡ LDOFF¡– . Laser power for DVD and CD can be programmable by ¡...
  • Page 14: Rf Amplifier Circuit

    2. RF Amplifier Circuit IC101 IC201 RFINP For boost 0.5Vpp Slicer NARF 0.5Vpp RFINN For fc AGCG AGCO 1.65V RF Amplifier Circuit 2-1. Input stage The differential RF signal for data read from pick up may feed into IC101 pin 34 and pin 35. 2-2.
  • Page 15: Servo Signal

    3. SERVO SIGNAL 3-1. FOCUSING ERROR (FE) x1.17 S-Curve : about 1.65Vpp S-Center : 1.65V FESEL 0, 1 IC201 Offset Add. Detect circuit Amplitude 1.65V FBAL 3.3V Tracking 1.65V Focusing Error circuit FE for DVD-ROM,CD are made from 4D(A,B,C,D). FE S-curve amplitude is detected from IC201 109 pin and FE gain is controlled by register “FEG” to keep 1.65V amplitude.
  • Page 16 3-2. AS (ALL SUM) IC101 IC201 FOCUS ON : about 2.5V FOCUS OFF : about 1.65V Detect Amplitude 1.65V 1.65V AS circuit AS(All sum) signal is obtained from low pass filter and FOK is made from AS signal in IC201. This FOK signal is used to check servo status.
  • Page 17 3-3. TRACKING ERROR (TE) 3-3-1. TE for DVD-ROM (DPD) IC201 H.P.F Balance Detect H.P.F. H.P.F 1.65V TESEL H.P.F. 1.65V 1.65Vpp Center Voltage = 1.65V Tracking error Circuit TE signal for DVD-ROM is made by DPD (Differential Phase Detect) method. TE signal is made that add voltage obtain form phase differnece of front spot A, D to voltage obtain two phase difference of rear spot B, C.
  • Page 18 3-3-2. TE for DVD-RAM, CD (DPP) IC101 DVD-RAM 2.6G, 4.7G : x1.17 CD : x1.9 IC201 DPPG 1.65Vpp. Center voltage =1.65V Offset Bal. TESEL Detect 1.65V 1.65V Tracking error Circuit TE signal for DVD-RAM 2.6G,4.7G is programmable by DPP. In case of DVD-RAM,sub spot(sub beam) is amplified by 1.17times and 1.9times in case of CD and add into main spot(main beam).
  • Page 19 3-4. LNSC (LENS CENTER SIGNAL) RFDiF LNSC Circuit RFDiF(LENSC) signal is used as error signal for tracking servo. This signal is used only for long seek (about 1000 track seek). This signal make lens fixed at detector center.
  • Page 20 3-5. FOCUS SERVO IC201 IC101 Parallel digital compensator IC301 (Drive IC) Amplitude Detect 1.65V DC Voltage Focus search Generator Algorithm Focus servo system Focus servo system is used to find focus ON point and to trace focus actuator into focus point using parallel digital compensator.
  • Page 21 3-6. TRACKING SERVO SYSTEM IC201 IC301 Parallel (Drive IC) digital compensator Lens control RFDiF (LNSC) 3.3V Sled Compensator Quantity of Lens shift Controlled by prediction and lens shift quantity. SIN1 IC301 (Drive IC) SIN2 To control stepping motor Tracking servo system Tracking servo is used to follow trace center of detector with TE signal and to control stepping motor.
  • Page 22 IC201 Compensator IC201 (Tracking cross) Track number counter 1.65V 1.65V Tracking cross for seek control TKC is digital signal of “H”, “L” which is compared to TE signal in center of amplitude. TKC is used to make constant track cross speed and jumped track count in case of multi-jump (number of track: about less than 1000 track)in IC201.
  • Page 23: About Dvd-Ram 2.6G, 4.7G Signal

    4. About DVD-RAM 2.6G, 4.7G signal User data section CAPA section User data section PG101 IC101 RFDIF IC201 IDGATE IC201 DTRD IC202 VFOSHORT IC101 Signal timing for DVD-RAM 2.6G, 4.7G...
  • Page 24 IC101 IC201 IDGATE Generator Comparator RFDIF Only Seek DTRD Generator VFOSHORT SLICER Generator NARF Decoder 124 123 DTRD IDGATE VFOSHORT DVD-RAM 2.6G, 4.7G system DVD-RAM 2.6G, 4.7G have CAPA(Complementary Allocated Pit Address) differnt from DVD-ROM. CAPA is consist of same pit like DVD-ROM disk,that’s why even blank disk has it. CAPA has PID(Physical ID) which shows address on disk.
  • Page 25: Description Of Data Processing

    DESCRIPTION OF DATA PROCESSING 1. Data Processing Flow...
  • Page 26: Copy Protection And Regional Code Management Block

    2. Copy Protection and Regional Code Management Block Block Diagram Change the "KEY" HOST DVD PLAYER MN103S71 (EMPEG2 DECODER) Scrambled MPEG Data 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 27: About Prevention The Dvd-Rom From To Be Copy

    3. 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 28: About The Dvd-Rom Regional Code

    4. About the DVD-ROM Regional Code Regional code U.S.A PRI. VIR DISC ROM - DRIVE MPEG-2 DECODER VGA CARD MONITOR Transfer to Receiving If the board is setting to the regional The disc has MPEG-2 data from the code 1 for the U.S.A..the regional decoder Check the received regional code to...
  • Page 29: Major Ic Internal Block Diagram And Pin Description

    MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION IC101 (AN22022A) Block Diagram DTRD IDGT STDI LPC1 LPCO1 LPC2 LPCO2 TEOUT RFDIF0 JLINE...
  • Page 30 • Pin Description Function Function VINI2 3-beam sub(cd) input 2 RFOUT RF full-addition amplifier output LPC1 Laser pin input (DVD head) DCRF DC-cut filter of RF full-addition amplifier LPCO1 Laser drive output (DVD head) OFTR OFTR output LPC2 Laser pin input (CD head) BDO output LPCO2 Laser drive output (CD head)
  • Page 31 IC201 (MN103S71) DSP & Interface LSI Block Diagram HOST I/F DMA I/F DVD-ROM ANALOG CD-PRE Formatter ATAPI High Speed IO bus Command Memory CGEN SERVO IO (96 kbyte) OnChip 32Bit Debug CPU core SERVO MODE 2Mbit DRAMC DRAM General purpose IO Bus General Serial SYSTEM...
  • Page 32 • Pin Assignment NTRYCL/MONI7 NEJECT/MONI6 DASPST/MONI5 P4/EXCNT0 MSTPOL/MONI4 VDD3 MONI3/P12 MONI2/P11 P5/EXCNT1 MONI1/P10 P6/NSPCCS MONI0/P9 P7/FADR17 DTRD P8/FADR18 IDGT FADR11 VDD3 FADR9 VDD15 FADR8 PWM(2) FADR13 PWM(1) FADR14 AVSSA FADR16 MN103S71F FADR15 DRAMVDD15 DRAMVSS LQFP176-P-2424B FADR12 FADR7 FADR6 TOPVIEW FADR5 TECAPA FADR4 AVDDA...
  • Page 33 • Pin Description Pin No Pin name Connect to Description General purpose port General purpose port P4/EXCNT0 General purpose port / External terminal count VDD3 Power VDD (3.3V) P5/EXCNT1 General purpose port / External terminal count P6/NSPCCS General purpose port / SPC CS P7/FADR17 toFLASH General purpose port / FLASH address out...
  • Page 34 Pin No Pin name Connect to Description FDT6 toFLASH FLASH data In/out FDT7 toFLASH FLASH data In/out toFLASH FLASH chip reset signal out FADR10 toFLASH FLASH address out toFLASH FLASH read signal out MMOD Test mode change signal NRST fromRSTIC Reset input SCLOCk DWire data pin *1...
  • Page 35 Pin No Pin name Connect to Description VDD15 Power VDD (1.5V) TSTSG toFEP EQ calibration signal VFOSHORT toFEP VFO short output JLINE toFEP J-line setting output fromFEP Drop out signal input OFTR fromFEP Off track signal input AVSSD Analog VSS ROUT MASH Rch audio output LOUT...
  • Page 36 Pin No Pin name Connect to Description fromFEP CAPA envelope input/hold capacitor fromFEP TE signal+ fromFEP TE signal- AVSSA Analog VSS PWM1 toDRVIC Focus drive output PWM2 toDRVIC Tracking drive output VDD3 Power VDD (3.3V) IDGT toFEP CAPA change signal DTRD toFEP Data part freq.
  • Page 37 Pin No Pin name Connect to Description HDD14 toHOST ATAPI data output HDD1 toHOST ATAPI data output HDD13 toHOST ATAPI data output VDD3 Power VDD (3.3V) VDD15 Power VDD (1.5V) HDD2 toHOST ATAPI data output HDD12 toHOST ATAPI data output HDD3 toHOST ATAPI data output...
  • Page 38 IC301 (M63028FP): Drive IC Block Diagram 14 13 12 M63028FG:FGx3 Reverse Detect HU+ 21 HU- 20 HV+ 19 MATRIX Logic Logic HV- 18 HW+ 17 HW- 16 Hall Bias Current Current Current amp. comp. amp. comp. amp. comp. Direction Direction BIAS SPIN 26 Direction...
  • Page 39: Troubleshooting Guide

    TROUBLESHOOTING GUIDE...
  • Page 40 LED doesn’t light up Note : When circuit number is written, check parts and soldering including a nearby circuit. When two or more pin mumbers are indicated by the party, check signal-line including a nearby circuit. Check item • 5V power short CN701(43)-(44) : 5V? •...
  • Page 41 (When a power supply is switched on) Pick-up not slide Note : Pick-up unit slide, when Power ON(or drive reset) or disc tray closed. Pick-up slide to TOC area of disc, after going to the maximum inner side. The distance between the maximum inner side and TOC area of disc is about 3mm. Check item Note : When the circuit number is written, check parts and Check waveform :...
  • Page 42 CN701(44) : 2 V/div DC CN701(44) : 2 V/div DC IC301(1) : 2 V/div DC IC301(38) : 2 V/div DC IC301(9) : 10 V/div DC IC301(41) : 2 V/div DC IC301(10) : 10 V/div DC IC301(25) : 2 V/div DC 0.5 s/div <<no disc>>...
  • Page 43 Reference information of slide motor control REF-0 CN701(44) : 5 V/div DC IC301(41) : 5 V/div DC IC301(1) : 1 V/div DC IC301(2) : 1 V/div DC 2.5 s/div Zoom : REF-4 Zoom : REF-3 Zoom : REF-2 Zoom : REF-1 REF-1 REF-2 CN701(44) : 5 V/div DC...
  • Page 44 Tray open/close doesn’t work Note : When the circuit number is written, check parts and soldering including a nearby circuit. When two or more pin numbers are indicated by the party, check signal-line including a nearby circuit. Check item • SW701 Push SW701 then, •...
  • Page 45 SW701 Loding M TM403 SW401 sub PWB CN402 CN402 CN401 main PWB CN401 IC201 3.3VD 3.3VA u-COM 1.5V CTL1 CTL2 Mute CONT. 3.3VA IC101 VHALF IC301 CN701 IC501 3.3VD 3.3VA 1.5V IC502 IC201(131):5V/div DC IC201(131):5V/div DC IC301(40):5V/div DC IC301(40):5V/div DC TM403(2):5V/div DC IC201(132):5V/div DC IC201(176):5V/div DC...
  • Page 46 Disc-motor doesn’t rotate. Note : When the circuit number is written, check parts and soldering including a nearby circuit. LASER light up? When two or more pin numbers are indicated by the refer : LASER check party, check signal-line including a nearby circuit. Focus servo OK? refer : Focus servo check.
  • Page 47 Spindle M. CN301 3.3VD R292 IC201 Servo 3.3VD control 3.3VA 3phase Driver CTL1 1.5V u-COM CTL2 3phase control Mute IC101 CONT. 3.3VA VHALF IC301 R307 CN701 IC501 3.3VD 3.3VA IC502 1.5V IC301(12):10V/div DC IC301(26):2V/div DC IC301(21):200mV/div AC IC301(13):10V/div DC IC301(20):200mV/div AC IC301(14):10V/div DC IC301(24):5V/div DC IC301(24):5V/div DC...
  • Page 48 Note : When the circuit number is written, check parts and LED doesn’t OFF soldering including a nearby circuit. When two or more pin numbers are indicated by the party, check signal-line including a nearby circuit. Check item When a power supply is Refer switched on.
  • Page 49 CN101 IC101 TE Gen. 3.3VA VHALF Pickup unit IC201 3.3VD Focus servo 3.3VA CTL1 1.5V Focus actuater u-COM CTL2 Mute CONT. IC301 CN701 IC501 3.3VD 3.3VA IC502 1.5V 3.3VA PG101 IC201 IC101 Pickup unit 3.3VD 3.3VA RF/AGC 1.5V NARF Photo detector IC101(14) : 2 V/div DC IC101(14) : 500 mV/div AC IC301(28) : 2 V/div DC...
  • Page 50 LASER check. Caution : Don’t see LASER for your eyes!! CD LASER Note : When the circuit number is written, check parts and soldering including a nearby circuit. DVD LASER When two or more pin numbers are indicated by the Check item party, check signal-line including a nearby circuit.
  • Page 51 Check item • Q101 IC101(5) : 3.6V • IC101(3) -- Q101 -- CN101(25) IC101(38) : 5V • 5V power-line. IC101(45) : 5V • 3.3VA power-line. IC101(41) : 3.3V • IC501 soldering check : IC101(10) -- IC201(70) IC101(11) -- IC201(68) IC101(12) -- IC201(69) •...
  • Page 52 Focus servo check After the LASER check, Note : When the circuit number is written, check parts and do this check item! soldering including a nearby circuit. When two or more pin numbers are indicated by the Check item party, check signal-line including a nearby circuit. If a power supply is switched on, go to does the focus move up and...
  • Page 53 CN301 IC101 3.3VA Pickup unit FE Gen. VHALF Photo detector IC201 3.3VD Focus servo 3.3VA CTL1 1.5V Focus actuater u-COM CTL2 Mute CONT. IC301 CN701 IC501 3.3VD 3.3VA IC502 1.5V IC201(109) : 500 mV/div AC IC201(109) : 2 V/div DC IC201(119) : 500 mV/div AC IC201(119) : 2 V/div DC IC301(34) : 500 mV/div AC...
  • Page 54 No audio output When the CD-player software using DAE play mode, Line-out is not enable Audio-play is not started only by setting Audio-CD. Note : When the circuit number is written, check parts and Please connect interface-cable and soldering including a nearby circuit. When two or more pin numbers are indicated by the use CD-player software.
  • Page 55: Block Diagram

    BLOCK DIAGRAM Optical Slide Spindle Pick up motor motor SF-HD67 Loading Spindle Focus Tracking Slide M63028FP motor motor actuator actuator motor Drive Drive Drive Drive Drive SST39SF020A Equalizer ( 256kB Flash Rom ) AN22022A (RF Amplifier) DVD PLL CD PLL System Control &...