LG Electronics GSA-4165B, GSA-4167B, GSA-4168B service manual

Contents

Main TABLE OF CONTENTS CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM. INTRODUCTION 1. Support feature and writable disc FEATURES 1 General 2. Supported disc formats 3. Supported write method 4. Performance 5. Audio SPECIFICATIONS 1. SYSTEM REQUIREMENTS 2. SUPPORTING OPERATING SYSTEM 3. DRIVE PERFORMANCE Page 4. Quality and Reliability 5. POWER REQUIREMENTS 6. AUDIO PERFORMANCE 7. Acoustic noise 8. Dimensions LOCATION OF CUSTOMER CONTROLS Front Panel Digital Audio Output Connector Jumper Connector Power Connector Rear Panel 1. CABINET and CIRCUIT BOARD DISASSEMBLY 1-1. Bottom Chassis Emergency Eject Hole 1-2. Front Bezel Assy DISASSEMBLY Page A02 EXPLODED VIEW 4 A01 A03 3 GLOSSARY The differences of CD-R/CD-RW discs and General CD-ROM 1. Recording Layer 3~11T 2. Disc Specification Recordable CD has a wobbled pre-groove on the surface of disc for laser beam to follow track. 3. Disc Materials 1) CD-ROM disc 2) CD-R disc 22 3) CD-RW Disc 4. I 11 I G I L I I3Itop Reading process of Optical Disc Focusing Lens 5. Writing Process of CD-R Disc 6. Writing process of CD-RW Disc 7. Organization of the PCA, PMA and Lead-in Area 1) Layout of CD-ROM disc 2) Layout of CD-R/RW disc 8. Function of PCA and PMA area 1) PCA (Power Calibration Area) HF Signal 2) PMA (Program Memory Area) 9. OPC and ROPC 10. Writing Process of DISC The differences of DVD-R/RW, DVD+R/RW discs and DVD-ROM 1. Recording Layer 2. Disc Specification 3. Disc Materials 1) DVD-ROM 2) Recording format using organic dye material (DVD-R/DVD+R) 3) Recording format using phase-change recording material (DVD-RW/DVD+RW) 4. Writing Pulse Wave Form of DVD+R NRZI T = 3 2Tw N = 3 : only the top pulse(T ), first pulse lead-time dT , dT NRZI T > 4 2) 2st Method : Using Blocked Write Strategy 3T mark 4T mark 5T mark Etc. > 5. Writing Pulse Wave Form of DVD+RW 6. Organization of the Inner Drive Area, Outer Drive Area, Lead-in Zone and Lead-out Zone 1) Layout of DVD-ROM disc Data Zone Lead-in Zone Read Only Disc Lead-out Zone 3) Layout of DVD+RW disc LightScribe Media 1. LightScribe Media 2. Hardware Block Diagram of LightScribe Label Printing Page 4. Optical Encoder Assy Codewheel Direction of radial play FFC 3PIN Encoder PCB Schematic of Enc PCB DVD & CD DATA PROCESSING 1. Data Processing Flow DVD P-up Data 2. Copy Protection and Regional Code Management Block 3. About Prevention the DVD-ROM from to be copy 4. About the DVD-ROM Regional Code Regional code DISC ROM - DRIVE MPEG-2 BOARD VGA CARD MONITOR 1 21 INTERNAL STRUCTURE OF THE PICK-UP 1. Block Diagram of the PICK-UP(HOP-7632TS) IC2(LDD) IC2(FM) F3 F2 E4 E1 2. Pick up Pin Assignment 3. Signal detection of the P/U Optical Pick-up SCLK, SDATA, WDEN FsDAC DESCRIPTION OF CIRCUIT 1. ALPC (Automatic Laser Power Control) Circuit 1-1. Block Diagram 1-2. ALPC (Automatic Laser Power Control) Circuit 2. Focus Circuit 2-1. Block Diagram IC601 R2S30202FP Disc Motor unit Optical Pick-up HOP-7632TS 3. Tracking & Sled Circuit 3-1-1. Block Diagram (Tracking Following) R8J32007 Motor unit Optical IC101 R2S35002 3-1-2. Block Diagram (Seek) Motor unit Optical R8J32007 + - 3-2-1. Tracking Servo 3-2-2. Sled Servo 4. Spindle Circuit 4-1-1. Block Diagram(FGCAV Servo) Motor unit Optical R8J32007 4-2-1. Block Diagram (Wobble CLV Servo) Disc Motor unitOptical Pick-up HOP-7632TS - IC101 R2S35002 - + R2S35002 (TOP VIEW) Block Diagram Pick I/F MUX WRF AGC2 COMP Pin Functions Page Page IC301 (R8J32007FPV) : Encoder, Decoder & DSP Singal Processor 1.1 Pin Layout R8J32007 Top View 1.2 Block Diagram 1.3 Pin Table 1.4 Pin Functions Page Page Page Page Page Page Pin Function IC601 (R2S30202FP) : SPINDLE MOTOR AND 6CH ACTUATOR DRIVER Package outline : 42 PIN POWER SSOP (42P9R-K) Pin Layout R2S3 0202FP Block Diagram M hopperPWM SINCurrent chopperPWM Input/Output circuit diagram TROUBLESHOOTING GUIDE (01) Laser Power Adjust (using RD Power/WR Power/Erase Power) (05) Focus Amp. Adjust for DVD-Dual (02) High Frequency/NRZI skew Adjust (03) Data Slice/Equalizer Boost/Raw Slice/ Equalizer Frequency Adjust (06) Focus Amp. and Total Amp. Adjust (07) Tracking Amp. Adjust (08) Servo Loop Gain Adjust (09) Unwritten Slice Level Adjust for DVD-RAM (10) Focus Offset Adjust for DVD-ROM, CD-R/RW (11) Focus Offset Adjust for DVD-RAM (PID Amp) (12) Focus Offset Adjust for DVD-RAM (Data Error pulse) (14) Tilt Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW (13) Tilt Adjust for DVD-RAM (15) Focus Deviation Adjust (16) Focus Offset Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW (17) Lens Sensitivity Adjust (18) Spindle Offset Adjust (20) Focus Offset Adjust for DVD-R/RW, DVD+R/RW(DID) (19) ADIP BPF/Read Timing Adjust for DVD+R/RW (21) RTZ TimeOut Fail (22) Focus Servo/Tracking Servo Fail Detail Error Code & Fail Analysis 1. Laser Power Initial Adjust 2. Adjusting Error during Disc Load Sequence (Lead in Error) Page Page Page 3. Loading Sequence Error (Lead in Error) 12V JR6 Power Supply System Diagram 85 86 5V in PCB Poor Analysis - Check list Page Page Page BLOCK DIAGRAM 12V GND 5V Host IDE