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Table Of Contents - LG GWA-4164B Service Manual

Dvd/cd rewritable drive
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INTRODUCTION .......................................................................................................................................................................3
FEATURES................................................................................................................................................................................4
SPECIFICATIONS...............................................................................................................................................................5~14
LOCATION OF CUSTOMER CONTROLS .......................................................................................................................15~16
DISASSEMBLY .................................................................................................................................................................17~18
1. CABINET and CIRCUIT BOARD DISASSEMBLY ..........................................................................................................17
2. MECHANISM ASSY DISASSEMBLY..............................................................................................................................17
EXPLODED VIEW .............................................................................................................................................................19~20
MECHANICAL REPLACEMENT PARTS LIST ................................................................................................................21~23
GLOSSARY .............................................................................................................................................................................24
THE DIFFERENCES OF CD-R/CD-RW DISCS AND GENERAL CD-ROM.....................................................................25~29
1. Recording Layer ..............................................................................................................................................................25
2. Disc Specification ............................................................................................................................................................25
3. Disc Materials ..................................................................................................................................................................26
4. Reading Process of Optical Disc .....................................................................................................................................27
5. Writing Process of CD-R Disc .........................................................................................................................................28
6. Writing Process of CD-RW Disc ......................................................................................................................................28
7. Organization of the PCA, PMA and Lead-in Area ...........................................................................................................29
8. Function of PCA and PMA area ......................................................................................................................................30
9. OPC and ROPC ..............................................................................................................................................................30
10. Writing Process of DISC................................................................................................................................................31
THE DIFFERENCES OF DVD-R/RW, DVD+R/RW DISCS AND DVD-ROM....................................................................32~40
1. Recording Layer ..............................................................................................................................................................32
2. Disc Specification ............................................................................................................................................................33
3. Disc Materials ..................................................................................................................................................................33
4. Writing Pulse Waveform of DVD+R.................................................................................................................................36
5. Writing Pulse Waveform DVD+RW .................................................................................................................................38
LightScribe MEDIA...........................................................................................................................................................41~44
1. LightScribe Media............................................................................................................................................................41
2. Hardware Block Diagram of LightScribe Label Printing...................................................................................................42
3. MD Assy For LightScribe.................................................................................................................................................43
4. Optical Encoder Assy ......................................................................................................................................................44
DVD & CD DATA PROCESSING......................................................................................................................................45~48
1. Data Processing Flow......................................................................................................................................................45
2. Copy Protection and Regional Code Management Block ...............................................................................................46
3. About Prevention the DVD-ROm from to be copy ...........................................................................................................47
4. About the DVD-ROM Regional Code ..............................................................................................................................48
INTERNAL STRUCTURE OF THE PICK-UP....................................................................................................................49~51
1. Block Diagram of the Pick-up ..........................................................................................................................................49
2. Pick up Pin Assignment...................................................................................................................................................50
3. Signal detection of the P/U ..............................................................................................................................................51
DESCRIPTION OF CIRCUIT.............................................................................................................................................52~56
1. ALPC Circuit ....................................................................................................................................................................52
2. Focus/Tracking/Sled Servo Circuit ..................................................................................................................................53
3. Spindle Circuit .................................................................................................................................................................55
MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION.............................................................................57~74
TROUBLESHOOTING GUIDE ..........................................................................................................................................75~91
BLOCK DIAGRAM ............................................................................................................................................................92~94
CIRCUIT DIAGRAM ..........................................................................................................................................................95~97
PRINTED CIRCUIT BOARD DIAGRAM .........................................................................................................................98~101
ELECTRICAL REPLACEMENT PARTS LIST ......................................................................................................................102
CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM.

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