LG RC-185 Service Manual page 118

ELECTRICAL TROUBLESHOOTING GUIDE
THE DIFFERENCE OF DVD-R/RW, DVD+R/RW DISCS AND DVD-ROM
1. RECORDING LAYER .................................................................................................................................................5-15
2. DISC SPECIFICATION...............................................................................................................................................5-16
3. DISC MATERIALS ......................................................................................................................................................5-16
4. ORGANIZATION OF THE INNER DRIVE AREA, OUTER DRIVE AREA, LEAD-IN ZONE AND
LEAD-OUT ZONE.......................................................................................................................................................5-20
HOW TO USE TEST TOOL
1. ALPC MEASUREMENT SYSTEM..............................................................................................................................5-24
2. ALPC PROGRAM ......................................................................................................................................................5-24
3. EXECUTE ALPC PROGRAM.....................................................................................................................................5-25
4. OPTICAL POWER SETTING .....................................................................................................................................5-27
5. CONFIRM OPTICAL POWER SETTING PARAMETER ............................................................................................5-28
6. OPTICAL POWER SETTING PARAMETER RANGE ................................................................................................5-29
7. ATTACHMENT. OPTICAL POWER MEASUREMENT ...............................................................................................5-30
INTERNAL STRUCTURE OF THE PICK-UP
1. BLOCK DIAGRAM OF THE PICK-UP(LPC-812R) ...................................................................................................5-31
2. PICK UP PIN ASSIGNMENT .....................................................................................................................................5-32
3. SIGNAL DETECTION OF THE P/U ...........................................................................................................................5-33
DESCRIPTION OF CIRCUIT
1. ALPC (AUTOMATIC LASER POWER CONTROL) CIRCUIT ....................................................................................5-34
2. FOCUS/TRACKING/SLED SERVO CIRCUIT ............................................................................................................5-35
3. SPINDLE SERVO CIRCUIT .......................................................................................................................................5-37
MAJOR IC INTERNAL BLOCK DIAGRAM
LIC121 (AN22113A) : FEP(RF) ANALOG SIGNAL PROCESSOR ................................................................................5-38
IC301 (BD7956FS) : CD-ROM/DVD-ROM 7CH POWER DRIVER ...............................................................................5-41
CIRCUIT DIAGRAMS
1. DSP CIRCUIT DIAGRAM ...........................................................................................................................................5-42
2. RF CIRCUIT DIAGRAM .............................................................................................................................................5-44
3. DRIVE CIRCUIT DIAGRAM .......................................................................................................................................5-46
CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD(TOP VIEW) .................................................................................................................................5-50
2. MAIN P.C.BOARD(BOTTOM VIEW) .........................................................................................................................5-52
SECTION 5
RS-01A LOADER PART
CONTENTS
.......................................................................................................................................5-24
.....................................................................................................................................5-34
..................................................................................................................................................5-42
.....................................................................................................................................5-48
..............................................................................................................................5-50
......................................................................................................5-2
......................................................................................................5-31
.........................................................................................................5-38
..............................................5-15