LG LRM-519 Service Manual page 65

ELECTRICAL TROUBLESHOOTING GUIDE
WAVEFORMS
.................................................................................................................................................................4-16
1. POWER & RESET SIGNAL .......................................................................................................................................4-16
2. MAIN CLOCK1 FOR IC202 (16.9MHZ)......................................................................................................................4-16
3. SDRAM CLOCK .........................................................................................................................................................4-17
4. TRAY OPEN/CLOSE SIGNAL 1.................................................................................................................................4-17
5. TRAY OPEN/CLOSE SIGNAL 2.................................................................................................................................4-18
6. SLED MOVE SIGNAL 1 .............................................................................................................................................4-18
7. SLED MOVE SIGNAL 2 .............................................................................................................................................4-19
8. FOCUS SEARCH SIGNAL.........................................................................................................................................4-19
9. LASER TURN ON SIGNAL ........................................................................................................................................4-20
10. DISC TYPE JUDGEMENT WAVEFORM (CD SERIES) ..........................................................................................4-21
11. DISC TYPE JUDGEMENT WAVEFORM (CD&CD-R)..............................................................................................4-21
12. DISC TYPE JUDGEMENT WAVEFORM (CD-RW)..................................................................................................4-22
13. DISC TYPE JUDGEMENT WAVEFORM (DVD SERIES) ........................................................................................4-22
14. DISC TYPE JUDGEMENT WAVEFORM (DVD_SINGLE&R) ..................................................................................4-23
15. DISC TYPE JUDGEMENT WAVEFORM (DVD _DUAL)..........................................................................................4-23
16. DISC TYPE JUDGEMENT WAVEFORM (DVDRW) ................................................................................................4-24
17. SPINDLE WAVEFORM1 ..........................................................................................................................................4-24
18. SPINDLE WAVEFORM2 ..........................................................................................................................................4-25
19. FOCUS ON SIGNAL(CD).........................................................................................................................................4-25
20. FOCUS ON SIGNAL(CD))........................................................................................................................................4-26
21. FOCUS ON SIGNAL(DVD) ......................................................................................................................................4-26
22. FOCUS ON SIGNAL (DVD) .....................................................................................................................................4-27
23. TRACK OFF SIGNAL(CD) .......................................................................................................................................4-27
24. TRACK OFF SIGNAL(DVD) .....................................................................................................................................4-28
25. TILT DRIVER SIGNAL(DISC READING) .................................................................................................................4-28
26. RF WAVEFORM(DVD) .............................................................................................................................................4-29
27. RF WAVEFORM(CD) ...............................................................................................................................................4-29
28. WOBBLE(DVD-R/RW)_READING ...........................................................................................................................4-30
29. WOBBLE(DVD+R/RW)_READING&WRITING =>X1 SPEED .................................................................................4-30
30. LD ENABLE(DVD) ....................................................................................................................................................4-31
31. LD ENABLE(CD) ......................................................................................................................................................4-31
32. LASER POWER(READING)_DVD+RW ...................................................................................................................4-32
33. LASER POWER(ERASE)_DVD+RW .......................................................................................................................4-32
34. LASER POWER(WRITING)_INITIAL STATE ...........................................................................................................4-33
35. LASER POWER(WRITING)_PROCESSING ...........................................................................................................4-33
THE DIFFERENCE OF DVD-R/RW, DVD+R/RW DISCS AND DVD-ROM
1. RECORDING LAYER .................................................................................................................................................4-34
2. DISC SPECIFICATION...............................................................................................................................................4-35
3. DISC MATERIALS ......................................................................................................................................................4-34
4. ORGANIZATION OF THE INNER DRIVE AREA, OUTER DRIVE AREA,
LEAD-IN ZONE AND LEAD-OUT ZONE....................................................................................................................4-39
5. ALPC(AUTOMATIC LASER POWER CONTROL) CIRCUIT .....................................................................................4-43
HOW TO USE TEST TOOL
BLOCK DIAGRAMS
1. OVERALL BLOCK DIAGRAM ....................................................................................................................................4-51
2. DSP BLOCK DIAGRAM .............................................................................................................................................4-52
3. µ-COM BLOCK DIAGRAM .........................................................................................................................................4-53
4. RF BLOCK DIAGRAM................................................................................................................................................4-54
CIRCUIT DIAGRAMS
1. RF1 CIRCUIT DIAGRAM ..........................................................................................................................................4-55
2. DSP CIRCUIT DIAGRAM ...........................................................................................................................................4-57
3. µ-COM CIRCUIT DIAGRAM.......................................................................................................................................4-59
CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD .....................................................................................................................................................4-63
2. MAIN P.C.BOARD .....................................................................................................................................................4-65
SECTION 4
RL-05 LOADER PART
CONTENTS
.......................................................................................................................................4-44
...................................................................................................................................................4-51
..................................................................................................................................................4-55
.....................................................................................................................................4-61
..............................................................................................................................4-63
......................................................................................................4-2
..............................................4-34