LG GWA-4161B Service Manual page 72

C. Laser Power Setup
1. Remove disc on the tray.
2. Select ALPC/OPC on the menu bar, and then select Setup Laser Power menu.
3. First, select CD and setup wave length of LD Power meter (780nm)
(Wave Length : CD(780nm), DVD(660nm), Measure Range : 0.01mW unit).
4. Click VRDC button on the Laser Power Setup window. Laser beam will be emitted from LD.
5. Measure LD Power with LD Power meter. Type the result in the blank(Read Power box).
ex) 1.76mW -> 176, 0.88 -> 88)
6. Click VWDC button and follow above step 6. But VWDC result should be filled in the Write Power box.
ex) 8.74mW -> 874, 4.89 -> 489
7. Click Setup button, and Result will be displayed with OK or NG.
8. Select DVD and change wave length of LD Power meter (660nm).
9. Follow above step 5, 6, 7, 8.
10.Close Laser Power Setup window.
[Laser Power Setup window]
[CD Laser Power Setup Result]
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[Laser Power Setup Frame]
[DVD Laser Power Setup Result]