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LG GWA-4164B Service Manual page 85

Dvd/cd rewritable drive
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C. Laser Power Setup
1. Remove disc on the tray.
2. Select ALPC/OPC on the menu bar, and then select Setup Laser Power(Manual) 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) 1.44mW -> 144, 0.99mW -> 99)
6. Click NMP button and measure LD Power with Power meter. Type the result in the blank(R NMP Power
box).
ex) 16.45mW -> 1645, 12.08mW -> 1208
7. Click MP button and measure LD Power with Power meter. Type the result in the blank(RW Erase Power
box).
8. Click ERASE button and measure LD Power with Power meter. Type the result in the blank(RW Erase
Power box).
9. Click LD Off button and then click Setup button, and result witll be displayed with OK or NG.
10. Select HC_CD and then click HC button.
11. Measure LD Power with Power meter. Type the result in the blank (HC Power).
12. Click LD Off button and then click Setup button, and result will be displayed with OK or NG.
13. Select DVD and change wave length of LD Power meter (660nm).
14. Follow above step 5, 6, 7, 8, 9.
15. Close Laser Power Setup window.
[Laser Power Setup window]
[Laser Power Setup Frame]
89

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