Focus Adjustment; Screen G2 White Balance Adjustment - Sony TRINITRON PVM-2950QM Service Manual

PVM-2950Q/2950Q M
RM-854
3-3. FOCUS ADJUSTMENT
1. Receive a broadcast.
2. Adjust the picture to standard condition.
3. Adjust the focus volume of the flyback transformer until the
focus is ideal in the center of the screen.
If
the focus is
adjusted only to the center of the screen, a magenta ring will
appear on the screen. In such a case adjust the focus so that
is even on all parts of the screen.
Focus
Fig. 3-23
3-4. SCREEN G2 WHITE BALANCE ADJUSTMENT
G2 Adjustment (RV710)
1. Adjust the picture and brightness to standard.
2. Connect an oscilloscope to the cathode.
3. Remove CN305 connect pin l, 2, 3 to an external power
supply and adjust the cathode voltage to 176
±
2V.
4. Adjust RV710 (G2) by adjusting to a position that is just
prior to disappearance of the flyback line on the screen.
!WHITE BALANCE ADJUSTMENT
I
(Caution ; Refer to Page 38)
1. Input the gray scale to Line and select 9300 K on the
screen menu.
2. Set so that the user control contrast is minimum and the
brightness is reset.
3. St:t in the service mode and adjust so that the O IRE of the
gray scale is cut off and 10 IRE is slightly bright at a
brightness of 01.
4. Change the signal to the all-white signal and change the
signal level so that the center brightness is 10 nit.
Note:
If fine adjustments of the brightness are not possible with
the signal level, use contrast on the user control to adjust.
5. Use the G cutoff and B cutoff to adjust so that the color
temperature is 9300K+8 MPCD
±
2JND.
6. Set the all-white signal level to 100 IRE.
7. Use the G drive and B drive to adjust so that the color
temperature is 9300K+8 MPCD
±
2JND.
8. Adjust the brightness to 10 nit and confirm that the color
temperature is 9300K+8 MPCD
±
2JND. Repeat steps 3 to
7 to adjust when necessary.
9. Return to step (1) and check whether the brightness has
altered. If so, repeat steps 1-8 to adjust.
- 26 -
10. Input the gray signal of the Y color difference signal to
Line 3.
11. Change the signal level so that the center brightness is 10
nit.
12. Adjust the G cutoff and B cutoff so that the color
temperature is 9300K+8 MPCD
±
2JND.
13. Change the input to the RGB mode of Line 3 and input the
RGB gray signal.
14. Change the signal level so that the brightness in screen
center is 10 nit.
15. Adjust the G cutoff and B cutoff so that the color
temperature is 900K+8 MPCD
±
2JND.
16. Save the adjustment data.
17. Change the input to Line 1, change the signal to the gray
scale and go to the 6500K mode on the screen menu.
18. Carry out the same adjustments as in steps 2 to 8 so that the
color temperature is 6500K+8 MPCD
±
2JND.
19. Save the adjustment data.
20. Change the input to the component mode of Line 3 and
input the gray signal of the Y color difference signal.
21. Carry out exactly the same adjustments as in 11 and 12 so
that the color temperature is 6500K+8 MPCD
±
2JND.
22. Save the adjustment data.
23. Change the input to the RGB mode of Line 3 and input the
RGB gray signal.
24. Carry out exactly the same adjustments as in 14 and 15 so
that the color temperature is 6500K+8 MPCD
±
2JND.
25. Save the adjustment data.
26. Change the input to Line l, change the signal to the gray
scale and go to the 3200K mode on the screen menu.
27. Carry out exactly the same adjustments as in steps 2 to 8 so
that the color temperature is 3200K
±
2JND.
28. Save the adjustment data.
29. Change the input to the component mode of Line 3 and
input the gray signal of the Y color difference signal.
30. Carry out exactly the same adjustments as in steps 11 and
12 so that the color temperature is 3200K
±
2JND.
31. Save the adjustment data.
32. Change the input to the RGB mode of Line 3 and input toe
gray signal of RGB.
33. Carry out exactly the same adjustments as in steps 14 aad
15 so that the color temperature is 3200K
±
2JND.
34. Save the adjustment data.
35. Input a window signal of 100 IRE from Line I and go to
the 9300K mode. In addition, set the contrast a1td
brightness of the user control to the reset state.
36. Adjust with the picture control until the brightness at tile
center of the tube is 200
±
10 nit.
37. Save the adjustment data.
38. Change to the 6500K mode.
39. Adjust the picture adjustment so that the brightness at tile
center of the tube is 200
±
IO nit.
40. Save the adjustment data.
41. Change to the 3200K mode.
42. Adjust the picture adjustment so that the brightness at tit e
center of the tube is 140
±
10 nit.
43. Save the adjustment data.