G2 Adjustment; White Balance Adjustment - Sony TRINITRON PVM-14N1A Service Manual

2. Insert the wedges into the DY and CRT funnel face to fix the
DY. The number and position of the wedges are shown in the
figure below.
Position of 14 inch wedge Position of 20 inch wedge
3. The pattern below can not be corrected by turning the neck.
*Gun rotation
The beam is twisted at both
sides on the X axis and Y axis.
*HCR large (small)
At both sides of the screen the
G raster horizontal compo-
nent is wider (narrower) than
those of the R and B rasters.
*VCR large (small)
At both sides of the screen,
the G raster vertical compo-
nent is wider (narrower) than
those of the R and B rasters.
3-8. G2 ADJUSTMENT
1. Input the 625 or 525 all black signal.
2. Select the voltage shown below for each R, G, and B cath-
odes.
14 inch—>DC175.0V
20 inch—DC160.0V
3. Adjust G2 VR so that the raster is slightly luminous.
3-9. WHITE BALANCE ADJUSTMENT
This manual performs control of the white balance using the mi-
crocomputer, that not only the white balance adjustment of actual
images, but also the data adjustment and saving for controlling the
microcomputer are needed.
To adjust the white balance, first adjust the white balance of the
actual images using ; : and ;
' [B DRIVE]. Then adjust so that the
reference data and , the
microcomputer performs control, are together into the center of 0-
FF (hexadecimal)...
After that, save the adjusted [DRIVE LIMIT], setting the reading
of CO on the C/O REF screen to [R C/O REF 1G C/O REF], [B C/
O REF] and saving them are needed.
For measuring equipment, use a color analyser (for example from
Minolta, etc.).
For signals, use a gray signal (Figure 1) for the cutoff adjustment
and a window signal (Figure 2) for the driving adjustment.
(Figure 1)
(Figure 2)
0.7 Vp-p
20 psec
1. Set contrast 50 and other settings to the standard level.
2. Set the LINE-A input.
3. Enter the service mode.
4. Input a gray signal (Figure 1) to LINE-A.
5. Adjust |G C/O] so that the luminance becomes 3+0.2 nit.
6. Adjust and [B C/O] so that the white balance becomes
the color temperature shown in Table 2 as below.
7. Repeat 5 to 6 until the luminance and color temperature meet
the specification.
8. Input the window signal (Figure 2) to LINE-A.
9. Adjust so that the luminance becomes 12041 nit.
10. Adjust and so that the white balance
becomes the color temperature shown in Figure 2.
11. Repeat 9 to 10 until the luminance and color temperature meet
the specification.
12. Cutoff is shifted when drives are changed. Therefore, repeat
4 to 11 for the drive and cutoff until the luminance and color
temperature meet the specification.
13. Save the data.
Table 2
Color Temp D65 + 1 IND