NEC MultiSync 3D JC-1404HME Service Manual page 23

2 Contrast control : Fully clockwise
Brightness control : Fully counterclockwise
3 Adjust VR901, VR902 and VR903 so that the output voltage is 38Vp-p.
After Adjusting, check the Vp-p again and readjust if they do not confirm to the settings.
_I I I
i
38Vp-p
!
b) SUB CONT. VR adjustment
1 Contrast control : Fully counterclockwise
Brightness control : Fully counterclockwise
2 Adjust VR904 so that TP902 (GREEN OUT) output is 10Vp-p.
After adjusting, check that TP901 (RED OUT) and TP903 (BLUE OUT) outputs are 10Vp-p
±0.5Vp-p.
If not, fine-adjust VR904 so that the R, G and B outputs are within the range of 10Vp-p
±0.5Vp-p.
(3) Cut-off Adjustment (All Black Signal)
Contrast control : Fully counterclockwise
Brightness control : Fully counterclockwise
al 1 Short TP551 and the ground. (chassis)
2 Short TP401 and the ground. (chassis)
3 As the screen VR is turned gradually clockwise, a single color will appear as a horizontal line.
This color is the reference color for the cut-off adjustment.
bl Turn the bias VRs for the other color than the reference color until bright as the reference
color.
cl 1 Remove the short between TP401 and the ground. (chassis)
Otherwise, replace VR401 original position (voltage of pin 4 IC501 is 6V±0_1V).
2 Remove the short between TP551 and the ground. (chassis)
NOTE: Perform the cut-off adjustment in as dark a place as possible to make the white tracking
which follows better.
(4) SUB BRIGHT VR Adjustment
a) Receive signal 8 (All black signal).
Contrast control : Fully counterclockwise
Brightness control : Fully clockwise, so that there is only back raster on the screen.
bl Turn SUB BRIGHT VR for the other color than the reference color of (3) Cut-off Adjustment
and adjust so that back raster become to be white.
(5) Fine Adjustment of White Balance
Color temperature: Center X
=
0.310
Y
=
0.325
The color should be white with a slightly blue tinge.
al Receive signal 8 (VGA 400 lines) H. gray scale (16 gradations).
bl Contrast control : Fully counterclockwise
Brightness control : Fully clockwise
Check that the white balance is proper for all gradations.
If not, fine adjust to make it white with SUB BRIGHT VR for the other color than the refer-
ence color.
cl Contrast control : Fully clockwise
Brightness control : At a point where no back raster aP.pears
Check that the white balance is proper for all gradations.
If not, fine adjust to make it white with GAIN VR for the other color than the reference color.
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