Samsung SYNCM.400B Service Manual page 45

5 Alignment and Adjustments
PROCEDURE
1. Display the full white pattern.
2. Adjust VR101 (R-Gain) and VR103 (B-Gain) so
that the video is white.
(x = 0.283 ± 0.02 and y = 0.298 ± 0.02)
5-3-5 White Balance Fine Adjustment
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
X-Y coordinates:
PROCEDURE
1. Adjust the Contrast control so that the
brightness of the video is about 5 ft-L.
2. Check whether the white coordinates of the
video meet the specification above. If they do
not, adjust them so that they do.
3. Adjust the Contrast to maximum luminance.
4. Check whether the white coordinates still
meet the specification above. If they do not,
adjust them so that they do.
5-3-6 ABL Point Adjustment
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
PROCEDURE
Adjust VR501 (ACL) so that the brightness level is
40 ± 1 ft-L.
5-8
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
Full white pattern
x = 0.283 ± 0.02
y = 0.298 ± 0.02
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
Full white pattern
Maximum
Maximum
5-3-7 Focus Adjustment
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
PROCEDURE
1. Adjust the Focus VR on the FBT to display the
sharpest image possible.
2. Use Locktite to seal the Focus VR in position.
5-3-8 Luminance Uniformity Check
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
PROCEDURE
Measure luminance at nine points on the display
screen: top left corner, top center, top right corner,
center row left side, center, center row right side,
bottom left corner, bottom center, and bottom
right corner.
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
"H" character pattern
Maximum
Maximum
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
White flat field
Cut off point at 30 ft-L
CKA42*7L/5227L