Samsung CA17J Series, Service Manual

Page: 59 / 67

4 Alignment and Adjustments
4-6 CA17K*/CA17J*
CONFIDENTIAL
4-3-2 (d) ABL ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
Display image: Full white pattern
Brightness: Maximum
Contrast: Maximum
Figure 4-10. Full White Pattern
1. Check the ABL. If it is not within the
specifications, use the ABL controls to adjust
it. (32 ± 1 ft-L )
2. Select “@4: COLOR SAVE” to save the data.
3. Select “@6: ALL COLOR SAVE” to save the
CH2.
4-3-2 (e) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
Display image: Back raster pattern
Full White Pattern
X-Y Coordinates: x = 0.283 ± 0.02,
y = 0.298 ± 0.02
ABL Luminance Refer to 4-3-2(c)
Brightness: Maximum
Contrast: 5 ft-L, 24 ft-L
1. Check whether the color coordinates of the
back raster satisfy the above spec.
If they do not, return to 4-3-2 (a) and readjust
all settings.
2. Display a full white pattern.
3. Select “Geometry” in softjig menu.
4. Select “@7: 5-ft “ in right menu.
5. Check whether the white coordinates of the
video meet the above coordinates spec.
6. Select “@8: 24-ft “ in right menu.
7. Check whether the white coordinates of the
video satisfies the above spec.
If they do not, return to 4-3-2 (a) and readjust
all settings.
Select “Color” and click “@2: CHANNEL 2”
for color ajdustment for 6500K
Repeat the sequence of 9300K adjustment.
The luminance values the same as 9300K, but
the color coordinated of back raster and white
box are : x = 0.313
± 0.02 y = 0.329 ± 0.02
4-3-3 Luminance Uniformity Check
Luminance is considered uniform only if the ratio
of lowest to highest brightness areas on the screen
is not less than 7.5:10.
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
(1024 x 768)
Display image: White flat field
Brightness: Cut off point at 24 ft-L
Contrast: Maximum
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW