Sharp VL-H870U Service Manual page 39

VL-H870U
VL-H875U
VL-H890U
4. Burst gain adjustment
Measuring instrument Oscilloscope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Measure the burst signal level on the oscilloscope. Using the
address 1F9, adjust the burst amplitude to 286mVp-p.
5. White balance adjustment
Measuring instrument Vector scope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Adjust the spot to the center of vector scope (R-Y : 0%, B-Y : 0%)
using address 010 and 012.
6. Color gain adjustment
Measuring instrument Vector scope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Using the address 0DD, adjust the R level to a burst ratio of 1.2.
With the address 0DB, adjust the B level to a burst ratio of 1.0.
2) Using the address 0D7, adjust the R phase to 100°. With the
address 0D9, adjust the B phase to 344°.
3) Repeat the above steps 1) and 2).
7. Out door white balance adjustment
Measuring instrument Vector scope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Attach the color temperature conversion filter (JiGHOYA-LB165) to the front of the lens.
2) Using the addresses R-OUT DOOR 016 and B-OUT DOOR 018, adjust the spot to the center.
3) Take off the color temperature conversion filter.
When you have finished, write FF to the adress 1FE to exit camera signal
adjustment mode.
None
—
VIDEO OUT (Terminated in 75 Ω)
1F9
286mVp-p
Gray scale
—
VIDEO OUT (Terminated in 75 Ω)
R-W/B 010, B-W/B 012
R-W/B 0 % ± 3 %
B-W/B 0 % ± 3 %
Color bar chart
—
VIDEO OUT (Terminated in 75 Ω)
R GAIN 0DD
B GAIN 0DB
R MAT 0D7
B MAT 0D9
R GAIN; Burst ratio 1.2 ± 0.1
B GAIN; Burst ratio 1.0 ± 0.1
100 ± 2°
R MAT;
344 ± 2°
B MAT;
Gray scale
—
VIDEO OUT (Terminated in 75 Ω)
R-OUT DOOR 016
B-OUT DOOR 018
R-OUT DOOR; 0 ± 3 %
B-OUT DOOR; 0 ± 3 %
Burst
6-15
R-Y
Spot
B-Y
Center point
R-Y
R spot
R level
100°
344°
B-Y
B spot
B level
R-Y
Spot
B-Y
Center point
VL-H870U
VL-H875U
VL-H890U
286mVp-p