Service manual

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