Samsung CT331EBZX, Руководство по обслуживанию

Страница: 15 / 63

Alignment and Adjustments
4-4 Samsung Electronics
4-2-8 Sub-Contrast Adjustment
1. Input a gray scale pattern. Use a pattern
generator (PM5518).
2. Short D208 to switch off the ABL feed-back.
3. Check CN201 R-OUT with an oscilloscope.
4. Set RC, BC, GC data to 0 in the Service Mode.
5. Adjust SCT to 2.40 ± 0.1Vp-p
6. Remove the short across D208 and restore
ABL.
4-2-9 Sub-Tint Adjustment
1. Input a rainbow pattern.
2. Check CN201 B-OUT with an oscilloscope.
3. Adjust STT in the service mode until the 6th
peak is the highest and the 5th and 7th peaks
have equal heights.
4-2-10 Sub-Color Adjustment
1. Do sub-color adjustment after the Sub-
Contrast and Sub-Tint adjustments.
2. D208 should still be shorted. The ABL should
still be switched OFF.
3. Input a color bar pattern. Use a pattern gen-
erator (PM5518).
4. Check CN201 R-OUT (use an oscilloscope).
5. Ensure that the RC, GC and BC data are 0.
BG are 140 and GG should be 90.
6. Adjust SCR to 2.4 ± 0.1Vp-p (black and
red levels).
7. Remove the short across D208 and restore
ABL.
2.5V 0.1Vpp
+ _
1
2
3
4
5
6
7 8
9
10
2.4V 0.1Vpp
+ _