Technicolor - Thomson LDK 20(S) - page 73

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-47
Encoder Board NTSC
I / Q 90° phase
16. Connect MP7 on the encoder board to ground.
17. With the phase potentiometer on the vectorscope, place the I vectors along the I-axis of the graticule.
Measure at: Adjust with: Required result: Correct:
20
40
R
60
80
12.5%
100
120
20
40 100%
YL
MG
B
G
CY
75100
I
Q
75%
0
5
-5
IRE 0%
18. On the encoder board disconnect MP7 from ground and connect MP8 to ground.
19. Adjust the phase of the Q vectors with L8 so that they lie along the Q-axis of the graticule.
Measure at: Adjust with: Required result: Correct:
CVBS out L8
20
40
R
60
80
12.5%
100
120
20
40 100%
YL
MG
B
G
CY
75100
I
Q
75%
0
5
-5
IRE 0%
20. Repeat steps 16. to 20. until the best results are obtained.
BURST ADJUSTMENTS
Burst phase
21. Adjust the burst phase potentiometer to place the burst vector along the horizontal axis
Measure at: Adjust with: Required result: Correct:
CVBS out ZR211
20
40
R
60
80
12.5%
100
120
20
40 100%
YL
MG
B
G
CY
75100
I
Q
75%
0
5
-5
IRE
0%
Burst amplitude
22. Adjust the burst amplitude potentiometer to obtain a burst amplitude of 286mV (40 IRE).
Measure at: Adjust with: Required result: Correct:
CVBS out ZR210 286mV
0%
10
90
100
0.1V 2µS
VA+286mV
(40 IRE)