Adjustments
Technical Manual LDK 20(S) - Studio Camera
4-49
Encoder Board NTSC
Burst timing
23. Observe waveform monitor or oscilloscope and adjust the burst position so that it is 5.3µS from the leading
edge of the line synchronisation.
Measure at:
Adjust with:
Required result:
Correct:
CVBS out
ZR209
5.3µS
0%
10
90
100
50mV
1µS
t+5.3µs 178kHz
5.3µs
Genlock free-running preset
24. Remove genlock signal from camera.
25. Turn lock range potentiometer ZR215 fully counterclockwise.
26. Observe colour monitor, waveform monitor or vectorscope and adjust oscillator preset potentiometer for
minimum free-running.
Measure at:
Adjust with:
Required result:
CVBS out
ZR216
Minimum free-
running speed
I/Q bar amplitude
27. Adjust the I and Q bars for an amplitude of 286mV (40 IRE).
Measure at:
Adjust with:
Required result:
Correct:
CVBS out
ZR207
I-bar amplitude
20
40
R
60
80
0.7
100
120
20
43
0.3
g
YL
MG
cy
b
B
yl
G
r
CY
mg
75
100
U
V
0
0
5
-5
%
VOLT
CVBS out
ZR201
Q-bar amplitude
I bar Q bar
28. Switch off power and return encoder board to its position in the camera.
