THOMSON LDK 5411, Техническое руководство, Страница: 23 / 42

Adjustments Technical Manual LDK 5411 - Betacam SP Adapter
3-5
Encoder Board PAL
Set-up
1. Switch off power. Place encoder board on service extender. Genlock camera with black burst signal. Switch
on power.
2. Connect oscilloscope via a vectorscope terminated with 75 Ohm to the CVBS output.
3. Switch on colour bar.
Black balance
4. Turn chroma potentiometer R171 on encoder board fully clockwise (max. chroma).
5. Adjust the I and Q balance potentiometers for minimum unbalance in black.
Measure at: Adjust with: Required result:
CVBS out ZR124 Smallest possible
ZR324 dot in centre of
vectorscope
CVBS offset
6. Adjust the CVBS offset potentiometer to place the black bar at 0 Vdc.
Measure at: Adjust with: Required result: Correct:
CVBS out ZR529 Black bar = 0 Vdc
CVBS amplitude
7. Adjust the CVBS gain potentiometer to obtain an output amplitude of 700mV.
Measure at: Adjust with: Required result: Correct:
CVBS out R542 700mV
R-Y amplitude
8. Adjust the R-Y potentiometer to obtain an output amplitude of 1050 mV
Measure at: Adjust with: Required result: Correct:
X21-8A R314 1050mV
0.1
0.2
0.4
0.5
0.6
0.7
0.8
0.9
10
11
0%
10
90
100
0.2V 10µS
VA+1050mV