Technicolor - Thomson STUDIO CAMERA LDK 20(S) - Manual (Page 69)

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-43
Encoder Board NTSC
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 75Ohm to the CVBS output of the camera.
3. Switch on colour bar.
Black balance
4. Turn chroma potentiometer R4 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 ZR203 Smallest possible
ZR206 dot in centre of
vectorscope
6. Turn chroma potentiometer R4 on encoder board fully counterclockwise (zero chrominance).
CVBS amplitude
7. Adjust the CVBS gain potentiometer to obtain an output amplitude of 549mV (77 IRE).
Measure at: Adjust with: Required result: Correct:
CVBS out R14 549mV
0%
10
90
100
0.1V 10µS
VA+549mV
(77 IRE)
White bar amplitude
8. Adjust the white amplitude potentiometer to obtain an output of 714mV (100 IRE).
Measure at: Adjust with: Required result: Correct:
CVBS out ZR213 714mV
0%
10
90
100
0.1V 10µS
VA+714mV