Technicolor - Thomson LDK 20(S) technical manual Bar amplitude

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:

CVBS out

Adjust with:

ZR209

Required result:

5.3µS

Correct:
50mV	1µS
100
90
10
0%
	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:

CVBS out

Adjust with:

ZR216

Required result:

Minimum free-

running speed

I/Q bar amplitude

27. Adjust the I and Q bars for an amplitude of 286mV (40 IRE).

Measure at:

CVBS out

CVBS out

Adjust with:

ZR207

ZR201

Required result:

I-bar amplitude

Q-bar amplitude

Correct:
%				VOLT
120
100		R	cy	0.7
80	g		MG
			V
60		75
	YL	100	b	5
40
			U	0
20	yl		B	-5
				0
20		G	mg
43		r	CY	0.3
	I bar	Q bar

28. Switch off power and return encoder board to its position in the camera.

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-49