Technicolor - Thomson LDK 20(S) Burst amplitude, Burst timing, Genlock free-running preset

Encoder Board PAL

Burst amplitude

19. Adjust the burst amplitude potentiometer to obtain a burst amplitude of 300mV.

Measure at:

CVBS out

Adjust with:

ZR210

Required result:

300mV

Correct:
0.1V	2µS
100
90
10
0%
	VA+300mV

Burst timing

20.Observe waveform monitor or oscilloscope and adjust the burst position so that it is 5.6µS from the leading edge of the line synchronisation.

Measure at:

CVBS out

Adjust with:

ZR209

Required result:

Correct:
50mV	1µS
100
90
10
0%
	t+5.6µs 178kHz

Genlock free-running preset

21.Remove genlock signal from camera.

22.Turn lock range potentiometer ZR215 fully counterclockwise.

23.Observe colour monitor, waveform monitor or vectorscope and adjust oscillator preset potentiometer.

Measure at: CVBS out

Adjust with: ZR216

Required result:

Minimum freerunning speed

Sc-H phase relationship

24.Switch vectorscope to internal synchronisation.

25.Adjust Sc-H phase potentiometer for 180°.

Measure at:

CVBS out

Adjust with:

ZR217

Required result:

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

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

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-41