Technicolor - Thomson LDK 20(S) technical manual Burst phase

Encoder Board NTSC

I / Q 90° phase

16.Connect MP7 on the encoder board to ground.

17.With the phase potentiometer on the vectorscope, place the I vectors along the I-axis of the graticule.

Measure at:

Adjust with:

Required result:

Correct:
IRE
120			0%
100		R	12.5%
80	I	MG
60		Q	5
	YL
40		75 100
			0
20		B	-5
			75%
20		G
		CY
40			100%

18.On the encoder board disconnect MP7 from ground and connect MP8 to ground.

19.Adjust the phase of the Q vectors with L8 so that they lie along the Q-axis of the graticule.

Measure at:

CVBS out

Adjust with:

L8

Required result:

Correct:
IRE
120			0%
100		R	12.5%
80	I	MG
60		Q	5
	YL
40		75 100
			0
20		B	-5
			75%
20		G
		CY
40			100%

20. Repeat steps 16. to 20. until the best results are obtained.

BURST ADJUSTMENTS

Burst phase

21. Adjust the burst phase potentiometer to place the burst vector along the horizontal axis

Measure at:

CVBS out

Adjust with:

ZR211

Required result:

Correct:
IRE
120			0%
100		R	12.5%
80	I	MG
60		Q	5
	YL
40		75 100
			0
20		B	-5
			75%
20		G
		CY
40			100%

Burst amplitude

22. Adjust the burst amplitude potentiometer to obtain a burst amplitude of 286mV (40 IRE).

Measure at:

CVBS out

Adjust with:

ZR210

Required result:

286mV

(40 IRE)

Correct:
0.1V	2µS
100
90
10
0%
	VA+286mV

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-47