Technicolor - Thomson LDK 20(S) VF sync. oscillator, Output amplitude, B-Y white balance

Video Miscellaneous Board

1. Place Video Miscellaneous Board on service extender.

VF sync. oscillator

2.Test sawtooth off.

3.Adjust VF sync. frequency.

Measure at: MP2

Adjust with: ZL4

Required result: +2.5V DC level

Output amplitude

4.Test sawtooth on.

5.Adjust Y output amplitude.

Measure at: X17A-11

Adjust with: ZR92

Required result: +1400mV PAL +1428mV NTSC

PAL		NTSC
0.2V	10µS	0.2V	10µS
100		100
90		90
10		10
0%		0%
	VA+1400mV		VA+1428mV

6. Adjust Y sync. output amplitude.

Measure at:	Adjust with:	Required result:
X17A-11	ZR85	-600mV PAL
		-572mV NTSC

PAL
0.2V	10µS
100
90
10
0%
	VA-600mV

NTSC
0.2V	10µS
100
90
10
0%
	VA-572mV

R-Y / B-Y white balance

7.Test sawtooth off

8.Colour bar on.

9.Connect oscilloscope, via a vectorscope terminated with 75 Ohm, to the CVBS output of the camera and adjust for a minimum unbalance in white.

Measure at:

CVBS out

Adjust with:

ZR91

Required result:

Correct:

11

10

0.9

0.8

0.7

0.6

0.5

0.4

0.2

0.1

Incorrect:

11

10

0.9

0.8

0.7

0.6

0.5

0.4

0.2

0.1

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-17