Video Miscellaneous Board - THOMSON STUDIO CAMERA LDK 20(S) Technical Manual

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: Adjust with:
MP2 ZL4
Output amplitude
4. Test sawtooth on.
5. Adjust Y output amplitude.
Measure at: Adjust with:
X17A-11 ZR92
6. Adjust Y sync. output amplitude.
Measure at: Adjust with:
X17A-11 ZR85
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: Adjust with:
CVBS out ZR91
Adjustments
Required result:
+2.5V DC level
Required result: PAL
+1400mV PAL
+1428mV NTSC
100
90
10
0%
Required result: PAL
-600mV PAL
-572mV NTSC
100
90
10
0%
Required result: Correct:
11
10
0.9
0.8
0.7
0.6
0.5
0.4
0.2
0.1
Technical Manual LDK 20(S) - Studio Camera
NTSC
0.2V 10µS
VA+1400mV
NTSC
0.2V 10µS
VA-600mV
Incorrect:
0.2V 10µS
100
90
10
0%
VA+1428mV
10µS
0.2V
100
90
10
0%
VA-572mV
11
10
0.9
0.8
0.7
0.6
0.5
0.4
0.2
0.1
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