THOMSON STUDIO CAMERA LDK 20(S), Техническое руководство

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Adjustments Technical Manual LDK 20(S) - Studio Camera 4-17
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: Required result:
MP2 ZL4 +2.5V DC level
Output amplitude
4. Test sawtooth on.
5. Adjust Y output amplitude.
Measure at: Adjust with: Required result: PAL NTSC
X17A-11 ZR92 +1400mV PAL
0%
10
90
100
0.2V 10µS
VA+1400mV
0%
10
90
100
0.2V 10µS
VA+1428mV
+1428mV NTSC
6. Adjust Y sync. output amplitude.
Measure at: Adjust with: Required result: PAL NTSC
X17A-11 ZR85 -600mV PAL
0%
10
90
100
0.2V 10µS
VA-600mV
0%
10
90
100
0.2V 10µS
VA-572mV
-572mV NTSC
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: Required result: Correct: Incorrect:
CVBS out ZR91
0.1
0.2
0.4
0.5
0.6
0.7
0.8
0.9
10
11
0.1
0.2
0.4
0.5
0.6
0.7
0.8
0.9
10
11