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High Voltage/Power Supply Issues: General Information
There are a bunch of signals and
conditions that need to be present for
an image to appear on a Barco:
- Filament voltage: Heats the cathode
of the CRT to so that it emits electrons. No filament lit, no picture.
H deflection- makes up the raster in an E-W direction. Also called H sweep.
- V deflection: Makes up the raster in
a N-S direction. Also called V sweep. Lose either deflection signal, and the
Barco will shut down the HV section.
- HV/G2 section: The high voltage in a
CRT projector fires up the phosphor so that it can emit light. The G2 is
generated by the HV usually and provides control over the master brightness.
Lose either voltage and the screen will go dark or very dim.
- Video/chroma signal: Finally, you
need a video signal to the CRTs to produce a picture. All other
signals/voltages may be present, but without a video signal, the CRTs will
usually remain off.
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