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Troubleshooting Tips > Barco


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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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