Glossary
Cold Mirror | Mirror that absorbs infrared light so that its reflection contains |
| only "cold' light that does not transmit appreciable heat. As a |
| result of this absorption of infrared heat radiation, "cold" |
| mirrors get quite hot. |
Composite Video | Means of transmission sending the complete video signal |
| consisting of chrominance, luminance and the sync signals. It |
| is the NTSC standard. |
Contrast | The ratio between the dark and light areas of a television |
| picture, setting white at 100%. Used with Brightness |
| adjustment for best picture display. |
Convergence | The process of controlling CRT beam deflection to keep the |
| R, G and B beams properly aligned when scanning the raster. |
| Misconvergence shows up as color fringing on picture edges. |
| Convergence adjustment compensates for the physical |
| separation of the R, G and B tubes by aligning their output at |
| a fixed distance from the projector. Convergence adjustments |
| include |
| Uniformity. |
CRT | The vacuum tube used as a display screen in video terminals |
(Cathode Ray Tube) | or television sets. Commonly called the picture tube. |
Export Channel | Exports setup data from projector to computer. Useful when |
| servicing. See Import Channel Data and refer to Appendix 1 |
| for more details. |
Field | One half of a complete video frame. Odd lines in one field |
| and even lines in another make up one frame. |
Frame | One complete TV picture or screen of information. It is |
| composed of two fields and has a total of 525 scanning lines |
| in NTSC transmission. |
Ganged | When R and B are ganged to Green, green is set first, then R |
| and B are set to match G. Thereafter, if R or B are visible on |
| screen, any adjustments to G will affect all three colors. |
Graphics Adapter | A circuit card in a computer that has the function of |
| converting signals used in a computer into signals that a |
| monitor can use to display a video picture. |
Model 330, 340SC, and 370SC Service Manual
