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- When the monitor is turned on power
- flows into the power supply. This
- converts the house current into
- several voltages. Some of this
- power goes to the electron gun at
- the back of the picture tube. The
- gun is always ready to fire a
- stream of electrons at the front of
- the picture tube. The inside of the
- glass at the front is coated with a
- chemical that will glow if it is
- hit by electrons. This coating is
- similar to the coating inside a
- fluorescent light.
- To make the electrons hit the
- screen hard and light it up, the
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- screen is given a strong positive
- voltage by a transformer called the
- flyback.
- There is a wire between the
- circuit board and the electron gun
- that can turn it on and off quickly.
- Around the back of the picture
- tube are some coils of wire called
- the yoke. When electricity flows
- through the yoke, a magnetic field
- is created which controls the
- electron beam.
- Without the yoke, the
- electron beam would always hit the
- center of the screen. All you would
- ever see is a small white dot.
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- O10
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