All the circuitry discussed so far is part of the computer or its video adapter unit. The circuitry inside the monitor is responsible for accepting, amplifying, and routing the video and synchronizing information to the CRT's electron guns and the deflection coils.
Monitor Handling
Show in figure, Components located inside a typical CRT (Cathode Ray Tube) color monitor. Of particular interest is the high voltage anode that connects the tube to the high voltage sections of the signal processing board. This is a very dangerous connection that is not to be touched.
Operation of a monitor with the cover removed poses a shock hazard from the power supply. Therefore, any one unfamiliar with the safety precautions associated with high voltage equipment should not attempt servicing.
The high voltage levels do not necessarily disappear because the power to the monitor is turned off. like television sets, monitors have circuitry capable of storing high voltage potentials long after power has been removed. Always discharge the anode of the picture tube to the receiver chassis before handling the CRT tube. Due to the high voltage levels, you should never wear antistatic grounding straps when working inside the monitor.
An additional hazard associated with handling CRTs is that the tube is fragile. Take extra care to prevent the neck of the tube from striking any surface. Never lift the tube by the neck especially when removing or replacing a CRT tube in the chassis. If the picture tubes envelope is cracked or ruptured, the inrush of air will cause a high velocity implosion, and the glass will fly in all directions. Therefore, you should always wear protective googles when handling picture tubes.
Color monitors produce a relatively high level of X radiation. The CRT tube is designed to limit X radiation at its specified operating voltage. If a replacement CRT tube is being installed, make certain to replace it with one of the same type, and with suffix numbers that are the same. You can obtain this information from the chassis schematic diagram inside the monitors housing.
Monitor Handling
Show in figure, Components located inside a typical CRT (Cathode Ray Tube) color monitor. Of particular interest is the high voltage anode that connects the tube to the high voltage sections of the signal processing board. This is a very dangerous connection that is not to be touched.
Operation of a monitor with the cover removed poses a shock hazard from the power supply. Therefore, any one unfamiliar with the safety precautions associated with high voltage equipment should not attempt servicing.
The high voltage levels do not necessarily disappear because the power to the monitor is turned off. like television sets, monitors have circuitry capable of storing high voltage potentials long after power has been removed. Always discharge the anode of the picture tube to the receiver chassis before handling the CRT tube. Due to the high voltage levels, you should never wear antistatic grounding straps when working inside the monitor.
An additional hazard associated with handling CRTs is that the tube is fragile. Take extra care to prevent the neck of the tube from striking any surface. Never lift the tube by the neck especially when removing or replacing a CRT tube in the chassis. If the picture tubes envelope is cracked or ruptured, the inrush of air will cause a high velocity implosion, and the glass will fly in all directions. Therefore, you should always wear protective googles when handling picture tubes.
Color monitors produce a relatively high level of X radiation. The CRT tube is designed to limit X radiation at its specified operating voltage. If a replacement CRT tube is being installed, make certain to replace it with one of the same type, and with suffix numbers that are the same. You can obtain this information from the chassis schematic diagram inside the monitors housing.
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