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| PROBLEM |
| ITEMS TO CHECK |
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| Black vertical | • | Thin vertical black lines on one or both sides of | • |
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| the screen. This minor condition is caused by |
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| lines are |
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| grille element overlap which can occur during |
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| visible on the |
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| shipping. We suggest slapping the cabinet sides |
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| screen. |
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| with an open hand after the monitor is warm. |
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| If this fails, position an open white window over |
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| the affected area of the screen and maximize |
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Picture |
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| the brightness and contrast controls. This will |
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| clear permanently in a few minutes. Be sure to |
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| cause localized heating of the overlap which will |
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Abnormal |
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| readjust the brightness and contrast controls |
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| back to the normal viewing levels after this |
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| procedure. |
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| �� |
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| �� |
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Two fine horizontal | The 2 very faint thin lines across the screen are • | – | |
lines are visible on | normal. They are caused by the aperture grille |
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the screen. | stabilization filaments which are required for all |
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| aperture grille CRTs’. |
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| Aperture Grille |
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| Electron Gun | Shadow of |
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| Damper Wires |
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| Damper Wires |
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Shadow of Damper Wires | Aperture Grille Type |
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A buzzing sound when power on.
A brief vibration or hum sound that is heard just | • | – |
after power up is normal. This is caused by the |
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automatic degaussing function. This sound will |
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be heard each time the monitor is powered up |
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from a cold start and each time the manual |
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degauss button is used. |
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