PROBLEM
Picture | Black vertical |
| |
| lines are visible |
Abnormal | on the screen. |
| |
|
|
Two fine horizontal lines are visible on the screen.
ITEMS TO CHECK |
| LOCATION | |
• Thin vertical black lines on one or both sides of the screen. | • | – | |
This minor condition is caused by grille element overlap | |||
|
| ||
which can occur during shipping. |
|
| |
Position an open white window over the affected area of |
|
| |
the screen and maximize the brightness and contrast |
|
| |
controls. This will cause localized heating of the overlap |
|
| |
which will clear in a few minutes. Be sure to readjust the |
|
| |
brightness and contrast controls back to the normal viewing |
|
| |
levels after this procedure. |
|
| |
|
|
|
�� ��
• The 2 very faint thin lines across the screen are normal. | • | – |
They are caused by the aperture grille stabilization |
|
|
filaments(Damper Wires) which are required for all |
|
|
aperture grille CRTs’. |
|
|
| Aperture Grille |
|
| Electron Gun | Shadow of |
| Damper Wires | |
|
| |
| Damper Wires |
|
Shadow of Damper Wires | Aperture Grille Type |
|
|
|
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 automatic degaussing |
|
|
function. This sound will be heard each time the monitor is |
|
|
powered up from a cold start and each time the manual |
|
|
degauss button is used. |
|
|
|
|
|
- 20 -