Compaq 210189-001 Compaq P710/P910/P1210 Color Monitor User's Guide - Page 22

Abnormal Picture PROBLEM ITEMS TO CHECK • 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. Black vertical lines are visible on the screen. 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. A B LOCATION - Two fine horizontal • The 2 very faint thin lines across the screen are normal. • - lines are visible on They are caused by the aperture grille stabilization the screen. filaments(Damper Wires) which are required for all aperture grille CRTs'. Aperture Grille Electron Gun Damper Wires Shadow of Damper Wires Shadow of Damper Wires Aperture Grille Type A buzzing sound • A brief vibration or hum sound that is heard just after power • - when power on. 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.