Quantum Data 801GC, 801GF, 801GX manual Dot10, Dot12, Dot24 contd

Dot_10, Dot_12, Dot_24 — contd.

Purpose	In order to accurately produce an image on a color
	monitor, the three electron beams in the CRT must
	meet (converge) at the exact same location at the
	same time. Small dots displayed on a misconverged
	monitor appear as a group of multicolored dots.
Method	The convergence adjustments of most color
	monitors fall into two main categories.
	The first set of adjustments, usually called Static
	Convergence, aligns the three beams in the center
	of the display. The idea is to turn on all three
	guns and adjust the various magnets on the
	convergence assembly to produce all white dots
	in the center of the display. The convergence
	assembly is located on the neck of the CRT.
	Different monitors and CRT types may each require
	their own magnet-adjustment sequence.
	After the center of the display is properly
	converged, the outer areas are adjusted by using
	the monitor’s Dynamic Convergence controls. The
	number of controls, the area of the screen they
	affect, and their adjustment procedure depends
	on the monitor you’re testing.
Test	Focus adjustment(s)
Purpose	An out-of-focus monitor displays fuzzy pixels
	which, in turn, result in poorly formed and hard-
	to-read characters.
Method	On monitors with a single (static) focus adjustment,
	adjust the control for the best average focus over
	the entire screen. The focus at certain locations
	should be within specified limits.
	Some monitors have a static and one or more
	dynamic focus controls. The sequence for adjusting
	them and the areas of the screen they affect depend
	on the monitor you’re testing.

4-22 Chapter 4: Built-In Images Model 801GC, 801GF & 801GX¥Rev. X1