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MONITOR PA-l-TERNS
The Monitor Patterns routine provides test screens to verify monitor performance or make adjustments.
Highlight the test by using any joystick to select the option; then press any control panel button to activate.
RED SCREEN
GREEN SCREEN
BLUE SCREEN
COLOR BARS
CROSSHATCH
BACK TO DIAGNOSTICS MENU
RETURN TO MAIN MENU
MONITOR PATTERN SUB MENU
Color Screen
tests fill the screen with 100% of the chosen color at normal intensity. Each screen should
be absolutely uniform from top to bottom and side to side. No retrace lines or noise should be visible.
The Color Screen tests are useful in verifying monitor intensity, black level, blanking and degaussing.
Color Bars fills the screen with shades of colors to verify red, green, blue and white level dynamic
adjustments. Each color bar should appear sharp, clear, and distinct from bars on either side.
There are 15 levels of intensity displayed in each color bar. Incorrect adjustment can cause detail to be
missing at the top or bottom of a bar. Set the controls so that all 15 levels are visible in every color bar.
The Color Bars screen is useful in adjusting the monitor brightness and contrast.
Crosshatch Patterns
fill the screen with a grid and a series of dots. The grid and the dots should be all
one color, with no fringes or parallel images. The lines should be straight and the dots round.
Two color bars should be visible at the center of each screen edge. These bars verify scan size.
The Crosshatch Patterns are useful in verifying the monitor convergence, linearity, and dynamic focus.
If any of the tests shows a need for adjustment, use the proper knobs on the Monitor Controls board.
.
BURN-IN TEST
The Burn-in Test continually repeats the CPU Board Test. This continually checks critical components.
Use any joystick to select the option; then press any control panel button to activate. When the Bum-in
Test detects an error, the test stops and displays an error message on the screen. Use this test to find
intermittent CPU or power supply problems.
To exit this test, switch the game OFF then ON again. The controls and switches will not affect this test.
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