Midway 4-Player 25" Dedicated Video Game, Operation Manual

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Diagnostic, Audit & Adjustment Menu System for NFL 3-5
Main Menu (continued)
Diagnostics Menu (continued)
Monitor Setup Menu
MONITOR SETUP
Select MONITOR SETUP at the Diagnostics Menu. The Monitor Patterns routine provides test screens to
verify monitor performance or make adjustments.
Highlight an option with any player panel joystick. Select the option with any player panel button.
MONITOR SETUP
COLOR BARS
CROSSHATCH
RED SCREEN
BLUE SCREEN
GREEN SCREEN
WHITE SCREEN
BLACK SCREEN
50 PCT. GRAY SCREEN
25 PCT. GRAY SCREEN
EXIT
MONITOR SETUP MENU
Color Bars fills the screen with colored stripes. Use the color bars to help you to check or adjust monitor
brightness and contrast. The color bars also expose defects in horizontal linearity. Each color bar consists
of 32 intensity levels. On a properly adjusted monitor, the top 31 of these levels are visible. Each bar
should appear sharp, clear and distinct from bars on either side. Incorrect adjustment can cause missing
detail at the top or bottom of a bar. Bent bars indicate horizontal linearity flaws, such as pie crust,
pincushion or barrel distortion. (Correct color bar colors, left to right: Red, Green, Blue, Black, White,
Cyan, Yellow, Violet.) Set controls as follows: 1. Adjust BRIGHTNESS and CONTRAST to minimum. 2.
Turn up BRIGHTNESS until the pixels in the black stripe begin to glow (turn dark gray). 3. Bring up the
CONTRAST control until you can see 31 bars.
Crosshatch Patterns fill the screen with a grid and a series of dots. Crosshatch Patterns help you to
check or adjust several monitor parameters: These include convergence, linearity, active viewing area
and dynamic focus. The grid and the dots should be all white in color, with no fringes or parallel images.
The lines should be straight and the dots round. For more detail on these adjustments, consult service
literature from the monitor manufacturer.
Color Screen tests fill the screen with 100% of the chosen color at normal intensity. The Color Screen
tests help you to check or adjust monitor intensity, black level, blanking and color purity. Each screen
should be absolutely uniform from top to bottom and side to side. No retrace lines or noise should be
visible. Color Screens may not hold their uniformity if the monitor degaussing circuit is defective.
White, Gray and Black Screens fill the screen with black, gray or white at various intensities. These
monochrome screens help you to check or adjust monitor convergence, purity, contrast and intensity.
These screens also simplify black level and color gun control settings. The screens should be uniform
with no color tints or distortion. No retrace lines or noise should be visible.
If tests indicate a need for adjustment, use controls on the Monitor Remote Adjustment Board.