Monitor Test Patterns

Use this item to see thirteen screens for checking the video display, the color RAMs and the GSP, which controls the video RAMs (VRAMs) and the video output.

Some screen can be used to adjust the video display.

To move through the screens, press the coin switches.

• Color Bars screen shows from left to right, the colors white, yellow, light blue, green, purple, red, blue, and grey. If the colors are incorrect, see your video display manual included with the simulator for adjustment procedures.

• Monitor Brightness checks the adjustment of the video display brightness.

• Grey Scale screen shows a white line on the left, then black shading to white across the screen.

• B/WDots screen can be used to check convergence and focus.

• B/W Grid screen, shows a black background and a white grid pattern to check convergence. The grid lines should be straight within 3.0 mm. If you need to adjust the convergence, see the video display manual included with the simulator.

• Diagonal Lines screen can be used to check video display linearity.

• Full Screen Color Screens test the color purity in the color RAMs and the display. The test displays a grey, white, red, green, and then blue screen. Each screen should be a rectangle of color, with no curving at the corners and no lines in the raster. If it does not, see your video display manual included with the simulator for adjustment procedures.

• Monitor High Voltage Test screens switch between a white screen and a grey screen. If the high voltage to the display is regulated properly, the sides of the screen will fluctuate about 3/4-inch between the white and grey screens.

• Scrolling Test screen checks the scrolling mechanism in the GSP.

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Choose this item if you want to set the clock, turn the clock on, or turn it off. The clock should be set correctly so statistics on the operator screen Games Played by Day and Time will give the proper information and the high score table will be cleared on Wednesday.

You may need to turn on the clock if the simulator has a program crash. Turn off the clock only if you plan to store the simulator more than six months. The clock has a lithium battery that should last more than five years if the simulator is in normal use.

To turn off the clock, choose Clock Off from the clock submenu, shown in Figure 2-13. To turn on the clock, choose Start Clock from the menu. In about two seconds, the clock will start.

If the clock is losing or gaining time, then use Clock Faster or Clock Slower to adjust the calibration of the clock.

Choose the item you need from the menu by using the right and left coin switches. Change the item setting by turning the key until you see the correct time.

The items on the clock menu are explained below.

• Exit returns you to the test menu.

• Inc Hours changes the hour setting ahead.

• Inc Minutes changes the minute setting ahead.

• Inc Seconds changes the second setting ahead.

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