Self Test Procedure

To enter Self-Test, set the self-test switch to the on position. Press FIRE and then 1-player start. If the test passes, the screen goes blank for a few seconds and then displays the picture below. See Chapter 1, Section F, Self-Test Procedure for a complete description of this picture.

Figure 2-1 Self-Test Screen 1 Test Passes

This procedure does not test the coin door lockout coils and coin counter. If the lockout coils do not energize when the game is on, suspect the lockout coil wiring, coin door harness, game PCB harness, latch R9, or driver Q2 of the game PCB. Troubleshoot using the game schematics.

SCREEN 1:

RAM failure is indicated by a sound and, if possible, an R displayed in the top center of the screen. Count the tones. One or two tones indicates RAM failure at game PCB location N/P1. Three or four tones indicate RAM failure at game PCB location K7.

Failing

RAM Location

Tone on Game PCB

1st or 2nd N/P1

3rd or 4th K7

ECJP

Figure 2-2 Self-Test Screen 1 Test Fails

ROM failure is indicated by one or more vertically arranged numbers displayed on the top half of the screen (see Figure 2-2). The bad ROM and its location are listed as follows:

Screen Display

Failing

ROM Location on Game PCB

M/N7

N/P7

E/F1

K/L1 M1

*lf this ROM is bad you will hear a constant low tone, and the program may be unable to display a screen image. "If this ROM is bad, the screen may be blank.

SWITCH failure is indicated by the associated 0 not changing to a 7 on the screen and no sound when the switch is activated. Troubleshoot using the information in Chapter 3, Section B, and game schematics.

SOUND failure is indicated by no sound. Check the volume control levels on the utility panel, or troubleshoot using the game schematics.

To see the remaining self-test screens (2 through 8), press the coin switch on the utility panel for each screen.

Figure 2-3 Self-Test Screen 2

SCREEN 2:

A white diagonal grid pattern and a complete character set appear on the screen (see Figure 2-3). The edges of the grid pattern should touch the sides of the screen. If the display is not centered, symmetrical, or the proper size, adjust the X SIZE, Y SIZE, X CTR, Y CTR, X LIN, OR Y LIN pots on the game PCB (refer to the Schematic Package). If the characters are incorrect, check again for a 2 displayed in the preceding ROM failure test.

EAROM or CUSTOM I/O CHIP failure is indicated by one letter in the top center of the sceen. Identify the failure with the table below.

Letter Displayed

Location on Game PCB

EAROM at M2

Custom I/O chip at C/D3

Custom I/O chip at B3

WHITE (RGB)

YELLOW (RG) LIGHT BLUE (GB) LAVENDER (RB)

Figure 2-4 Self-Test Screen 3

SCREEN 3:

A white box of decreasing size appears during this test. The box should shrink smoothly. There are seven stages, each with a tone. This pattern tests the binary and linear scaling circuitry. Troubleshoot using the game schematics.

Figure 2-6 Self-Test Screen 5 SCREEN 5:

This test checks the seven screen colors and six intensities of each color (see Figure 2-6). If the intensities do not progress from dim at the top of each color group to bright at the bottom, there is a problem in the Z-axis of the game PCB or the video display. Use this pattern for tracking adjustments (refer to the color X-Y display manual).

Figure 2-5 Self-Test Screen 4 Figure 2-7 Self-Test Screen 6

SCREEN 4:

A series of horizontal lines are visible in the middle of the screen. This is a raster test, used by the manufacturer only, to set the color levels.

SCREEN 6:

A grid pattern touches the corners of the video display (see Figure 2-7). Press the 1-player start button to change colors. Use this pattern for purity and convergence adjustments (refer to the color X-Y display manual).

VECTOR-GENERATOR DIAGNOSTIC PROGRAM

The diagnostic program is controlled by switches 2, 3, and 4 in the 4-toggle option switch bank at location P10/11 on the game PCB. This group of switches lets you choose one of six tests.

Test Action

Test 1 Test 2

Test 3

Test 4

Test 5

Test 6

Test 2 Test 2

TEST 3

TEST 5

Figure 2-8 Screen 7 : Self-Test

TEST 5

Figure 2-8 Screen 7 : Self-Test

Press the coin switch while pressing the 2-player start button. The screen will either be blank or display vectors, depending on settings of the switch toggles at location P10/11 on the game PCB (see Figure 2-8).

These tests provide recurring sequences to make it easy for you to troubleshoot the vector-generator circuitry. The tests and their respective option switch settings are as follows:

Settings of 4-Position DIP Switch at P10/11

4

3

2

Off

Off

Off

On

Off

Off

Off

On

Off

On

On

Off

Off

Off

On

On

Off

On

Off

On

On

On

On

On

Screens During Signature Analysis

To exit from this screen, set the self-test switch to off or press RESET on the game PCB.

Press WDDIS every 4 msec (blank screen)

Test vector-generator halt instruction every .55 msec (blank screen)

Test vector-generator long vector (and halt instruction) every 8.2 msec

Test vector-generator jump instruction (and long vector and halt instruction) every 8.2 msec

Test vector-generator short vector instruction (and all of Test 4) every 8.6 msec

Test vector-generator JSRL/RTSL instruction (and all of Test 5) every 10.2 msec

Blank screen

Blank screen

This chapter details maintenance and repair information and provides information you need to order parts for your Gravitarâ„¢ game. Please note that common hardware has been deleted from most of the parts lists. Common hardware includes screws, nuts, washers, bolts, and the like.

The parts lists are arranged in alphanumeric order. For example, all A- prefix numbers come first. Following these are numbers in sequence evaluated up to the hyphen, namely 00- thru 99-, then 000598- thru approximately 190000-.

When ordering parts, please give the part number, part name, applicable figure number of this manual, and serial number of your game. This will help to avoid confusion and mistakes in your order. We hope the results will be less downtime and more profit from your game.

Atari Customer Service numbers are listed in the front of this manual for your convenience.

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