Video Troubleshooting Table, continued
| SYMPTOM | CAUSE |
| REQUIRED ACTION |
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| |
• White areas at screen edges |
|
| Have service bureau dynamically reconverge | |
| appear tinged with color | Picture tube dynamic |
| monitor. This procedure requires removing and |
|
| convergence is out of |
| repositioning yoke. Service bureau must follow |
• Dots at screen edges | alignment |
| instructions from monitor manufacturer. | |
| appear oval or cylindrical |
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| 1. | Check to see if Video Board puts out type of |
• Video tears or rolls, or has | Improper sync signals |
| sync that your monitor requires. | |
| black bar down middle of |
| 2. | Adjust sync for monitor you’re using: On SIO |
| screen |
|
| Board, set DIP switch bank U12, switch 2. Off = |
|
|
|
| medium resolution (default); on = low resolution. |
• Video may appear as |
| 3. | Verify that jumpers are set correctly for monitor. | |
| colored bars of dashed lines |
| 4. | If necessary, add or remove video sync jumper |
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| at Sound I/O Board jumper block J2. With no |
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| pins connected (or pins 2 and 3 connected), |
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| board outputs positive sync. With pins 1 and 2 |
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| connected, board outputs negative sync. |
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|
| 1. | Check connectors and cables for wiring |
|
| Faulty wiring |
| continuity. Video cables connect graphics card |
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| to circuit boards, and then to video monitor. |
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|
| 2. | Assure connection of all cabinet ground wires, |
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| especially at video monitor chassis. |
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| 3. | If you find faulty wiring, repair it. |
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| 1. | Check video monitor operation by connecting it |
|
| Faulty monitor |
| to working VGM (video game machine). |
|
| circuitry | 2. | Assure that monitor is correct type for this VGM. |
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| Monitors with wrong resolution can’t lock sync. |
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| 3. | If you have wrong type monitor, replace it. |
|
| Electromagnetic |
| Move cabinet far away from machines, |
|
| fields |
| appliances, or competitors’ VGMs. |
• | Missing colors |
| 1. | Check connectors and cables for wiring |
|
| Faulty wiring |
| continuity from circuit boards to video monitor. |
|
|
| 2. | Repair faulty wiring. |
|
| Faulty monitor color |
| Verify that video monitor operates correctly by |
|
| drive circuitry |
| connecting it to working VGM. |
• One color is dimmer or | Maladjusted color | 1. | Turn on VGM (video game machine). | |
2. | Enter Monitor Tests Menu. | |||
| brighter than others | bias pots | 3. | Watch Color Bars screen in mirror. |
|
|
| 4. | Adjust three bias pots for best colors. (Most |
• | Whites appear tinted |
|
| monitor neck boards include these pots.) |
| everywhere on screen |
| 5. | Also check White Screen. Touch up controls. |
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|
| 6. | If whites still seem tinted, have service bureau |
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| rejuvenate picture tube. |
|
|
| 1. | Watch Color Bars screen. Adjust BRIGHTNESS |
• Picture is dim or faded | Maladjusted |
| and CONTRAST pots for greatest number of | |
|
| BRIGHTNESS pot or |
| grays. You’ll find these pots on Monitor Remote |
|
| subnormal picture |
| Control Board, behind coin door. |
|
| tube emission | 2. | If pots have no effect, have service bureau |
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|
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| rejuvenate picture tube. |
Troubleshooting
