Video Troubleshooting Table, continued
| SYMPTOM | CAUSE |
| REQUIRED ACTION |
|
|
|
| |
• 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 ovoid or cylindrical |
|
|
|
|
|
| 1. | Check connectors and cables for wiring |
• Video tears or rolls, or has | Faulty wiring |
| continuity. Video cables connect computer to | |
| black bar down middle of |
|
| circuit boards, and then to video monitor. |
| screen |
| 2. | Assure connection of all cabinet ground wires, |
|
|
|
| especially at video monitor chassis. |
|
|
| 1. Verify that video monitor operates correctly by | |
|
| Faulty monitor |
| connecting it to working VGM. |
|
| circuitry | 2. | Assure that video monitor is correct type for this |
|
|
|
| VGM. Video monitors with wrong resolution can’t |
|
|
|
| lock sync. |
|
|
| 1. Check to see if Video Board puts out type of | |
|
| Improper sync signals |
| sync that your monitor requires. |
|
|
| 2. Verify that jumpers are set correctly for monitor. | |
|
|
| 3. If necessary, change video sync jumper on | |
|
|
|
| Diego Board. Refer to Wiring chapter for details. |
|
| Electromagnetic |
| Move cabinet far away from machines, |
|
| fields |
| appliances, or VGMs (video game machines). |
• | Missing colors |
|
| Check connectors and cables for wiring |
|
| Faulty wiring |
| continuity from circuit boards to video monitor. |
|
| Faulty monitor color |
| Verify that video monitor operates correctly by |
|
| drive circuitry |
| connecting it to working VGM. |
|
|
| 1. | Turn on VGM. |
• One color is dimmer or | Maladjusted color | 2. | Enter Monitor Patterns 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. |
|
|
| 6. If whites still seem tinted, have service bureau | |
|
|
|
| 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 |
|
|
|
| rejuvenate picture tube. |
|
|
|
| Enter Monitor Patterns Menu. Watch Crosshatch |
• Picture is too narrow | Maladjusted WIDTH |
| Screen while adjusting WIDTH pot for best | |
|
| pot |
| picture. You’ll find this pot on Monitor Remote |
|
|
|
| Control Board, behind coin door. |
|
|
| 1. Enter Monitor Patterns Menu. Watch Crosshatch | |
• Picture is too short | Maladjusted HEIGHT |
| Screen while adjusting HEIGHT pot for best | |
|
| pot or damaged |
| picture. You’ll find this pot on Monitor Remote |
|
| vertical circuit |
| Control Board, behind coin door. |
|
|
| 2. If pot has no effect, service vertical output circuit. | |
|
|
|
| Enter Monitor Patterns Menu. Watch Crosshatch |
• Picture seems shifted to one | Maladjusted |
| Screen while adjusting HORIZONTAL POSITION | |
| side | HORIZONTAL |
| pot for best picture. You’ll find this pot on Monitor |
|
| POSITION pot |
| Remote Control Board, behind coin door. |
|
|
| 1. | Substitute working yoke. |
• | Shorted turns in yoke | 2. | Have service bureau converge monitor. | |
|
|
| 3. | Retest monitor. |
Troubleshooting
