Audio Troubleshooting Table
| SYMPTOM | CAUSE |
| REQUIRED ACTION |
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| 1. | From Main Menu, choose VOLUME LEVEL. |
• | No audio | Improper volume |
| Check that Attract Music is on (enabled). Verify |
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| setting |
| that all volume levels are set well above zero. |
• | Video is present |
| 2. | If necessary, change levels to make VGM |
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| audible. |
• VGM (video game machine) |
| 1. | From Main Menu, enter Diagnostics Menu. | |
| appears to operate normally | Faulty SIO Board |
| Select SOUND SUBSYSTEM TEST. Test |
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| checks entire sound system. |
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| 2. | Run |
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| that VGM finds during tests. Compare Sound I/O |
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| Board (SIO) LEDs with LED indicator status |
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| charts. Note discrepancies. |
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| 3. | Verify proper operation of SIO Board by placing |
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| it in working VGM. |
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| 4. | If board is faulty, replace it. |
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| 1. | Check that cabinet wiring is correct for this VGM. |
• Constant low hum from all | Faulty wiring | 2. | Verify that cabinet wiring provides separate | |
| speakers. |
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| wires (not common return) for each speaker. |
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| 3. | Check connection of all cabinet ground wires. |
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| 4. | Repair faulty wiring. |
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| Using 2 Volt AC setting on digital voltmeter, |
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| Faulty power supply |
| measure voltages at speaker terminals. Any |
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| reading indicates ripple or noise. In that case, |
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| service power supply. |
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| 1. | Turn off VGM power. Remove grilles and check |
• Audio is distorted, muffled or | Faulty or improper |
| speakers. Assure that speakers are full range | |
| has missing frequencies. | speaker |
| (100 to 10,000 Hz) and rated for at least 20 W. |
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| Woofers must be rated for at least 40 W. |
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| 2. | Verify proper speaker operation by connecting |
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| speaker in question to working VGM. |
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| 3. | If speaker is faulty, replace it. |
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| 1. | |
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| Faulty wiring |
| reversed wires at one speaker. Weak low |
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| frequencies and thin or hollow sound quality is |
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| symptom of incorrectly phased speakers. Sound |
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| tests may not detect this condition, but you can |
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| hear it during VGM operation. |
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| 2. | Repair faulty wiring. |
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| 1. | From Main Menu, choose SOUND TEST. |
• | Dead sound channel | Faulty speaker |
| Recheck speakers with audio signals in test. |
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| 2. | Verify proper speaker operation by connecting |
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| speaker in question to working VGM. |
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| 3. | If speaker is faulty, replace it. |
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| 1. | From Main Menu, enter Diagnostics Menu. |
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| Faulty circuit board |
| Select SOUND SUBSYSTEM TEST. Test |
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| checks entire sound system. |
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| 2. | Run |
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| that VGM finds during tests. Compare circuit |
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| board LEDs with LED indicator status charts. |
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| Note discrepancies. |
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| 3. | Verify SIO Board operation by connecting board |
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| to working VGM. |
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| 4. | If board is faulty, replace it. |
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| 1. | Verify that cabinet wiring is correct. Assure that |
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| Faulty wiring |
| all speakers connect to audio wires. Check for |
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| broken or shorted wires. |
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| 2. | Repair faulty wiring. |
Troubleshooting
