Model 481BA (D-20) Technician Troubleshooting Guide
Troubleshooting Table
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| Problem | Possible Cause | Correction |
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No inbound audio. Power | No AC power to the unit. | Check power supply | ||
| Indicator Light (green) is |
| transformer or wall outlet. | |
| OFF. |
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No inbound audio: | Defective logic board or | Check and replace logic | ||
| ∙ | Power Indicator Light | touch pad. | board or touch pad. |
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| (green) is ON. |
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| ∙ | LISTEN Indicator Light |
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| (green) is OFF. |
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No inbound audio: | Defective speaker/mic or | Check and replace speaker or | ||
| ∙ | Power Indicator Light | analog board. | analog board. |
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| (green) is ON. |
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| ∙ | LISTEN Indicator Light |
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| (green) is ON. |
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Inbound audio distorted. | Defective speaker/mic or | Check and replace | ||
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| analog board. | speaker/mic or analog board. |
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No outbound audio: | Defective logic board or | Check and replace logic | ||
| ∙ | Power Indicator Light | touch pad. | board or touch pad. |
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| (green) is ON. |
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| ∙ | TALK Indicator Light |
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| (red) is OFF when TALK |
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| SWITCH is pressed. |
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No outbound audio: | Defective speaker/mic or | Check and replace | ||
| ∙ | Power Indicator Light | analog board. | speaker/mic or analog board. |
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| (green) is ON. |
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| ∙ | TALK Indicator Light |
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| (red) is ON when TALK |
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| SWITCH is pressed. |
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The VEHICLE Indicator | Alert volume too low. | Check and adjust alert | ||
| Light (yellow) blinks, but |
| volume control on analog | |
| vehicle detection tone does |
| board. | |
| not sound. |
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| Defective analog or logic | Check and replace analog or |
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| board. | logic board. |
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(Continued)
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