Technician Troubleshooting Guide | Model 478 |
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| Figure 1. Operating Controls | |
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Key | Control Name |
| Function |
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1 | Power Switch |
| Controls application of power to the system. |
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| Power Indicator Light |
| Indicates power is applied to the system. |
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2 | Volume Control |
| Adjusts the internal speaker (listen) audio level. |
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3 | Standby Touch Switch |
| Silences intercom audio to eliminate pickup of undesired |
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| background noise and reconnects optional music/message |
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| source to the external speaker when unit is not in use. The |
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| system automatically exits the standby mode with vehicle |
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| detection or when the Touch/Talk switch is pressed. |
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4 | Touch/Talk Switch |
| Controls talk/listen communications. Operator touches switch |
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| to talk and cancel alert tone. Operator releases switch to |
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| listen. |
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5 | Indicator Lights |
| Red indicates TALK mode. |
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| Green indicates LISTEN mode. |
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| Yellow indicates vehicle presence. |
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| Yellow light above STANDBY lights and all other lights are |
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| extinguished when the system is placed in the standby mode. |
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