Technician Troubleshooting Guide | Model 479 |
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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 mainstation internal speaker (listen) audio level. |
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3 | Talk Switches (A & B) | Control talk/listen communication for the respective channel |
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| (A or B). Operator touches switch to talk and releases switch |
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| to listen. |
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4 | Standby Switch | Silences audio to eliminate pickup of undesired background |
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| noise when unit is not in use. Touching either the Channel A |
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| or Channel B Talk Switch releases STANDBY mode. |
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| Vehicle Detection automatically places the system into the |
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| Channel A listen mode. |
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5 | Indicator Lights (same for Channel A and | Red indicates TALK mode. |
| Channel B) | Green indicates LISTEN mode. |
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| Yellow indicates vehicle presence (when used with 3M |
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| SODAR or magnetic loop detection system). |
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| All indicator lights are extinguished when mainstation is in |
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| the standby mode. |
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6 | Standby Mode Switch | AUTO (automatic) position causes system to switch from |
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| Channel A Listen to Standby when there is no vehicle detect |
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| signal. MAN (manual) position allows operator to use |
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| Channel A without vehicle detection. |
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