Technician Troubleshooting Guide | Model 479 |
6
5
3 
5 |
2 |
4 |
1
| Figure 1. Operating Controls | |
|
|
|
Key | Control Name | Function |
|
|
|
|
|
|
1 | Power Switch | Controls application of power to the system. |
|
|
|
| Power Indicator Light | Indicates power is applied to the system. |
|
|
|
2 | Volume Control | Adjusts the mainstation internal speaker (listen) audio level. |
| ||
|
|
|
3 | Talk Switches (A & B) | Control talk/listen communication for the respective channel |
|
| (A or B). Operator touches switch to talk and releases switch |
|
| to listen. |
|
|
|
4 | Standby Switch | Silences audio to eliminate pickup of undesired background |
|
| noise when unit is not in use. Touching either the Channel A |
|
| or Channel B Talk Switch releases STANDBY mode. |
|
| Vehicle Detection automatically places the system into the |
|
| Channel A listen mode. |
|
|
|
5 | Indicator Lights (same for Channel A and | Red indicates TALK mode. |
| Channel B) | Green indicates LISTEN mode. |
|
| Yellow indicates vehicle presence (when used with 3M |
|
| SODAR or magnetic loop detection system). |
|
| All indicator lights are extinguished when mainstation is in |
|
| the standby mode. |
|
|
|
6 | Standby Mode Switch | AUTO (automatic) position causes system to switch from |
|
| Channel A Listen to Standby when there is no vehicle detect |
|
| signal. MAN (manual) position allows operator to use |
|
| Channel A without vehicle detection. |
|
|
|
|
|
|
2
