Technician Troubleshooting Guide

Model 479 (D-30)

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SP-208A

 

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.

 

 

 

 

 

 

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3M 478DA (D-15) manual Model 479 D-30, Operating Controls