3M 478DA (D-15) User Manual
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Troubleshooting Guide

Model 478DA (D-15)

Single Intercom System

Introduction

The Model 478DA is a single-channelintercom system that is used forpoint-to-pointcommunication applications. The system includes a visible/audible presence alert and the capability of multiple units communicating with the same loudspeaker.

Problem Isolation Procedure

Use the troubleshooting table on the following pages to help isolate the problem:

1.Start at the top of the table and work down to the bottom.

2.For each symptom listed, determine if it applies to the situation.

3.If a symptom does apply, check (ü) the box adjacent to the symptom.

4.Read across the table to the possible causes and corrections listed in the middle and right columns.

5.Investigate these possible causes and implement the corrections. Possible causes are listed in the order in which they are most likely to occur.

If none of the possible causes and corrections applies to the situation, call 3M Media InTouch and review the "checked" symptoms with the technical support staff.

1

Technician Troubleshooting Guide

Model 478 (D-15)

 

 

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 internal speaker (listen) audio level.

 

 

 

 

 

 

3

Standby Touch Switch

 

Silences intercom audio to eliminate pickup of undesired

 

 

 

background noise and reconnects optional music/message

 

 

 

source to the external speaker when unit is not in use. The

 

 

 

system automatically exits the standby mode with vehicle

 

 

 

detection or when the Touch/Talk switch is pressed.

 

 

 

 

4

Touch/Talk Switch

 

Controls talk/listen communications. Operator touches switch

 

 

 

to talk and cancel alert tone. Operator releases switch to

 

 

 

listen.

 

 

 

 

5

Indicator Lights

 

Red indicates TALK mode.

 

 

 

Green indicates LISTEN mode.

 

 

 

Yellow indicates vehicle presence.

 

 

 

Yellow light above STANDBY lights and all other lights are

 

 

 

extinguished when the system is placed in the standby mode.

 

 

 

 

 

 

 

 

2

Model 478 (D-15)Technician Troubleshooting Guide

Troubleshooting Table

 

 

Problem

Possible Cause

Correction

 

 

 

 

 

 

 

 

 

No inbound audio. Power

No AC power to the unit.

Check power supply

 

Indicator Light (green) is

 

transformer or wall outlet.

 

OFF.

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

board.

 

 

 

 

 

No inbound audio:

Defective logic board or

Check and replace logic

 

Power Indicator Light

touch pad.

board or touch pad.

 

 

(green) is ON.

 

 

 

LISTEN Indicator Light

 

 

 

 

(green) is OFF.

 

 

 

No inbound audio:

Defective menu speaker,

Check and replace menu

 

Power Indicator Light

menu mic, or wiring.

speaker, menu mic, or wiring.

 

 

 

 

 

(green) is ON.

 

 

 

LISTEN Indicator Light

 

 

 

 

(green) is ON.

 

 

 

 

 

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

board.

 

 

 

 

 

Inbound audio distorted.

Defective menu speaker,

Check and replace menu

 

 

 

menu mic, or wiring.

speaker, menu mic, or wiring.

 

 

 

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

board.

 

 

 

 

 

No outbound audio. Power

No AC power to the unit.

Check power supply

 

Indicator Light (green) is

 

transformer or wall outlet.

 

OFF.

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

board.

 

 

 

 

 

No outbound audio:

Defective logic board or

Check and replace logic

 

Power Indicator Light

touch pad.

board or touch pad.

 

 

(green) is ON.

 

 

 

TALK Indicator Light

 

 

 

 

(red) is OFF when TALK

 

 

 

 

SWITCH is pressed.

 

 

 

 

 

 

 

(continued)

3

Technician Troubleshooting Guide

 

Model 478 (D-15)

 

 

 

 

 

 

 

 

 

 

Problem

Possible Cause

Correction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No outbound audio:

Defective menu speaker,

Check and replace menu

 

 

 

Power Indicator Light

menu mic, or wiring.

speaker, menu mic, or wiring.

 

 

 

 

(green) is ON.

 

 

 

 

 

TALK Indicator Light

 

 

 

 

 

 

(red) is ON when TALK

 

 

 

 

 

 

SWITCH is pressed.

 

 

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

With car on loop, VEHICLE

Alert volume control setting

Check and/or increase the

 

 

 

Indicator Light (yellow) is

too low.

Alert volume control setting

 

 

 

ON, but vehicle detection tone

 

on bottom of unit.

 

 

 

does not sound.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective analog board.

Check and replace analog

 

 

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

With car on loop, VEHICLE

Defective logic or analog

Check and replace logic or

 

 

 

Indicator Light (yellow) is

board.

analog board.

 

 

 

OFF, and vehicle detection

 

 

 

 

 

tone does not sound.

 

 

 

 

 

 

 

 

 

 

 

Outbound audio distorted.

Defective analog board.

Check and replace analog

 

 

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

 

 

 

Defective internal

Replace microphone.

 

 

 

 

 

microphone.

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective menu sign

Replace menu sign speaker.

 

 

 

 

 

speaker.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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