Model 479 D-30 2-Channel Intercom System

Troubleshooting Guide

Model 479 (D-30) 2-Channel Intercom System

Introduction

The Model 479 is a 2-channel intercom system that is typically used to provide communication between store counters and pump islands in self-service gas stations, convenience stores and truck stops.

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.