3M - 478DA (D-15)

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Contents

Troubleshooting Guide Model 478DA D 15 Single Intercom System Introduction The Model 478DA is a single channel intercom system that is used for point to point communication 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 S 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 c ...