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Troubleshooting Guide
Model 481 BA (D-20) 6-Channel Intercom System
Introduction
The Model 481 is a 6-channel intercom systemthat is typically used to provide communication between store
counters and pump islands in self-servicegas stations, convenience stores and truck stops.
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Intracom D-20
VOLUME
OFF ON
SP-206A
Problem Isolation Procedure
Use the troubleshooting table on the following pagesto help isolate the problem:
1. Start at the top of the table and work down to the bottom.
2. For each symptomlisted, determine if it applies to the situation.
3. If a symptomdoes 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 rightcolumns.
5. Investigatethese 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 InTouchand review the
"checked" symptomswith the technical support staff.