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

Single intercom system
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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 (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.
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Summary of Contents for 3M 478DA (D-15)

  • Page 1: Troubleshooting Guide

    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.
  • Page 2 Technician Troubleshooting Guide Control Name Power Switch Power Indicator Light Volume Control Standby Touch Switch Touch/Talk Switch Indicator Lights Figure 1. Operating Controls Controls application of power to the system. Indicates power is applied to the system. Adjusts the internal speaker (listen) audio level. 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.

  • Page 3: Troubleshooting Table

    Model 478 (D-15) Troubleshooting Table Problem No inbound audio. Power Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is ON.
  • Page 4 With car on loop, VEHICLE Indicator Light (yellow) is OFF, and vehicle detection tone does not sound. Outbound audio distorted. 3M Media InTouch 3M Center, Building 551-1E-02 St. Paul, MN 55144-1000 Possible Cause Defective menu speaker, Check and replace menu menu mic, or wiring.
  • Page 5 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.
  • Page 6 Technician Troubleshooting Guide Control Name Power Switch Power Indicator Light Volume Control Channel Selector Switches (1-6) Indicator Lights Hold Switch All Call Switch Standby Switch Standby Indicator Light Figure 1. Operating Controls Provides power to mainstation. Indicates power is on and the system is ready to operate. Adjusts INCOMING audio level.
  • Page 7 Model 481BA (D-20) Troubleshooting Table Problem No inbound audio. Power Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is ON.
  • Page 8 STANDBY Switch is pressed. Unit will not come out of standby mode. Outbound audio distorted. 3M Media InTouch 3M Center, Building 551-1E-02 St. Paul, MN 55144-1000 Possible Cause Defective call switch. Check and replace call switch. Defective analog or logic Check and replace analog or board.
  • Page 9 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.
  • Page 10 Vehicle Detection automatically places the system into the Channel A listen mode. Red indicates TALK mode. 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.
  • Page 11 Model 479 (D-30) Troubleshooting Table Problem No inbound audio. Power Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is OFF. No inbound audio: Power Indicator Light (green) is ON. LISTEN Indicator Light (green) is ON.
  • Page 12 Indicator Light (yellow) is OFF, and vehicle detection tone does not sound. Outbound audio distorted. Food Services Trade Department 3M Center, Building 551-1E-02 St. Paul, MN 55144-1000 Possible Cause Defective menu speaker, Check and replace menu menu mic, or wiring.

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481ba d-20481baD-15