Assessments - 2, GPA: 4
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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 () 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 Indicator Light (green) is OFF. No AC power to the unit. Check power supply transformer or wall outlet. Defective analog board. Check and replace analog board. . No inbound audio: · Power Indicator Light (green) is ON. · LISTEN Indicator Light (green) is OFF. Defective logic board or touch pad. Check and replace logic board or touch pad. . No inbound audio: · Power Indicator Light (green) is ON. · LISTEN Indicator Light (green) is ON. Defective menu speaker, menu mic, or wiring. Check and replace menu speaker, menu mic, or wiring. Defective analog board. Check and replace analog board. . Inbound audio distorted. Defective menu speaker, menu mic, or wiring. Check and replace menu speaker, menu mic, or wiring. Defective analog board. Check and replace analog board. . No outbound audio. Power Indicator Light (green) is OFF. No AC power to the unit. Check power supply transformer or wall outlet. Defective analog board. Check and replace analog board. . No outbound audio: · Power Indicator Light (green) is ON. · TALK Indicator Light (red) is OFF when TALK SWITCH is pressed. Defective logic board or touch pad. Check and replace logic board or touch pad. (continued) 3 Technician Troubleshooting Guide Model 478 (D-15) Problem Possible Cause Correction . No outbound audio: · Power Indicator Light (green) is ON. · TALK Indicator Light (red) is ON when TALK SWITCH is pressed. Defective menu speaker, menu mic, or wiring. Check and replace menu speaker, menu mic, or wiring. Defective analog board. Check and replace analog board. . With car on loop, VEHICLE Indicator Light (yellow) is ON, but vehicle detection tone does not sound. Alert volume control setting too low. Check and/or increase the Alert volume control setting on bottom of unit. Defective analog board. Check and replace analog board. . With car on loop, VEHICLE Indicator Light (yellow) is OFF, and vehicle detection tone does not sound. Defective logic or analog board. Check and replace logic or analog board. . Outbound audio distorted. Defective analog board. Check and replace analog board. Defective internal microphone. Replace microphone. Defective menu sign speaker. Replace menu sign speaker. Printed in U.S.A. © 3M 1997 January 3M Media InTouch Printed on 50% recycled paper, 3M Center, Building 551-1E-02 78-6912-0660-7 Rev. A including 10% post-consumer waste. St. Paul, MN 55144-1000 Troubleshooting Guide Model 481 BA (D-20) 6-Channel Intercom System Introduction The Model 481 is a 6-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. 3 Intracom D-20 VOLUME OFF ON SP-206A 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 () 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...