3M 478DA (D-15) User Manual Download

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Technician Troubleshooting Guide

Model 481BA (D-20)

Intracom D-20

VOLUME

OFF ON

SP-205A

Figure 1. Operating Controls

Key

Control Name

Function

Power Switch

Provides power to mainstation.

Power Indicator Light

Indicates power is on and the system is ready to operate.

Volume Control

Adjusts INCOMING audio level.

NOTE: Volume level adjustments for alert tone and outside
speakers are set by the installer.

Channel Selector Switches (1-6)

These switches control talk/listen communication for
numbered channels. Operator touches switch to talk and
releases switch to listen.

Indicator Lights

Red indicates TALK mode.
Green indicates LISTEN mode.
Yellow (steady) indicates channel on "HOLD."
Yellow (flashing) indicates incoming call WAITING.

Hold Switch

Places selected channel in "HOLD" mode.

All Call Switch

Controls conversation with all channels simultaneously.

Standby Switch

Silences incoming audio to eliminate undesired background
noise pickup when unit is not in use. Touching any
CHANNEL SELECTOR SWITCH releases STANDBY
mode.

Standby Indicator Light

Indicates unit is in STANDBY mode.

Summary of Contents for 478DA (D-15)

Page 1: ...te 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 list...

Page 2: ...nd 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 mod...

Page 3: ...or 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 powe...

Page 4: ...o 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 ...

Page 5: ...e 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 liste...

Page 6: ...s 1 6 These switches control talk listen communication for numbered channels Operator touches switch to talk and releases switch to listen 5 Indicator Lights Red indicates TALK mode Green indicates LISTEN mode Yellow steady indicates channel on HOLD Yellow flashing indicates incoming call WAITING 6 Hold Switch Places selected channel in HOLD mode 7 All Call Switch Controls conversation with all ch...

Page 7: ...r analog board Inbound audio distorted Defective speaker mic or analog board Check and replace speaker mic or 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 No outbound audio Power Indicator Light green is ON TALK Indicator Light red is ON when...

Page 8: ...ode when STANDBY Switch is pressed Defective logic board Check and replace logic board Unit will not come out of standby mode Defective logic board Check and replace logic board Outbound audio distorted Defective analog board Check and replace analog board Defective internal microphone Replace microphone Defective outside speaker Replace speaker 3M Media InTouch 3M Center Building 551 1E 02 St Pau...

Page 9: ...t 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 wh...

Page 10: ...ate pickup of undesired background noise when unit is not in use Touching either the Channel A or Channel B Talk Switch releases STANDBY mode Vehicle Detection automatically places the system into the Channel A listen mode 5 Indicator Lights same for Channel A and Channel B Red indicates TALK mode Green indicates LISTEN mode Yellow indicates vehicle presence when used with 3M SODAR or magnetic loo...

Page 11: ...or 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 powe...

Page 12: ...ain signal too low Adjust R6 to increase signal level 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 microp...

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