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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.

3M Media InTouch

3M Center, Building 551-1E-02
St. Paul, MN 55144-1000

Printed on 50% recycled paper,
including 10% post-consumer waste.

Содержание 478DA (D-15)

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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