3M 478DA (D-15) manual 3M Media InTouch

Technician Troubleshooting Guide					Model 478 (D-15)
			Problem	Possible Cause	Correction
	￿	No outbound audio:		Defective menu speaker,	Check and replace menu
		∙	Power Indicator Light	menu mic, or wiring.	speaker, menu mic, or wiring.
			(green) is ON.
		∙	TALK Indicator Light
			(red) is ON when TALK
			SWITCH is pressed.
				Defective analog board.	Check and replace analog
					board.
	￿	With car on loop, VEHICLE		Alert volume control setting	Check and/or increase the
		Indicator Light (yellow) is		too low.	Alert volume control setting
		ON, but vehicle detection tone			on bottom of unit.
		does not sound.
				Defective analog board.	Check and replace analog
					board.
	￿	With car on loop, VEHICLE		Defective logic or analog	Check and replace logic or
		Indicator Light (yellow) is		board.	analog board.
		OFF, and vehicle detection
		tone does not sound.
	￿	Outbound audio distorted.		Defective analog board.	Check and replace analog
					board.
				Defective internal	Replace microphone.
				microphone.
				Defective menu sign	Replace menu sign speaker.
				speaker.

￿

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