Troubleshooting

Under different circumstances, the front panel LED lights green or amber, which provides diagnostic information.

Power LED	Problem Description	Problem Solution
Color

Amber	No output signal.	• No input detected: verify that there is an
		input signal.
		If a signal is present, raise the input level.
		• The amplifier is in standby mode and the
		output has been turned off. Check the
		remote port.

Green or	Slow to exit standby	• The input signal may be too weak. Raise
Amber	mode when a signal is	the input level.
	present.

Power LED	Problem Description	Problem Solution
Color

Green or	Enters standby mode	• The input signal may be too weak. Raise
Amber	early.	the input level.

MPA 401-70V and MPA 401-100V • Setup and Operation

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Contents

Audio MPA 401 SeriesMini Power Ampliﬁers User Guide Instructions de sécurité Français Safety InstructionsSafety Instructions English Chinese Simplified（简体中文） FCC Class B Notice Conventions Used in this Guide Specifications AvailabilityNotifications Rear Panel and Cabling ContentsSetup and Operation Introduction MPA 401-70Vand MPA 401-100V Contents Introduction Important Safety InstructionsImportant Safety Instructions MPA 401-70Vand MPA 401-100VFeatures Figure 1. Typical Application for the MPA MPA 401-70Vand MPA 401-100VDescription MPA 401-70Vand MPA 401-100V Introduction MPA 401-70Vand MPA 401-100VFeatures Rear Panel Rear Panel Power Input Audio InputsRemote Input Connector Speaker Connections Rear Panel and Cabling Power Input Audio Inputs Remote Input Port Wiring for remote controlPage Speaker Connections Setting Bass and Treble Remote Control Options Setup and OperationFront Panel Features Front Panel Features Setting Input Level Setting Bass and Treble Setting Input Level Extron SI 3CT LP Remote Control OptionsMPA 401-70Vand MPA 401-100V Setup and Operation Extron MPA Amplifier Fails to Exit Standby Mode Promptly TroubleshootingAmplifier Enters Standby Mode Too Early Mounting Plenum PlacementTabletop Placement Reference Material Under-desk, Through-desk,and Projector Mounting Rack Mounting Procedure Extron Warranty