Details of the emergency mode (with limited functions)

This unit monitors the USB bus power supply voltage. If the consumption current increases under non-guaranteed usage conditions, the drop in voltage is detected, the headphones’ maximum output level is limited and the consumption current is set to 500 mA or less. When operating in the emergency mode (with limited functions), [DECK] buttons [A], [B], [C] or [D] flash.

In this case, normal operation is restored automatically when the connected headphones are disconnected or when the power is turned off then back on.