Yamaha A-U671 Owner's Manual page 7

NAMES AND FUNCTIONS OF THE PARTS
8 USB DAC indicators
Lights up when audio signals are input to the USB jack of this unit (+page 12).
9
PURE DIRECT indicator
Lights up when the PURE DIRECT function is turned on (+page 13).
0
INPUT button and indicator
Each time you press the button, the input source switches to LINE or USB. The input
source indicators light up when the corresponding input sources are selected.
Press and hold the button to switch the PURE DIRECT function on or off.
A
Remote control sensor
Receives infrared signals from the remote control.
4
En