Harman Kardon HKD3400 Owner's Manual page 11

Indicates that power cord is
connected to an AC receptacle
and that the unit is switched
off. (HK3400 only) -
Indicates AM or FM
band and frequency
of the tuned station. ~
DISPLAYS
Flashes during the period
when a station can be
entered into memory.
MHz PRESET
Remote Sensor
Shows when a Preset
station is selected.
Shows stereo broadcast
is being received.
Shows Seek function
STEREO is on and stereo
Indicates station is
properly tuned.