5
Operating mode cont.
Volume control can be performed by either moving the physical volume knob by hand or by using the
volume up/down buttons on the remote control. A single press of the volume up/down button will increase
or decrease the volume by 0.5dB. Pressing and holding the volume buttons will initially change the volume
by 0.5dB and after holding the button for greater than 1 second will cause the volume to continuously
increase or decrease for as long as the button is held down. Volume change by hand or by IR will cause the
indicator LED in the knob to light for 1.2 seconds.
The volume knob has detents at each of the 144 volume positions. The detents are performed in software.
The volume can be muted using the mute button on the remote control. Each button press toggles mute
on and off. There is no provision for applying mute from the front panel. When mute is active the knob
LED flashes briefly once every 3 seconds. In mute the IR volume change is inhibited however the volume
can be changed by physically moving the knob and when exiting mute, the volume will correspond to the
physical knob position.
Standby mode
Standby mode is activated by pressing the power button on the remote control. In standby mode the front
panel LEDs are turned off, input relays disconnected and power supplies turned off. In standby mode the
unit does not respond to any IR commands other than the power button. The front panel channel select
buttons are also inactive. The volume knob can still be moved by hand in standby mode and if it is, when
the amplifier comes out of standby the volume level will be whatever corresponds to the position of the
volume knob. The state of mute is remembered and the mute state is remembered and restored on exit
from mute.
Standby mode is exited by pressing the IR power button. This will start the power up sequence which takes
a while. During the power up sequence all front panel LED are on until operating mode is reached.
Balance mode
Balance setting mode is activated by pressing and holding the CURRENT selected input channel button for
3 seconds. During balance setting mode the volume knob becomes the balance setting indicator. The knob
will rotate to the position corresponding to the current balance setting. 12’oclock is centre balance. 6dB
left is at 9’ockock. 6dB right is at 3’oclock.
When the knob has reached the current balance position the knob LED will illuminate and remain on.
Balance can be changed by manually moving the volume knob. Detents at each balance position are
provided by software. Should the knob be moved past the 9’oclock to 3’oclock position no more detents
will be felt and the knob will apply a continuous torque back to the 3’oclock or 9’oclock positions.
IR CHUP/CHDN change the balance in 0.5dB steps. VOLUP/VOLDN change the volume in 0.5dB increments
and holding down the volume button for more than 1 second will activate volume autorepeat. A change
in balance or volume will be indicated by the knob LED flashing off briefly. During volume autorepeat the
LED remains off for the duration.
IR mute applies mute. When muted, IR volume up/down is inactive. In mute the knob LED blinks off briefly
every 3 seconds.
Any front panel button or IR POW will exit balance mode back to operating mode.
At exit of balance mode the balance setting is stored in EEPROM so the setting is remembered across
power cycles.
