9
4.4
S
YSTEM
S
TATUS
I
NDICATION
(F
AULT
M
ODES
)
The system has a number of status indicators and FAULT modes which are indicated with the red LED in
the ON-OFF button. You will probably never need to know about these, but they are summarized here in
case you do. Most problems can be resolved by restarting the amplifier with the ON-OFF button. If that
doesn’t work, try turning off the amplifier completely with the POWER switch, waiting until 10 seconds
after the red “sleep” LED goes out, then turning the POWER switch back on and restarting the amplifier
with the ON-OFF button.
System Status LED
(ON-OFF button)
Sleep LED
Condition
Off
On
The amplifier is in standby (or “SLEEP”) mode. This is not a fault
condition. Press the ON-OFF button to start the amplifier.
On
On
The amplifier has shut down due to a FAULT condition. This could
be caused by overheating, an offset error, or a bias error. If the
amplifier seems unusually warm, let it cool, then push the ON-OFF
button to restart. See Section 4.3. An offset error or a bias error
probably indicates the need for vacuum tube replacement, see
Section 5.2.
Flashes twice
slowly on turn-on
Off
Indicates that automatic-power-off mode has been disabled. See
Section 4.2.
Flashes four times
quickly on turn-on
Off
Indicates that automatic-power-off mode has just been enabled.
See Section 4.2.
Flashes once every
second for a
minute.
Off (then
On after
SLEEP
occurs)
In automatic-power-off mode, an indication that the amplifier is
about to go to SLEEP because no input signal is detected. Apply a
signal or press any source button (MUTE or 1-5) to keep the
amplifier awake for another 30 minutes.
Flashes once every
ten seconds while
the amplifier is
operating
Off
Indicates that the microcontroller has detected an output offset
greater than approxi/- 0.12V. This probably means that
one of the 5751 vacuum tubes needs offset adjustment or
replacement. The amplifier will continue to operate. If the output
offset exceeds approxi/- 0.5V, the amplifier shuts down
due to a FAULT condition. See Section 5.2.
4.5
W
IRELESS
R
EMOTE
C
ONTROL
The remote should work anywhere in the house, with no need to point it at the Minotaur. If it doesn’t,
make sure that the antenna (packed in the same bag as the remote control) has been threaded onto the
antenna input on the rear of the amplifier. Also, be sure to press and hold the buttons on the remote
control for at least 1/5
th
of a second. If you press the button too quickly, it may not register.
