E-10
Fault status indicators
e LED patterns below indicate the following fault conditions:
LED status Description Amplier action
All LEDs are green is is the normal operating state of the amplier. None
During power up all LEDs stay red for an extended time e amplier is waiting for the DC oset fault lines to
clear. A DC oset fault can occur if an excessive DC
voltage is present at the output of the pre-amp feeding
the P777. Normal operation resumes if the lines clear in
20 seconds.
To verify excessive DC oset voltage, remove the
interconnect leads (with the P777 switched o) and turn
on the P777. e fault should have cleared.
During power up or normal operation, one or more
LEDs are ashing green, with the remaining LEDs solid
red
e DC fault cannot be cleared. e channels with the
ashing green LEDs represent the amplier modules that
have a DC oset fault. Alternatively, a DC oset fault has
reoccurred on the same channel within 12 seconds of a
previous DC oset fault clearance.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger does
NOT reset the amplier).
During power up or normal operation, one or more
LEDs are ashing green, with the remaining LEDs NOT
solid red
e amplier is attempting to clear a DC oset fault on a
channel with the ashing green LED.
e amplier mutes the channel with the fault and its
paired channel. e amplier stays in this state for up
to two seconds or until the fault clears (whichever is
sooner).
During power up or normal operation, one or more
LEDs are ashing red, with the remaining LEDs solid
red
A short circuit fault cannot be cleared. e ashing red
LEDs represent the amplier modules with a short circuit
fault. Alternatively, a short circuit fault has reoccurred on
the same channel within 12 seconds of a previous short
circuit fault clearance.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, one or more
LEDs are ashing red, with the remaining LEDs NOT
solid red
e amplier is attempting to clear a short circuit fault on
a channel with the ashing red LED.
e amplier mutes the channel with the fault and its
paired channel. e amplier stays in this state for up
to half-a-second or until the fault clears (whichever is
sooner).
During power up or normal operation, one or more
LEDs are ashing amber
e amplier is attempting to clear an over temperature
fault on a channel with the ashing amber LED.
e amplier mutes the channel with the fault and its
paired channel and the fan is set to maximum speed. e
amplier stays in this state until the channel has cooled.
During power up or normal operation, one LED is
ashing amber, with the remaining LEDs solid red
An over temperature fault has reoccurred on the same
channel within 12 seconds of a previous over temperature
fault clearance. e ashing amber LEDs represent the
amplier modules with an over temperature fault.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, all the LEDs are
ashing amber
e amplier is attempting to clear an over temperature
fault on more than one channel, or the power
transformers have overheated.
e amplier mutes all channels and the fan is set to
maximum speed. e amplier stays in this state until all
channels have cooled, or the transformer has cooled.
During normal operation, all the LEDs are solid red An over temperature fault has reoccurred on one or more
channels, or the power transformers have overheated
within 12 seconds of a previous over temperature fault
clearance.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, one or more
LEDs are ashing amber, with the remaining LEDs
ashing green
A DC oset fault occurred on one or more channels
while attempting to clear a multiple over temperature
fault.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger does
NOT reset the amplier).
During power up or normal operation, one or more
LEDs are ashing amber, with the remaining LEDs
ashing red
A short circuit fault occurred on one or more channels
while attempting to clear a multiple over temperature
fault.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).