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Arcam P777 Manual

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E-10
Fault status indicators
e LED patterns below indicate the following fault conditions:
LED status Description Amplier action
All LEDs are green is is the normal operating state of the amplier. None
During power up all LEDs stay red for an extended time e amplier is waiting for the DC oset fault lines to
clear. A DC oset 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 oset 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 amplier modules that
have a DC oset fault. Alternatively, a DC oset fault has
reoccurred on the same channel within 12 seconds of a
previous DC oset fault clearance.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger does
NOT reset the amplier).
During power up or normal operation, one or more
LEDs are ashing green, with the remaining LEDs NOT
solid red
e amplier is attempting to clear a DC oset fault on a
channel with the ashing green LED.
e amplier mutes the channel with the fault and its
paired channel. e amplier 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 amplier 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 amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, one or more
LEDs are ashing red, with the remaining LEDs NOT
solid red
e amplier is attempting to clear a short circuit fault on
a channel with the ashing red LED.
e amplier mutes the channel with the fault and its
paired channel. e amplier 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 amplier is attempting to clear an over temperature
fault on a channel with the ashing amber LED.
e amplier mutes the channel with the fault and its
paired channel and the fan is set to maximum speed. e
amplier 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
amplier modules with an over temperature fault.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, all the LEDs are
ashing amber
e amplier is attempting to clear an over temperature
fault on more than one channel, or the power
transformers have overheated.
e amplier mutes all channels and the fan is set to
maximum speed. e amplier 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 amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
During power up or normal operation, one or more
LEDs are ashing amber, with the remaining LEDs
ashing green
A DC oset fault occurred on one or more channels
while attempting to clear a multiple over temperature
fault.
e amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger does
NOT reset the amplier).
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 amplier shuts down. e power switch must be
cycled to reset the amplier (cycling the trigger resets the
amplier).
… 10 …


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