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power
standby
DUAL MONO AMPLIFIER
Nº432
2
31
Front Panel
The numbers in the front panel illustration shown above correspond
with the numbered items that begin below.
1. Indicator LED
Indicates the operating state of the Nº432/431 and provides
diagnostic information when a fault condition occurs.
LED Behavior Description
Fully lit Indicates that the power amplifier is
powered “on.”
Slowly blinking Indicates that the power amplifier is in
standby.
Dimly lit Indicates that the power amplifier is in
sleep mode.
Not lit Indicates that the power amplifier is
powered “off."
Rapidly blinking Indicates that a power-related fault
(on most of the time) has occurred.
Rapidly blinking Indicates that a signal-related fault*
(on half of the time) has occurred.
Rapidly blinking Indicates that a thermal-related fault
(off most of the time) has occurred.
* Signal-related faults include significant DC offset at the output due to either
DC in the input signal or a failed component within the amplifier OR excessive
current demands due to a short-circuited loudspeaker wire.
Refer to “Extensive Protection” for additional information about
fault conditions. If the amplifier will not power on at all (even
to sleep mode), check ~ac mains connections or have an
authorized Mark Levinson dealer inspect the internal fuses
(which are not user-serviceable).