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Nº433 Power Amplifier
Front Panel
The numbers in the front-panel illustration shown below corre-
spond with the numbered items that appear below.
1. Indicator LED
Indicates the operating state of the Nº433 and provides diagnostic
information when a fault condition occurs.
* 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-circuit loudspeaker wire.
Refer to “Extensive Protection” on page 12 for additional infor-
mation about fault conditions. If the amplifier will not power on at
all (even to sleep mode), check the ~ac mains connections or have
an authorized Mark Levinson dealer inspect the internal fuses
(which are not user-serviceable).
power
standby
DUAL MONO AMPLIFIER
Nº432
2
31
LED Behavior Description
Fully lit Amplifier is powered “on.”
Slowly blinking Amplifier is in standby.
Dimly lit Amplifier is in sleep mode.
Not lit Amplifier is powered “off.”
Rapidly blinking
(on most of the time)
A power-related fault has occurred.
Rapidly blinking
(on half of the time)
A signal-related fault* has occurred.
Rapidly blinking
(off most of the time)
A thermal-related fault has occurred.