Mark Levinson 433 owner manual Front Panel, Indicator LED

Nº433 Power Amplifier

Front Panel

The numbers in the front-panel illustration shown below corre- spond with the numbered items that appear below.

DUAL MONO AMPLIFIER

Nº432

standby

power

1 2 3

1. Indicator LED

Indicates the operating state of the Nº433 and provides diagnostic information when a fault condition occurs.

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	A power-related fault has occurred.
(on most of the time)
Rapidly blinking	A signal-related fault* has occurred.
(on half of the time)
Rapidly blinking	A thermal-related fault has occurred.
(off most of the time)

*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.

13

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).