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Warning! High current AC wiring regulations vary from one location to
another—do not attempt to connect the Nº33 to your AC
mains power without consulting a qualified local electrical
contractor. (See Operating Voltage in this manual for more
information.)
The Mark Levinson Nº33 has been safety-tested and is
designed for operation with a three-conductor power cord.
Do not defeat the “third pin” or earth ground of the AC power
cord.
An AC mains switch is located adjacent to the power cord on the rear
panel of the amplifier. This switch may be used to disconnect the supervi-
sory power supply from the AC mains without having to actually unplug the
amplifier from the wall outlet. Since this small supervisory supply controls
the main power supply’s access to AC power, shutting down the supervisory
power supply also disconnects the main supply from AC. If you plan to be
away for an extended period, or have any other reason to turn the amplifier
completely off, you may use the AC mains switch.
Note: When first connected to the AC mains, the amplifier normally
draws a small amount of power which is used to control the
power-up sequence. Turning this rear panel switch “off”
disconnects even this small power supply; you must turn this
switch back “on” before you can enter the power-up
sequence described in Front Panel, item #2, or before the
amplifier will respond to a remote turn-on command.
Two slo-blow 35 ampere fuses are located inside the Nº33, on the AC mains
module. The protection circuitry of the Nº33 has been designed such that
only a catastrophic failure could cause these fuses to blow. As a result, if
you suspect that your AC fuses have blown, disconnect the Nº33 from the
AC mains and contact your Mark Levinson dealer for assistance. Do not at-
tempt to replace these fuses yourself.
Danger! Potentially dangerous voltages and current capabilities exist
within the Nº33 power amplifier, even when disconnected
from AC mains. Do not attempt to open any portion of the
Nº33’s cabinet.
There are no user-serviceable parts inside the Nº33 power
amplifier. All service of this product must be referred to a
qualified Mark Levinson dealer or distributor.