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.
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.
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.
