Dual Monaural Power Amplifiers Operating Manual N 333 N 332 N 331

In addition, should a fault condition cause any amplifier’s protection cir-

cuitry to activate, it can report the nature of the problem to a linked Mark

Levinson preamplifier via this communications link. If this occurs, the

preamplifier will display the number of the amplifier at fault (AMP1 being

the first amplifier in the daisy chain, AMP2 being the second amplifier, and

so on). The preamplifier will also indicate the nature of the fault condition

with one of the following codes:

Code Fault Condition

HOT! thermal shutdown

DCO! uncorrectable DC offset

If upon first connecting your Link cables the system does not automatically

toggle the amplifiers from the preamp, you may have to cycle power (not

standby, but actual AC power) once to alert the system as to the presence

of the newly-established Links.

4 REMOTE TURN-ON INPUTS

Additional remote turn-on jacks provide compatibility with a wide range of

products, to facilitate remote turn-on and turn-off in systems which do not

include a Mark Levinson 30-series preamplifier (which would normally use

the Mark Levinson Communications Link described above). These

⁄8" (3.5

mm) “mini-jacks” allow other components to bring the power amplifier in

and out of standby. Two such mini-jacks are provided to allow “daisy-chain-

ing” of multiple amplifiers.

If this method of control is used for the amplifier(s), the last mini-jack in

the chain must be terminated with a dummy

⁄8" plug [that is, an empty

plug must be inserted into the final

⁄8" (3.5 mm) jack]. Even if only a

single amplifier is controlled in this fashion, the “extra” mini-jack must be

terminated.

If you are not using these turn-on inputs, you may leave them both empty

of any plugs.

This remote “trigger” input will be operated by a 3–12 volts DC positive-

polarity pulse, of at least 100 milliseconds duration, with tip polarity as

shown below:

Remote turn-on

tip polarity

+–

3-12 volts for at

least 100 mS

Receiving such a pulse will cause the amplifier to “toggle” between standby

and operate, much like pressing the front panel standby button. Sending a

long-term DC signal (more than one second) will force the amplifier into

the fully off condition (as does a prolonged press of the front panel but-

ton.) Your Mark Levinson dealer can help you take advantage of these de-

sign features to maximize your system’s versatility.