Madrigal Imaging N33, power amplifier manual Code Fault Condition

(any Mark Levinson transport)

			slave out
display
intensity
		mode
			DISC DRIVE
polarity	aes/ebu	emphasis	COMPACTNº 37
invert	1234	56 teach ir	standby
digital output			slave in

					Link
					cable
	digital input				master
Nº36	display
	intensity
	invert	1234	56	teach ir	standby
			mode
		aes/ebu	emphasis		DIGITAL PROCESSOR
	polarity				Nº 36

analog output

Link

cable

any input	slave
Nº38	standby
	PREAMPLIFIER
	Nº38

master

Link

cable

slave in

Nº33

Link slave in cable slave out

Remote turn-on tip polarity

To Nº38 Master	To Nº33 Slave In
Locking tab	Locking tab

A different Link connector configuration is used for the “daisy-chain” of one amplifier to the next, to minimize the opportunity for mis-wiring. In effect, this cable is identical to the one between preamplifier and power amplifier except that it uses pins 1 through 6 of an eight-conductor modular connec- tor at one end, as shown below:

To Nº33 Slave Out	To Nº33 Slave In
Locking tab	Locking tab

(Note that the pins are numbered 1 through 8 from left to right when the locking tab is down and the metal contacts are pointing away from you.)

When connected in this manner, the power amplifiers will be toggled be- tween standby and fully on when the preamplifier goes between standby and fully on. In addition, should a fault condition cause the amplifier’s pro- tection circuitry to activate, the Nº33 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
ZAP!	excessive output current

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 1⁄8" (3.5

mm)“mini-jacks” allow other components to bring the Nº33 power amplifi- ers in and out of standby. Two such mini-jacks are provided to allow “daisy-chaining” of multiple amplifiers. When “daisy-chaining” multiple am- plifiers, the last mini-jack in the chain must be terminated with a dummy 1⁄8" plug [that is, an empty plug must be inserted into the 1⁄8" (3.5 mm) jack].

This remote “trigger” will be operated by a 3–12 volts DC positive-polarity pulse, of at least 100 milliseconds duration, with tip polarity as shown be- low:

–+

3-12 volts for at least 100 mS

19