AUSTRALIAN MONITOR AMIS250 Series, Руководство по обслуживанию

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Phantom Power
This button enables or disables the 15 volts DC phantom power to all microphone inputs XLR’s. Do not
plug an unbalanced microphone in any amplifier or mixer when phantom power is switched on.
The phantom voltage is connected through 4k7 1/4W resistors. The maximum current draw available per
microphone is approximately 3mA.
Line Output
The balanced XLR line level output provides a maximum of 700mV to allow for the connection of up to 6
power amplifiers. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin 3-signal (cold -).
The output is electronically balanced with an inverting op-amp and buffered with voltage follower op
amps. Neither hot nor cold output should be grounded when connecting as unbalanced.
Tape Output
Dual RCA output connectors provide a line level output with a maximum of 350mV into 10k Ohms. This
output is sourced before the master gain control so the tape output level is not influenced by the operation
of the master gain control.
Microphone Inputs
All four inputs are dual mic/line with microphone inputs being via a 3 pin XLR connector per channel. The
mic input sensitivity is 1mV @ 200 ohms. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin 3-
signal (cold -). Phantom power of +15 volts is available on all microphone inputs. Reading from left to
right across the rear panel, the inputs are 6,5,4, 3, 2, & 1.
Line Inputs
Line inputs 1, 2, 3, 4, & 5 have an input sensitivity of 150mV @ 100K ohms. Input 6 has an input
sensitivity of 300mV @ 220K ohms making it suitable for high level inputs such as a CD player. Reading
from left to right across the rear panel, the connections are for inputs 6, 5, 4, 3, 2, & 1 respectively.
[600 Ohm Telephone Input] (115V version)
The 600 ohm transformer balanced Telephone Input is summed with input 2 through 100k ohms.
The input sensitivity is 150mV (driving the amp to full power)
Insert Point
The Insert Point is located electronically after the master volume pot and before the balancing circuit for
the power amp and line output.
The Insert Point is a 3 conductor (Tip, Ring, Sleeve) phone socket which accepts a standard stereo 6.35mm
(1/4”) jack. The connections are:
Tip
Amplifier in.
Ring Mix Output.
Sleeve Ground
The switched contacts are used to break the signal internally.
When an external processor is used via the insert point, it only affects the power amplifier section and line
output of the AMIS60 &AMIS120. The tape output remains unprocessed.
Tone Generators