Studio Technologies 740 - Manual (Page 10)

Issue 3, May 2004 Model 740 User Guide
Page 10 Studio Technologies, Inc.
Model 740
740’s 3-pin IEC 320 C14-compatible inlet
connector.
Mic/Line Inputs
The Model 740 contains six input channels
that are compatible with microphone or
line-level sources. Each input uses a 3-pin
female XLR-type connector. Prepare the
mating connectors (males) so that pin 2
is signal high (+ or hot), pin 3 is low (– or
cold), and pin 1 is shield.
It’s possible that some of the mic/line
inputs will be wired to an input/output
(I/O) panel located on the side or rear of
a broadcast vehicle. If this is the case, it’s
also nice to have one or two of the inputs
“multed” to connectors inside the vehicle.
This will allow the rapid connection of
microphone or line-level signals during
specialized situations. For example, during
inclement weather on-air talent may wish
to connect a microphone to the Model 740
from inside a vehicle.
To minimize potential problems, it is
recommended that microphone-level
signals connected to the mic/line inputs
not be wired by way of points on an audio
patch bay. It certainly can be done, but
the potential for intermittent connections,
especially in mobile applications, may
significantly increase.
equipment. It is located at the far right side
of the unit, and may need to be physically
isolated from sensitive equipment such
videotape recorders.
During normal operation, access to the
Model 740’s back panel is not required.
However, there is one trim potentiometer
that may need to be adjusted prior to the
Model 740 going into service. This trim pot
sets the level of the reference tone direct
output. Please refer to the Post-Installation
Calibration section of this guide for details.
Mounting
The Model 740 is intended for mounting
in a standard 19-inch equipment rack,
requiring 1.75 vertical inches (one stan-
dard rack space). It weighs approximately
7.0 pounds (3.2 kg) and operates on
mains power of 100, 120, or 220/240 V,
50/60 Hz. The maximum operating power
is less than 24 watts. Four mounting
screws, two per side, are used to secure
the unit into the equipment rack.
Connections
The Model 740’s input and output con-
nections are made using 3-pin XLR-type
male and female connectors and ¼-inch
3-conductor phone jacks. AC mains power
is connected by means of a detachable
cord set that is compatible with the Model
Detail of back panel showing mic/line input connectors