Studio Technologies Gen II - Manual (Page 4)

Issue 3, July 1991 Generation II User Guide
Page 6 Studio Technologies, Inc.
Remove the Cover(s)
The following procedures must be
performed by a qualified technician.
Operating the Generation II with
the top and/or bottom cover removed ex-
poses the technician to points in the power
input section with hazardous voltages.
Ensure that the power cord is removed from
the power connector on the back panel.
Remove the top cover. Four Phillips head
screws hold the top cover to the side rails.
If an input load resistor is going to be in-
stalled, remove the bottom cover. Four
Phillips head screws hold the bottom cover
to the side rails.
Please Note: Do not touch any potentiom-
eter on the circuit board or factory calibra-
tion may be required.
Input Load Resistor
The input impedance of the Generation II is
25k ohms. In some cases, an input termina-
tion resistor, with a value such as 150 ohms
or 600 ohms, may be desired. Provision has
been made for an input resistor to be in-
stalled in the Generation II’s circuit board.
The resistor is shown on the schematic
connected to pins 2 and 3 of the input
connector. It is labeled R2 on the circuit
board’s legend. Carefully insert the desired
resistor into the circuit board and solder the
connections. Using diagonal cutters, trim
the excess resistor lead. You may want to
label the back panel with the revised input
impedance.
Configuration Switches
The Generation II is designed to accept
nominal audio signal levels of 0, +4, or
+8dBu. Set the desired input level using the
3-position switch located on the left side,
toward the back of the circuit board.
The Generation II is designed to produce
nominal audio signal levels of 0, +4, or
+8dBu. Set the desired output level using
the 3-position switch located in the center,
toward the back of the circuit board.
The system status switch sets the way the
Generation II operates. This switch is lo-
cated on the left side, near the front of the
circuit board.
In the front panel position, the front panel
controls are enabled.
In the fixed — music position, the front
panel controls are disabled, and the unit
operates in the music mode.
In the fixed — music & voice position, the
front panel controls are disabled, and the
unit operates in the music & voice mode.
Replace the Cover(s)
Carefully replace the top and, if removed,
bottom cover using the screws that were
previously removed.
Mounting
The Generation II Stereo Simulator is rack-
mountable, requiring one standard rack
space (1.75 inches) in a standard EIA 19.00
inches rack. Keeping the Generation II
relatively cool will enhance operating life.
Most electronic equipment failures are
power-supply related. Power supplies tend
to generate heat which, when not ad-
equately controlled, toast the power supply,
dry out electrolytic capacitors, etc. Keeping
all equipment relatively cool will reduce the
likelihood of problems occurring.