User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 15
for Surround
AC Mains Power
The Model 780-01 operates directly from
AC mains power over a range of 100 to
240 V, 50/60 Hz. Being a “universal in-
put” device, there are no switches to set
or jumpers to install to match a location’s
mains voltage. The unit uses a 3-pin IEC
320 C14-type inlet connector to mate with
a detachable mains cord. All units are sup-
plied with a mains cord that has a North-
American-standard plug (NEMA 5-15L) on
one end and an IEC 320 C13 socket on the
other. Units bound for other destinations will
require that the appropriate cord be used.
The wire colors in the mains cord must con-
form to the internationally recognized color
code and should be terminated accordingly:
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Protective Earth (E) Green/Yellow
Safety Warning: The Model 780-01
does not contain an AC mains discon
-
nect switch; the AC mains cord plug
serves as the disconnection device.
Safety considerations require that the
plug and associated outlet be eas-
ily accessible to allow rapid discon-
nection of AC mains power should it
prove necessary.
As soon as mains power is applied the
Model 780-01 will perform a power-up
sequence. The two LEDs on the right side
of the front panel will momentarily light in a
test sequence. Then the two LEDs will flash
in cadence while the firmware loads into
the Model 780-01’s main logic device. After
a few seconds initial system operation will
commence and the two LEDs will perform
their intended functions. Once operating
data is being interchanged with the one
or more connected Model 790 or Model
71 Control Consoles the control console
status LED will light. The sync status LED
will light if a valid sync source has been
recognized. The sync status LED will flash
if a valid sync source is not recognized.
Also upon application of mains power, all
connected Model 790 units will go through
a power-up sequence, lighting each of its
LEDs in succession. Using its 4-digit dis-
play, each Model 790 will then momentarily
display its address, its software version,
and the main and logic device software
versions of the associated Model 780-01.
All connected Model 71 units will also go
through a power-up sequence after mains
power is applied to the Model 780-01.
Each of the Model 71’s three LEDs will
light momentarily. After these LEDs have
lit, the device address will be shown briefly
using the dim and reference level LEDs, as
shown in Figure 8 in the Configuration sec-
tion. When this is complete the Model 71
will begin normal operation. Its status LED
will light if communication is established
with the Model 780-01. If the Model 71’s
status LED does not light check to see if
there is a device address conflict among
all connected control consoles and that all
cables are implemented properly. Refer to
the Configuration section of this user guide
for details on selecting the device address.
Should an error be detected during the
start-up process the two LEDs located on
the right side of the Model 780-01’s front
panel will remain flashing in cadence. On
the Model 790 units a diagnostic code may
be displayed. Refer to the Technical Notes
section of this user guide for details.