Studio Technologies 76DBA V.3.00 - Manual (Page 18)

Issue 1, November 2010 Model 76DBA/77B User Guide
Page 18 Studio Technologies, Inc.
for Surround
IEC 320 C13 socket on the other. Units
bound for other destinations require that
the appropriate cord be used. The wire col-
ors in the mains cord must conform 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 76DBA
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 easily
accessible to allow rapid disconnec-
tion of AC mains power should it prove
necessary.
As soon as mains power is applied the
Model 76DBA will perform a power-up
sequence. The three LEDs on the right
side of the front panel will individually light
in a rapid right-to-left test sequence. Then
the LEDs will flash in cadence while the
firmware loads into the Model 76DBA’s
main logic device. After just a few seconds
initial system operation will commence and
the three LEDs will perform their intended
functions. Once operating data is being
interchanged with the one or more con-
nected Model 77B or Model 71 Control
Consoles the control console status LED
will also light. If a source of metadata has
been connected and valid data is present
the metadata 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 77B units will go
through a power-up sequence, lighting
each of its LEDs in succession. Using
its 4-digit display, each Model 77B will
then momentarily display its address, its
software version, and the main and logic
device software versions of the associated
Model 76DBA.
All connected Model 71 units will also go
through a power-up sequence after mains
power is applied to the Model 76DBA.
Each of the Model 71’s three LEDs will
light momentarily. After these LEDs have
been lit, the device address will be shown
briefly using the dim and reference level
LEDs, as shown in Figure 8 in the Opera-
tion section. When this is complete the
Model 71 will begin normal operation and
its status LED will light if communication is
established with the Model 76DBA. 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 connected properly.
Should an error be detected during the
start-up process the two LEDs on the
Model 76DBA’s front panel will continue
to flash in cadence indefinitely. On the
Model 77B units a diagnostic code may
be displayed. Refer to the Technical Notes
section of this user guide for details.
Only after the Model 76DBA and all
connected Model 77B and Model 71 units
have correctly powered up will full system
operation begin. It’s possible that audio
signals will first be present on the digital
monitor outputs. The analog monitor out-
puts will only become active after a protec-
tion interval has elapsed. These outputs
are muted using electro-mechanical relays
that operate under software control.