User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 41
for Surround
allows adjustment of the post-fader moni-
tor output level. Two buttons, along with
associated LEDs, provide access to the
dim and reference level functions. A sta-
tus LED lights steadily whenever normal
Model 71 operation is taking place.
Any changes made using the Model 71’s
rotary level control and buttons will be
reflected in the appropriate LEDs and dis-
plays on all the connected Model 790 and
Model 71 units. And, as expected, changes
made using a Model 790 will be reflected
in the Model 71’s LEDs.
In some applications it may be desirable to
disable operation of a Model 71’s dim and
reference buttons. An example could be
where non-technical personnel are allowed
only to use the rotary level control. A con-
figuration parameter, previously described
in the Model 71 Control Console Configu-
ration section of this user guide, allows
button operation to be disabled.
Rotary Level Control
The rotary level control is used to manually
adjust the post-fader monitor output level.
Its operating characteristics are identical to
the rotary control in the Model 790 Control
Console, discussed earlier in this section.
Dim
The dim function allows the post-fader
monitor output level to be reduced by a
fixed amount. Its operating characteristics
are identical to those of the Model 790
Control Console, discussed earlier in this
section.
An indication is provided should the dim
button be pressed when button operation
has been disabled. Its associated LED will
flash briefly but no operating change will
occur. The LED will continue to display the
status of the dim function as selected by
other Model 790 and Model 71 units.
Reference Level
The reference level button sets the post-
fader monitor output level to the preset
value. The operating characteristics are
identical to those of the Model 790 Control
Console, discussed earlier in this section.
An indication is provided should the ref-
erence button be pressed when button
operation has been disabled. The associ-
ated LED will flash briefly but no operating
change will occur. The LED will continue
to display the status of the reference level
function as selected by other Model 790
and Model 71 units.
Technical Notes
Loss of Sync
The Model 780-01 relies on an external
timing reference (sync) source for proper
operation. This can be in the form of an
AES3, word clock, DARS (AES11), bi-level
video, or tri-level video reference signal. In
many cases the sync signal will be con-
nected to the sync input BNC connector
located on the Model 780-01’s back panel.
Alternately, a configuration choice allows
the L/R input of the currently selected input
source to also serve as the system’s timing
reference. Whenever a valid sync signal
has been connected to the Model 780-01
the sync status LED, located on the unit’s
front panel, will light. The sample rate of
the monitor output channels will reflect the
rate of the sync input and, if a video sync
source is utilized, the configured rate.
If a valid sync signal is not present sev-
eral visual indications are provided. On
the Model 780-01 the sync status LED will