Model 85 User Guide
Issue 3, November 1999
Studio Technologies, Inc.
Page 11
If the Model 85 Doesn’t Work At All
A source of AC mains power must be
connected to the Model 85. Depending on
the version you have purchased, 100, 120,
or 220/240Vac, 50/60Hz is required.
Confirm what mains voltage is required by
observing the selection boxes to the left
of the AC mains connector on the back
panel. Whenever mains power is con-
nected the power present LED should be
lit. If the LED is not lit confirm that the
main power source is active (“hot”) and
that the connector on the cord is securely
mated with the plug on the back panel.
For safety in the event of a major internal
failure or the connection of incorrect AC
mains voltage, the Model 85 contains a
fuse inside the cabinet. The fuse will open
(“blow”) if the failure of an internal compo-
nent causes excessive current to be drawn
from the internal power supply. The fuse
will also open should 220/240Vac be
connected to a Model 85 that is configured
for 100 or 120Vac operation. The fuse is
intended to be replaced only by a qualified
service technician. This person will have
the training to safely access the “guts” of
the Model 85 and identify where a problem
is located.
If Signal Doesn’t Seem to Be Present
on the Outputs
Valid outputs depend on a valid input
source. Ensure that the signal present
LEDs are lit in response to what you
consider valid input signals. Should a
signal present LED not be lit confirm that
the source is operating and the cabling
has been correctly prepared. On the front
panel, check the output source selection
switches to confirm the correct settings.
