Studio Technologies 44 - Manual (Page 7)

Model 44 User Guide Issue 2, September 2006
Studio Technologies, Inc. Page 7
D-subminiature connection, located on the
Model 44’s back panel. Refer to Figure 4 for
connection details.
External DC Input
For flexibility, provision has been made
to allow an external source of 24 volts DC
to power the Model 44. The source must
be filtered and regulated, with a minimum
current capability of 1.2 amperes. The exter-
nal DC source is connected using two pins
on the female 25-pin D-subminiature con-
nector which is located on the Model 44’s
back panel. For connection details refer
to Figure 4.
The external 24 volt DC source can be used
instead of, or in addition to, the DC power
created by the two internal power supplies.
These three possible power sources are
safely connected together (diode “OR’d”)
within the Model 44’s circuitry.
match a location’s nominal AC mains volt-
age. For locations that have an AC mains
power source of 240 volts, contact Studio
Technologies for confirmation that a direct
connection can be made.
The Model 44 uses a 3-pin IEC 320 C14-
type inlet connector to mate with a detach-
able mains cord set. For units shipped to
North America and Japan a cord is sup-
plied that has a North-American (NEMA
15L) standard plug on one end and an IEC
320 C13-type connector on the other. Units
bound for other destinations require that
the appropriate cord set be obtained. The
wire colors 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
Earth/Ground (E) Green/Yellow
Safety Warning: The Model 44 does not
contain an AC mains disconnect switch.
As such, the AC mains cord plug serves
as the disconnection device. Safety
considerations require that the plug and
associated inlet be easily accessible to
allow rapid disconnection of AC mains
power should it prove necessary.
As soon as AC mains power is applied the
Model 44 will begin operation. An LED sta-
tus indicator is associated with each of the
two internal power supplies. Both should
light as soon as mains power is applied.
Operation
The Model 44 is designed for continuous
operation with no adjustment or mainte-
nance required. Three red-colored LEDs,
No
Connections + – Connect
Aux 24 Vdc Output 15 3 16
External 24 Vdc Input 1 14 2
Notes: 1) Connector type on Model 44 is 25-pin
D-subminiature female. Installer must provide plug
(male). Connector uses 4-40 threaded inserts for
locking with mating plug.
2) Wiring scheme follows TASCAM DA-88 convention.
Standard DA-88-style wiring harnesses are directly
compatible, with the exception of 4-40 screw threads
being required.
Figure 4. Connections for Auxiliary 24 Volt DC
Output and External 24 Volt DC Input
AC Mains Power
The Model 44’s two internal power supplies
operate directly from AC mains power of
100 to 230 volts, 50/60 hertz. The power
supplies are “universal input” type with
no switches to set or jumpers to install to