Sound Devices 744T - Manual (Page 63)

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To disconnect the 744T from FireWire:
1. Make certain that any software applications that reference the 744T drive are closed and that all file
copy functions to and from the 744T have completed.
2. In Mac OS X highlight the drive icon on the desktop and select -e to eject the volume. Alternatively,
drag the drive icon to the trash in the dock.
2. In Windows, right-click the drive icon and select “eject.”
3. The cable between the computer and 744T can now be disconnected. If a future connection is going to
be made the cable can be left connected.
If the 744T is disconnected from the computer via an eject command and the FireWire cable is still
physically connected between the computer and recorder, the data connection can be made by enter-
ing the setup menu select FIREWIRE: CONNECTION. Alternatively, press the STOP key and HDD key
together to begin a FireWire connection.
Do not remove the CompactFlash card while FIREWIRE CONNECTION appears in the LCD.
Powering
The 744T is powered from either removable, Li-ion rechargeable batteries or external DC power. The
included, removable 7.2 V Li-ion cell can be used as a primary or backup power source. The 744T
automatically chooses the power source based on the voltage level of the external power supply. If
it falls below a factory-set threshold, the unit will transition to Li-ion power. The transition between
external and removable battery powering is seamless and has no affect on recording or playback
operation.
During typical operation the 744T will run for approximately four hours from the included 4800
mAh Li-ion battery.
Lithium Ion Rechargeable Battery
The 744T is compatible with Sony-mount L- or M-type Li-ion rechargeable batteries. Numerous pow-
er capacities are available in these battery types, ranging from 1000 mAh to 7000 mAh. The 744T’s
mount accommodates unlimited battery depth. Larger amp-hour cells provide more run time.
When powered by the removable Li-ion battery the LCD displays the battery voltage. The nominal
operating voltage for Li-ion batteries is 7.2 V, with operating voltages ranging between 6.5–8.5 V.
When the battery drops to 6.5 V, the LCD voltage display and the power LED begin flashing to warn
that the battery is nearly depleted. When the voltage reaches 6.3 volts the 744T will power down—
any recordings in-process will automatically be closed (stopped).
External Powering and Battery Charging
The 744T can be powered externally from 10–18 VDC (2 amp minimum). External DC fully pow-
ers the unit and charges an attached Li-ion battery simultaneously using the 744T’s onboard Li-ion
charger. The charger circuit operates whenever the unit is powered on and optionally when the unit
is off, depending on the external power wiring ( see below ).
DC input uses a 4-pin Hirose connector (Part # HR10-7P4P). There are two connection options avail-
able: