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744T User Guide and Technical Information
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firmware v. 1.04 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
The voltage level of the source powering the unit is shows on the LCD ( ). When the
744T senses a low voltage condition from an external DC source the power LED and battery voltage
display fl ashes, to alert the user. When the external DC reaches 9 volts, the 744T will automatically
switch over to its removable battery. If no battery is installed the unit will shut down.
The included AC-to-DC power supply can run the unit and charge removable batteries simultane-
ously.
Charging
The 744T has a battery charger for the Li-on battery. The charger is active when 10–18 VDC is applied
to pins 2 (–) and 3 (+) of the Hirose connector. When power is applied, the charging circuit evaluates
the battery condition and supplies charging current, if necessary. When charging, the amber charge
LED will fl ash. Once the battery is fully charged, the charger will enter a trickle mode to maintain
the battery. The charge LED fl ashes to indicate the status of the charging circuit. The chart below
describes the different fl ashes and their meanings:
Charge LED Activity Description of Activity
Off Charger disabled
On Completed charge / battery fully charged
1 blink Charger enabled / battery is charging
2 blinks No Li-ion battery attached
3 blinks High/low internal temperature state
4 blinks Battery level error code (>15 min. in slow mode)
5 blinks 8 hour time limit error code
If the charge LED shows anything but a successful charge, the Li-on battery may require replacement.
Time Code Master Clock Battery
The 744T has an internal NiMH LR6 (AA) cell providing power to the time code generator circuitry
and time-of-day clock. This battery is charged simultaneously with the Li-on battery. With a fully
charged battery, accurate time code will be held for to eight hours after power down. Because of this
battery the 744T can be powered down without worry of time code jumps or inaccuracy. When the
NiMH battery is near exhaustion, the time code generator will shut off and the time-of-day clock
keep running for up to one month.
744T will maintain accurate time code for 8 hours after power-down as long as the NiMH battery is
charged.