722 User Guide and Technical Information
52
v. 2.67
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
DC input uses a 4-pin Hirose connector (Part # HR10-7P4P). There are two connection options avail-
able.
External DC Input Wiring
Operation
pin-2 to negative (–)
pin-3 to positive (+)
operates the on-board Li-ion charger when the unit is both turned on and off. Use when plugged
into AC power
pin-1 to negative (–)
pin-4 to positive (+)
operates the on-board Li-ion charger only when the unit is turned on—there is no external current
draw when powered off. Use when connecting to an external battery pack
Regardless of whether pins-1 and -4 or pins-2 and -3 are used, the unit will always charge the Li-ion battery when the unit is powered on.
Pin-1 and pin-2 of the external DC input are at the same ground potential as chassis and signal ground.
The voltage level of the source powering the unit is displayed on the main LCD screen in the up-
per left-hand corner (
). When the 722 senses a low voltage condition from an external
DC source the power LED and battery voltage display flashes, to alert the user. When the external
DC reaches 9 volts, the 722 will automatically switch over to the removable battery. If no battery is
installed the unit will shut down.
The included AC-to-DC power supply operates the unit and charges the removable batteries simul-
taneously. Pins-3 and -4 are wired to (+) and pins-1 and -2 are wired to (–).
When power is applied, the charging circuit evaluates the battery condition and supplies charg-
ing current, if necessary. When charging, the amber charge LED will flash. Once the battery is fully
charged, the charger will turn off and the amber charge LED will light solid, indicating a full charge.
Large capacity cells increase the charge time.
Charge LED Activity Description of Activity
Off
Charger disabled
On
Completed charge / battery fully charged
Blinking
Charger enabled / battery is charging
If the charge LED shows anything but a successful charge, the Li-ion battery may require replacement.
Time of Day Battery
The 722 has an internal NiMH LR6 (AA) battery to power to the time-of-day clock and date. This
battery is charged simultaneously with the Li-ion battery. The AA battery holds the time of day and
date for approximately 60 days.
Auto Functions with External Powering
The 722 can perform several functions when DC power is applied to and removed from the recorder.
Options available include:
•
Power on unit
– unit will turn on and be ready for operation.
•
Power on and begin recording
– unit will power on and begin recording with the settings
used when previously powered down.
•
Power on, power off unit
– external DC functions as the on/off switch.
•
Power on and begin recording, power off
– unit will power and begin recording, then turn off
when power is removed.
These functions are useful when the unit is part of a production kit powered by a single power
source. A single power switch can be used to power on the whole kit.
