Instruction manual

12
Preparations
AC adapter
To operate the unit with the AC adapter, connect it as shown below.
Important
To prevent the risk of damage, do not use any
AC adapter other than the NC-98 series.
DC IN
5-7 V
I/O
AC OUT
DC OUT
USB
SD
DC IN
connector
AC adapter NC-98 series
Open
the bottom cover
To AC outlet, 100 to 240 V AC, 50/60 Hz
Backup battery
The unit uses a backup battery (rechargeable battery) to operate the clock.
While power to the unit is on, the backup battery will be charged. It will also
be charged while power to the unit is off if external power is connected.
The relationship between charging time and retention period is shown below.
A full charge of the backup battery is achieved after 24 hours.
Charging time Retention period
1 hour 2 days
12 hours 30 days
24 hours 45 days
Use the AC adapter when connecting external power for battery charge while the
unit is turned off. The service life of the backup battery is limited. You should have
the battery replaced about once every five years. Please contact your supplier.
Note
The charging time, retention period and service life
of the backup battery may vary depending on the
operating condition.
When the backup battery is old, the retention period
will be shorter.