Cortelco 879015-TP2-27S Operating Instructions Manual page 9

Power Supplies
This unit is designed to operate from an AC-DC adaptor with a 9VDC 100mA output. This may be supplemented
with 3 x 1.5V 'AAA' (UM-4) batteries for backup to maintain the caller ID memory during line power interruption.
A. Operating from the AC-DC Adaptor
This unit should always be used with the included AC-DC adaptor.
1. Insert the adaptor's plug into the DC Power Jack at the back of the base.
2. Plug the AC-DC adaptor into a 120V AC 60Hz electrical outlet as shown in Figure 1. When the AC-DC
adaptor is in use, the batteries will not be drained.
3. If the unit is not to be used for an extended period of time, unplug the AC-DC adaptor from the mains and
the unit. Also remove the batteries from inside the battery compartment.
B. Installing the Batteries
1. Unscrew and open the battery cover located on the bottom of the
base. Please note this construction is for compliance with safety
regulations. Install the batteries according to Figure 2.
IMPORTANT:
2. For better performance and longer operating time, we recommend the use of alkaline batteries.
(a) Do not mix old and new batteries.
(b) Do not mix alkaline, standard (carbon-zinc) or rechargeable (nickel-cadmium) batteries.
3. If the unit is not to be used for an extended period of time, remove all the batteries.
WARNING
To avoid the memory loss from the Caller ID phone while changing batteries,
- Do not disconnect the AC-DC adaptor from the unit;
- Replace all the old batteries with new ones as soon as possible.
INSTALLATION
Be sure that the batteries are installed correctly.
Wrong polarity may damage the unit.
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Figure 1
Figure 2