Power Supply Circuit - Panasonic KX-TC2106UAB Service Manual

KX-TC2106UAB / KX-TC2106UAS / KX-TC2106UAT / KX-TC2106UAW

14.2. Power Supply Circuit

The power supply to the CPU and RF IC from AC Adaptor (+12V) is shown in the diagram below.
The base unit power supply is DC12V. The handset power is supplied from DC 3.6V battery (Nickel-Cadmium battery) which
is installed in the handset.
Power supply for transmitter is turned on by pressing "TALK" key on the handset. During the stand-by mode, the unit stops
transmitting but receives the signal.
During on-hook condition (the handset is placed on the base unit), backup power for memory of the last dialed number is
supplied through the battery (DC 3.6V Nickel-Cadmium in the handset). The memory of this unit is not backed up by the current
from the telephone line.
The base unit DC power supply is regulated by Q101, D103. The CPU power is supplied from IC401. IC401 detects AC Adaptor
power failure and maintains the unit security code.
<Fig. 1>
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