KX-TG1077UAB, KX-TG1077UAJ, KX-TG1077UAW, KX-TGA107UAB, KX-TGA107UAJ, KX-TGA107UAW - Panasonic Telephone Service Manual (repair manual). Page 10

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The handset consists of Base Band Controller, LCD, RF module, keypad, regulator, charger, EEPROM, crystal, earpiece, ringer
& microphone, and so on.

The base band controller controls all function of the handset, Philips XS for the base band controller is used.
This device include all control circuits of the handset for RF module, LCD controller, keypad interface, earpiece, microphone,
ADPCM codec, switching and series regulator and so on.

The base-station supply DC 6V power to the charger and the charger charges the batteries to use this power. The signal on the
charger circuit is generated when the handset is to being charged this signal is used to control the charger circuit and for auto-
matic off-hook by cradle-off when an incoming call is coming.

The battery is (2.4V / 2cell) directly supplied to switching regulator which controlling by base band controller and step up the DC
3.3V to the RF module & I/O port. DC 2.5V & DC1.8V are used for the base band and the circumference circuits.

Receiver part: RF signals induced at the antenna are extracted by the RF control interface. The RF signal to be selected is
demodulated into RX_DATA signals. And signals is passed to the base band controller.
Transmitter part: The signal from transceiver chip-set is fed to the antenna through the RF power amplifier by control of the RF
control interface. And then this signal is radiated from antenna.
Logical part: The frequency to be used is generated in transceiver chip-set by control signals (CLK, DATA, ENABLE, SYRI) of
the RF control interface.

The LCD consists of 7-segment, 12 digit display and 13 icon which controlling by the LCD display driver.

The keypad consists of 12 dialing keys and 8 function keys.