Panasonic KX-TG1070FXB, Руководство по обслуживанию

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KX-TG1070FXB/KX-TG1070FXC/KX-TG1072FXB/KX-TGA107EXB/KX-TGA107EXC
4.2. Circuit Operation (Base Unit)
The base-station consists of base band controller, speech network, tel-line interface, RF module, linear regulator, EEPROM,
crystal and so on. Refer to
Block Diagram (Base Unit) (P.7).
4.2.1. Base Band Controller
These are parts to control all function of the base-station, we used the Philips XS which is controller for DECT. These devices
include all control circuits of the base-station for RF module, tel-line interface, ADPCM codec, series regulator and so on.
4.2.2. Power Supply
The power supply consists with CM1117 voltage regulator ICs.
CM1117 generate DC 3.3V voltage from DC 6V voltage from adaptor. DC 3.3V are used for RF module & I/O port, DC 2.5V &
DC1.8V are used for the base band controller and the circumference circuits.
4.2.3. Speech Network
The TR circuit is used for speech network. The function of this connects tel-line interface and the base band controller.
4.2.4. TEL Line Interface
The function of this connects tel-line and speech network. Also, the tel-line interface include the ring detect circuit, caller-ID cir-
cuit.
4.2.5. EEPROM
This is 8K bits memory. The each kind of value to set-up at power-on, redial memory, speed-dialing memory, and so on are
stored in this device.
4.2.6. RF Module
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.
4.2.7. Current Limiter
The current limiter is circuit to supply the proper current to charge batteries of the handset from DC 6V voltage.