Circuit Operation (Handset); Construction; Power Supply Circuit - Panasonic KX-TG2260BXS Service Manual

KX-TG2260BXS / KX-TGA228BXS

18 CIRCUIT OPERATION (HANDSET)

18.1. Construction

The circuit mainly consists of DSP and RF unit as shown in the block diagram.
18.1.1. DSP:IC201
Function
• • • • Battery Low, Power down detect circuit
• • • • Ringer Generation
• • • • Interface circuit
RF unit, speaker, mic, LED, Key scan, LCD, Headset
18.1.2. RF unit
Mainly voice signal is modulated to RF, or it goes the other way.
18.1.3. EEPROM: IC202
All setting data is stored.
ex: ID code, user setting (Flash Time, Tone/Pulse)

18.2. Power Supply Circuit

Voltage is supplied separately to each block.
62