Block Diagram (Handset); Circuit Operation (Handset); Outline; Reset Circuit - Panasonic KX-TC2106UAB Service Manual

16 CIRCUIT OPERATION (HANDSET)

16.1. Outline

Handset consists of the following ICs as shown in BLOCK DIAGRAM (HANDSET) (P.38).
• • • • CPU: IC701
− − − − Forming/analyzing all data signals (ACK or CMD signal)
− − − − All interfaces (ex; LED, Key, Buzzer, Detector Circuit, Charge/Battery Low)
− − − − RAM for keeping the data (CH Number, ID Code, etc.)
• • • • RF IC: IC801
− − − − PLL Oscillator
− − − − Detection
− − − − Compress/Expander
− − − − 1st/2nd mixer
− − − − Amplifier for transmission and reception

16.2. Reset Circuit

The power of handset is supplied by battery.
Whenever the battery is recharged or inserted, the impulse at CHG+ becomes Reset signal through Q704, and it is sent to CPU.
KX-TC2106UAB / KX-TC2106UAS / KX-TC2106UAT / KX-TC2106UAW
<Fig. 4>
<Fig. 5>
39