Panasonic KX-TC1743B, Service Manual

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ex: Telephone Directory number, Caller ID data, ID code
- Settings
ex: message numbers, caller ID numbers, pulse tone dial
13.3. Power Supply Circuit
Function:
The power supply voltage from AC adaptor is converted to the desired voltage of each block.
Circuit Operation:
This unit supplies the voltage to each block as shown below.
13.3.1. Charge Circuit
The voltage from the AC is supplied to the main charge circuits. Normal charge (70 mA) of
maximum 20-hours is started soon after the Handset is placed on the base unit. Then it changes
to trickle charge (15 mA on the average) to prevent from overcharging.
Normal charge : Q150 is ON
Trickle charge : Q150 is OFF
13.4. Reset Circuit
Function:
This circuit is used for to initialize the microcomputer when it incorporates an AC adaptor.
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