Panasonic KX-TS105LXW Service Manual page 23

Integrated telephone system
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11.3.4. Inializing Circuit
11.3.4.1. Function
This circuit is used for to initialize the microcomputer when it incorporates batteries.
11.3.4.2. Circuit operation
When the batteries is inserted into the unit, then the voltage is shifted by D304 and power is
supplied to the CPU. The set can operate beyond point A in the circuit voltage diagram.
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