Panasonic KX-TS580MXB - Page 10

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KX-TS580MXB/KX-TS580MXW/KX-TS580MXR/KX-TS580MXC/KX-TS580MXJ
4.2.3.4.2. Circuit operation
When the batteries are inserted into the unit, then the voltage is regulated by IC302 and power is supplied to the CPU. The unit
starts operating soon after the voltage goes beyond point A in the voltage diagram.