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KX-TG6611RU/KX-TG6611UA/KX-TG6611CA/KX-TG6612CA/KX-TGA661RU
4.5. Circuit Operation (Charger Unit)
4.5.1. Power Supply Circuit
The power supply is as shown.
4.6. Behavior of Electric Power Failure
In case that the power from AC adaptor is lost and lose radio waves, BBIC (IC1) turns IC6 ON since handset presumes that
base unit's power is failed.
Base unit detects that power voltage of AC adaptor +5.5V is OFF at IC351, then turns Q351 ON.
It's possible to use the units during the power failure, supplying power to VBAT of base unit from battery of handset through IC7,
CHG terminal and Q351.
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