Matsushita Electric KX-TC1461LAB, Service Manual

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14.2. Reset Circuit/Charge Circuit
The power of handset is supplied by battery.
Whenever the battery is recharged or inserted, the impulse at CHG1 becomes Reset signal
through D11, and sent to CPU.
*Refer to
Charge Circuit ().
<Fig. 201>
14.3. Battery Low / Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by RF IC which check the voltage from battery.
Shortly, every detected blocks are inseide of RF IC. The detected voltage is as follows;
- Battery Low
Battery voltage : V(Batt) < 3.57V
The CPU detects this level and IN USE “ ” starts flashing.
- Power Down
Battery voltage : V(Batt) < 3.36V
The output of RF IC (P-DOWN) becomes low level, then CPU stops
working to keep the data (CH number, ID Code, etc.)
<Fig. 202>
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