Panasonic KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF Service Manual ▷ View online
17 CIRCUIT OPERATION (HANDSET)
17.1. Reset Circuit (Handset)
The power of handset is supplied by battery.
Whenever the battery is recharged or inserted, the impulse at CHG+ becomes Reset signal through Q11, and sent to CPU.
Fig. 4
Fig. 5
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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
17.2. 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 inside of RF IC. The detected voltage is as follows;
are inside of RF IC. The detected voltage is as follows;
•
•
Battery Low
Battery voltage : V(Batt) < 3.57V
The CPU detects this level and “Recharge battery” LED starts flashing.
•
•
Power Down
Battery voltage : V(Batt) < 3.3V
The output of RF IC (P-DOWN) becomes low level, then CPU stops working to keep the data (CH number, ID Code, etc.)
Fig. 6
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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
18.1. IC2
18 CPU DATA (Base Unit)
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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
19.1. IC2
19 CPU DATA (Handset)
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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
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