Panasonic KX-TC1205RUS, KX-TC1205RUW, KX-TC1205RUB, KX-TC1205RUF Battery Low / Power Down Detector

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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;

∙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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Image 46

Contents KX-TC1205RUB KX-TC1205RUW KX-TC1205RUS KX-TC1205RUF Contents Accessories and Packing Materials Battery Recharge Battery informationBattery Replacement Location of Controls Base Unit HandsetConnection KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Adding Another Phone Operations Making Calls Answering CallsKX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Flash Button Disassembly Instructions Show in Fig To remove RemoveRear Cabinet Battery compartment cover Troubleshooting Guide Check Power Bell Reception Check Battery Charge Check Link CPU IC2 RF IC IC1Refer to Adjustment P.27 Check Handset Transmission Check Handset ReceptionAdjustments Base Unit Test Mode Flow Chart Base UnitHow to change the channel AdjustmentAdjustment Standard Base Unit IC3Adjustments Handset Test Mode Flow Chart HandsetHow to change the channel Adjustment IC1Adjustment Standard Handset Component ViewFlow Solder Side View HOW to Check the Handset Speaker RF SpecificationBase Unit Frequency Table MHz Explanation of CPU Data Communication STAND-BY TALK, Talk STAND-BYRinging Changing the Channel Ports for transmitting and receiving of data Block Diagram Base Unit IC1Block Diagram Handset IC1Circuit Operation OutlinePower Supply Circuit Reset Circuit Base Unit Charge Circuit Telephone Line InterfaceTransmitter/Receiver Base to HandsetHandset to Base Signal Route Reset Circuit Handset Circuit Operation HandsetBattery Low / Power Down Detector 18.1. IC2 19.1. IC2 Modification Procedure of Bridge HOW to Replace Flat Package ICProcedure PreparationCabinet and Electrical Parts Location Base Unit Cabinet and Electrical Parts Location Handet Accessories and Packing Materials Replacement Parts List Cabinet and Electrical PartsDiodesi ZNR1 ERJ3GEYJ514 PQXA36ASVC Battery ERJ3GEYJ202 Accessories and Packing Materials Base Unit Schematic Diagram Base Unit For Schematic DiagramHandset Schematic Diagram Handset Schematic Diagram Base Unit 26.1 Base Unit26.2 RF Unit Base Unit FILTER\2Schematic Diagram Handset 27.1 HandsetRF Unit Handset 450kHzKX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Circuit Board Base Unit IC1 IC4 IC2 IC3 Circuit Board Handset RX VCO TX VCO KXTC1205RUB