Panasonic KX-TC1205RUF, KX-TC1205RUW, KX-TC1205RUB, KX-TC1205RUS manual Power Supply Circuit

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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF

16.2. Power Supply Circuit

The power supply to the CPU (Digital, Analog) and RF IC from AC Adaptor (+12V) is shown in the diagram below.

The base unit power supply is DC12V. The handset´s power is supplied from 3.6V battery (Nickel-Cadmium battery) which is installed in the handset.

Power supply for transmitter is turned on by a press of "Talk" key on the handset. During the stand-by mode, the unit stops transmitting but receive thhe signal.

Also during on-hook condition (the handset is placed on the base unit), backup power for memory of the last dialed number is supplied through the battery (3.6V nickel-cadmium in the handset). The memory of this unit is not backed up by the curreent from the telephone line.

The base unit DC power supply is regulated by Q18, the CPU power is regulated by Q19. The Q8, detects AC Adaptor powerfailure and maintains the unit cecutiry cord;

Fig. 1

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Contents KX-TC1205RUB KX-TC1205RUW KX-TC1205RUS KX-TC1205RUF Contents Accessories and Packing Materials Recharge Battery information BatteryBattery Replacement Base Unit Handset Location of ControlsConnection KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Adding Another Phone Making Calls Answering Calls OperationsKX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Flash Button Show in Fig To remove Remove Disassembly InstructionsRear Cabinet Battery compartment cover Troubleshooting Guide Check Power Bell Reception Check Battery Charge CPU IC2 RF IC IC1 Check LinkRefer to Adjustment P.27 Check Handset Reception Check Handset TransmissionTest Mode Flow Chart Base Unit Adjustments Base UnitAdjustment How to change the channelIC3 Adjustment Standard Base UnitTest Mode Flow Chart Handset Adjustments HandsetIC1 How to change the channel AdjustmentComponent View Adjustment Standard HandsetFlow Solder Side View RF Specification HOW to Check the Handset SpeakerBase Unit Frequency Table MHz STAND-BY TALK, Talk STAND-BY Explanation of CPU Data CommunicationRinging Changing the Channel Ports for transmitting and receiving of data IC1 Block Diagram Base UnitIC1 Block Diagram HandsetOutline Circuit OperationPower Supply Circuit Reset Circuit Base Unit Telephone Line Interface Charge CircuitBase to Handset Transmitter/ReceiverHandset to Base Signal Route Circuit Operation Handset Reset Circuit HandsetBattery Low / Power Down Detector 18.1. IC2 19.1. IC2 Preparation HOW to Replace Flat Package ICProcedure Modification Procedure of BridgeCabinet and Electrical Parts Location Base Unit Cabinet and Electrical Parts Location Handet Accessories and Packing Materials Cabinet and Electrical Parts Replacement Parts ListDiodesi ZNR1 ERJ3GEYJ514 PQXA36ASVC Battery ERJ3GEYJ202 Accessories and Packing Materials For Schematic Diagram Base Unit Schematic Diagram Base UnitHandset Schematic Diagram Handset 26.1 Base Unit Schematic Diagram Base UnitFILTER\2 26.2 RF Unit Base Unit27.1 Handset Schematic Diagram Handset450kHz RF Unit HandsetKX-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