Power Supply Circuit | Panasonic KX-TC2000NZF, KX-TC2000NZB instruction

KX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF

19.2. 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 receives the 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. The memory of this unit is not backed up by the current from

the telephone line.

The base unit DC power supply is regulated by Q18, the CPU power is regulated by Q19. The Q401, Q403 detects AC Adaptor power failure and maintains the unit security code.

Fig. 1

41

Image 41

Panasonic KX-TC2000NZF, KX-TC2000NZB, KX-TC2000NZW manual Power Supply Circuit

Contents

KX-TC2000NZB KX-TC2000NZW KX-TC2000NZF Contents Cabinet and Electrical Parts Location Handet Suggested PbF Solder About Lead Free Solder PbF Pb free Base Unit Main PCB How to recognize that Pb Free solder is used For Service Technicians Recharge Battery information Battery Battery Replacement Base Unit Handset Location of Controls Connection For Service Hint Making Calls Answering Calls Operations KX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF KX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF Recall Button Show in Fig Procedure To remove Remove Disassembly Instructions Rear Cabinet Battery compartment cover Troubleshooting Guide Check Power Bell Reception Check Battery Charge CPU IC2 RF IC IC1 Check Link Refer to Adjustment P.29 Check Handset Reception Check Handset Transmission Test Mode Flow Chart Base Unit Adjustments Base Unit Adjustment How to change the channel IC1 Adjustment Standard Base Unit Test Mode Flow Chart Handset Adjustments Handset IC1 How to change the channel Adjustment Component View Adjustment Standard Handset Flow Solder Side View Base Unit RF SpecificationHOW to Check the Handset Speaker Frequency Table MHz STAND-BY TALK, Talk STAND-BY Explanation of CPU Data Communication Ringing Changing the Channel Ports for transmitting and receiving of data RF IC IC1 Block Diagram Base Unit IC2 Block Diagram Handset Outline Circuit Operation Power Supply Circuit Reset Circuit Base Unit Dtmf Charge CircuitTelephone Line Interface Base to Handset Transmitter/Receiver Handset to Base Signal Route Circuit Operation Handset Reset Circuit Handset Battery Low / Power Down Detector 21.1. IC2 22.1. IC2 23.1. IC1 Procedure HOW to Replace Flat Package ICModification Procedure of Bridge Preparation Cabinet and Electrical Parts Location Base Unit Cabinet and Electrical Parts Location Handet Accessories and Packing Materials Cabinet and Electrical Parts Replacement Parts List Diodesi LED LED1 ERDS2TJ223 PQXA36ASVC Battery Accessories and Packing Materials Handset Schematic Diagram Handset For Schematic DiagramBase Unit Schematic Diagram Base Unit 30.1 Base Unit Schematic Diagram Base Unit FILTER\2 RF Unit Base Unit Schematic Diagram Handset IC1 31.2 RF Unit Handset Memo Component View Circuit Board Base Unit RX-VCO TX-VCO Flow Solder Side View IC2 IC1 KXTC2000NZB