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Panasonic KX-TC2000NZB, KX-TC2000NZF, KX-TC2000NZW 19.2. Power SupplyCircuit

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19.2. Power SupplyCircuit

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 isregulat ed byQ18, the CPU power is regulated by Q19. The Q401, Q403 detects AC Adapto r

power failure and maintains the unit security code.

Fig. 1

KX-TC2000NZB / KX-TC2000NZW / KX- TC2000NZF

Contents

Main CONTENTS Page Page Page 1 ABOUT LEAD FREE SOLDER (PbF: Pb free) 1.1. Suggested PbF Solder 1.2. How to recognize that Pb Free solder is used 1.2.1. Base Unit Main PCB Marked 1.2.2. Handset PCB Marked Page Page Page Page 7 CONNECTION Page Page Page Page Page Page Page 10 TROUBLESHOOTING GUIDE 10.1. Check Power 10.2. Bell Reception 10.3. Check Battery Charge Page Page Page 11 ADJUSTMENTS (BASE UNIT) 11.1. Test Mode Flow Chart (Base Unit) 11.2. How to change the channel *: Refer to Flow Solder Side View (P.68). 11.3. Adjustment 11.4. Adjustment Standard (Base Unit) When connecting the Simulator and Equipments for checkin g,please refer to the illustrat ion below. IC2 IC3 IC1 12 ADJUSTMENTS (HANDSET) 12.1. Test Mode Flow Chart (Handset) 12.2. How to change the channel 12.3. Adjustment 12.4. Adjustment Standard (Handset) (A) Battery Low T1 T6 DPX1 (Flow Solder Side View) IC1 Note: (A)-(I) is refered to ADJUSTMENTS (HANDSET) (P.28) 13 RF SPECIFICATION 13.1. Base Unit 13.2. Handset 14 HOW TO CHECK THE HANDSET SPEAKER 15 FREQUENCY TABLE (MHz) Page Page Page 16.5.1. Handset 16.5.2. Base Unit 17 BLOCK DIAGRAM (BASE UNIT) RF IC IC1 TELEPHONE LINE INTERFACE CPU IC2 POWER SUPPLY RESET CHARGE 18 BLOCK DIAGRAM (HANDSET) RF IC IC1 CPU IC2 19 CIRCUIT OPERATION 19.1. Outline 19.2. Power SupplyCircuit Page 19.4. Charge Circuit 19.5. Telephone Line Interface 19.6. DTMF 19.7. Transmitter/Receiver 19.7.1. Base to Handset 19.7.2. Handset to Base 19.7.3. RF signal operation/control and PLLoperation (RFUNIT) Page Page 20.2. Battery Low / Power Down Detector Page Page Page 24 HOW TO REPLACE FLAT PACKAGE IC 24.1. Preparation 24.2. Procedure 24.3. Modification Procedure of Bridge Page Page Page 28 REPLACEMENT PARTS LIST 28.1. Base Unit 28.1.1. CABINET ANDELECTRICAL PARTS 28.1.2. MAIN P.C.BOARDPARTS Page 28.2. Handset 28.2.1. CABINET AND ELECTRICAL PARTS 28.2.2. MAIN P.C.BOARD PARTS 28.3. ACCESSORIES AND PACKING MATERIALS 29 FOR SCHEMATIC DIAGRAM 30 SCHEMATIC DIAGRAM (Base Unit) 30.1. Base Unit IC5 IC3C IC3A 30.2. RF Unit (Base Unit) RX TX KX-TC2000NZB/NZW/NZF SCHEMATIC DIAGRAM (Base Unit) 4.4V455kHz 10.695MHz IC1 31 SCHEMATIC DIAGRAM (Handset) 31.1. Handset 3.9V0V IC2 3.9V to 0V 31.2. RF Unit (Handset) 2.1V 455kHz RX TX KX-TC2000NZB/NZW/NZF SCHEMATIC DIAGRAM (RF Unit (Handset)) Page 32 CIRCUIT BOARD (Base Unit) 32.1. Component View C95 T7 R107 32.2. Flow Solder Side View (RF IC: 36) IF IN GND TX-VCO 2nd Mix IC2 33 CIRCUIT BOARD (Handset) 33.1. Component View Battery Low RSSI T1 33.2. Flow Solder Side View IC1 RX VCO TXPOWER 2nd Mix (RF IC: 36) TXGND