Schematic Diagram Analog Circuit, 148 | Panasonic KX-FT21RS specs

KX-FT21RS

9.2.SCHEMATIC DIAGRAM (ANALOG CIRCUIT)

FAX TX

FAX RX

LINE ON/OFF, DIALPULSE

3.3V

0V

FAX RX, TEL TALK

2V

BELL DETECT

5V

0V

2.1V

FAX RX, HANDSET TX

12V

NO PAPER: 5V

PAPER: 0V

2V

148

Image 148

Panasonic KX-FT21RS manual Schematic Diagram Analog Circuit, 148

Contents

KX-FT21RS Contents Safety Precautions For Service TechniciansBattery Caution Insulation Resistance Test AC Caution Moving Sections of the Unit Personal Safety PrecautionsLive Electrical Sections Features GeneralFacsimile Integrated telephone system Specifications Optional Accessories Ccitt No Test Chart Overview Location of ControlsControl Panel Connections Installing the Recording Paper InstallationDocument Stacker Setting Your Logo # , thenExample Bill Press START/COPY/SET To select characters with the dial keypad Documents you can send Maintenance Check ITEMS/COMPONENT Locations Maintenance Items and Component LocationsOutline Maintenance List Maintenance Cycle Maintenance Cleaning the Document Feeder Unit Disconnect the power cord and the telephoneClean the document feeder rollers, sub roller Line cord Cleaning the Pick UP Roller Cleaning the Thermal HeadRefer to 4 Disassembly Instruction Troubleshooting Troubleshooting SummaryPrecautions User Recoverable Errors Document Jam Troubleshooting Details Starting Troubleshooting Simple Check List Troubleshooting Items Table ADF Auto Document Feed Section No document feed Paper JAM Multiple feed Skew Image is distorted When printing Black or white vertical lines appear Skewed receiving image KX-FT21RS KX-FT21RS Communication Section Facsimile section Transmit problem Defective facsimile section Sometimes there is a transmit problem Reception problem Check Document Paper JAM Unit can copy, but cannot transmit/receive Echo/Echo Canceler Erroneous detection due to an echo or echo cancelerCause and Countermeasure Causes and Countermeasures Cause a Countermeasure aCause B Countermeasure B Transmission Operation Reception Operation How to output the Journal Report TX=TRANSMISSION RX=RECEPTION Countermeasure KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS Remote programming Hint KX-FT21RS Program Mode Table YES/NO 996 Journal Please refer to the 2.3.4.3.1. Digital Block Diagram Digital Board Section Digital Block Diagram KX-FT21RS Normal Wave Patterns Pin No. Diagram KX-FT21RS KX-FT21RS NG Example Check the Status of the Digital Board Analog Board Section Defective ITS Integrated Telephone System Section Power Supply Board Section Key components for troubleshooting Troubleshooting Flow Chart KX-FT21RS Broken parts repair details D101, D102, D103, D104 Operation Board Section No key operation No LCD indication Check the document sensor PS1 Sensor SectionCheck the read position PS2 Read Section Refer to 6.4.4. Scanning Block KX-FT21RS Thermal Head Section Refer to 6.4.3. Thermal Head Operation Programming and ListsOperation Flow Above values are the default values Service Function Table 3ALL Service Mode Settings Example of a printed out list See 2.6.1. Printout Example Other Test Functions Button Code Table Dtmf Signal Tone Transmit SelectionPrint Test Pattern Descriptions Compression Code MH/MRMslt means Minimum Scan Line Time. Used only at the factory EQM Printout Example Adjustments Adjusting the Feed Pressure Disassembly Instructions KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS KX-FT21RS Flat Package IC Removal Procedure Preparation KX-FT21RS Connection Diagram General Block Diagram Codec IC5 D/A converter +24V +5V AC220V256k Control Section Block Diagram100 Asic IC1 Decodes the addressExecute modulation and demodulation for the FAX Transmits the recorded data to the thermal head 102 103 104 Vddc ROM IC2 Reset CircuitRAM IC3 Function Sram and RTC Back UP CircuitCircuit Operation Supervision Circuit for the Thermal Head Temperature LED Arraycis Facsimile Section Image Data Flow During Facsimile OperationCopy Fine, Super-Fine, Half Tone Transmission Block Diagram AnalogFront/End Head 110 Thermal Head 112 Scanning Block Stepping Motor Phase Pattern Stepping Motor Drive Circuit Mode Selection Gear Section Mode Operation Transmit modeReceive mode Copy mode Scanning Printing See 6.5. Sensers and Switches117 Copying 118 All of the sensor and switches are shown below Sensors and Switches119 Recording Paper Sensor SW201 Motor Position Sensor120 Document Sensor PS1 Read Position Sensor PS2121 Modem Section FunctionOn ITU-T International Telecommunications´ Union Definition of Each Group Concerning Transmission Time Control timeImage transmission time Hold time 124 DIS/DTC DCS 125 126 CFR Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format 127 Modem Circuit Operation Analog Unit NCU Section GeneralLine Relay RLY1 Bell Detection Circuit Line Amplifier and Side Tone Circuits Monitor Circuit Handset Circuit EXT. TEL Diagram Circuit Analog Switch IC1 Control Operation PanelKEY Scan Key Matrix Sensor Detection LCD Control Power Supply Board Section This power supply board uses the switching regulator methodInput Circuit Rectifier Circuit KX-FT21RS Surge Absorber Circuit Control Circuit and Detecting CircuitOver Current Limiter O.C.L Over Voltage Circuit For the Schematic Diagrams Printed Circuit Board 141 TP8 TP7 C26 142 D104 D103 SW201C230 C231 C106 C225 L203 IC101R215 Q203 F101 145 Printed Circuit Board Operation Board 146 Schematic Diagram 147 Schematic Diagram Analog Circuit 148 Schematic Diagram Switching Power Supply 149 Schematic Diagram Operation Circuit 150 151 152 Operation Panel Section 153 Upper Cabinet Section 154 Lower CABINET/P.C.B. Section 155 Motor Section Actual Size of Screws and Washer 157 158 Cabinet and Electrical Parts This replacement parts list is for KX-FT21RS only159 Digital Board Parts 160 161 Analog Board Parts 162 163 Operation Board Parts 164 Power Supply Board Parts 165 Fixtures and Tools