For the Schematic Diagrams | Panasonic KX-FT21RS manual

KX-FT21RS

7 FOR THE SCHEMATIC DIAGRAMS

Note:

1.DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2.The schematic diagrams and circuit board may be modified at any time with the development of new technology.

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Image 140

Panasonic KX-FT21RS manual For the Schematic Diagrams

Contents

KX-FT21RS Contents Safety Precautions For Service TechniciansBattery Caution Insulation Resistance Test AC Caution Live Electrical Sections Personal Safety PrecautionsMoving Sections of the Unit Features GeneralFacsimile Integrated telephone system Specifications Optional Accessories Ccitt No Test Chart Control Panel Location of ControlsOverview Connections Document Stacker InstallationInstalling the Recording Paper Setting Your Logo # , thenExample Bill Press START/COPY/SET To select characters with the dial keypad Documents you can send Outline Maintenance Items and Component LocationsMaintenance Check ITEMS/COMPONENT Locations 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 Refer to 4 Disassembly Instruction Cleaning the Thermal HeadCleaning the Pick UP Roller Precautions Troubleshooting SummaryTroubleshooting 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 Cause and Countermeasure Erroneous detection due to an echo or echo cancelerEcho/Echo Canceler 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 read position PS2 Sensor SectionCheck the document sensor PS1 Read Section Refer to 6.4.4. Scanning Block KX-FT21RS Thermal Head Section Refer to 6.4.3. Thermal Head Operation Flow Programming and ListsOperation 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 Print Test Pattern Dtmf Signal Tone Transmit SelectionButton Code Table 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 256k AC220V+24V +5V 100 Block DiagramControl Section Asic IC1 Decodes the addressExecute modulation and demodulation for the FAX Transmits the recorded data to the thermal head 102 103 104 Vddc RAM IC3 Reset CircuitROM IC2 Circuit Operation Sram and RTC Back UP CircuitFunction 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 117 See 6.5. Sensers and SwitchesScanning Printing Copying 118 119 Sensors and SwitchesAll of the sensor and switches are shown below 120 Motor Position SensorRecording Paper Sensor SW201 121 Read Position Sensor PS2Document Sensor PS1 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 157 158 159 This replacement parts list is for KX-FT21RS onlyCabinet and Electrical Parts Digital Board Parts 160 161 Analog Board Parts 162 163 Operation Board Parts 164 Power Supply Board Parts 165 Fixtures and Tools