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Panasonic KX-FT21RS 2.3.4.2.Communication Section, facsimile section, 2.3.4.2.1. Defective

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KX-FT21RS

2.3.4.2.Communication Section

Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in 2.3.4.2.1. Defective

facsimile section.

32

Contents

(Russia) CONTENTS Page 1 INTRODUCTION 7 FOR THE SCHEMATIC DIAGRAMS 8 PRINTED CIRCUIT BOARD 1 INTRODUCTION 1.1.SAFETY PRECAUTIONS 1.2.INSULATION RESISTANCE TEST 1.3.FOR SERVICE TECHNICIANS 1.4.BATTERY CAUTION 1.5.AC CAUTION 1.6.PERSONAL SAFETY PRECAUTIONS 1.7.FEATURES 1.8.SPECIFICATIONS 1.9.OPTIONAL ACCESSORIES 1.10. CCITT No. 1 TEST CHART 1.11. LOCATION OF CONTROLS 1.12. CONNECTIONS 1.13. INSTALLATION (Delete) 1.13.4. To select characters with the dial keypad 1.13.5. Documents you can send 1.14. MAINTENANCE ITEMS AND COMPONENT LOCATIONS Page 1.14.3. MAINTENANCE 1.14.3.1. CLEANING THE DOCUMENT FEEDER UNIT Disconnect the power cord and the telephone line cord Caution: 1.14.3.2. CLEANING THE THERMAL HEAD Do not push on the black cover 1.14.3.3. CLEANING THE PICK UP ROLLER ........Refer to 4 DISASSEMBLY INSTRUCTION 2 TROUBLESHOOTING GUIDE 2.1.TROUBLESHOOTING SUMMARY 2.2.USER RECOVERABLE ERRORS 2.2.1.Document Jam 2.3.TROUBLESHOOTING DETAILS Page Page Page Page 3.Multiple feed 3.1. ADJUSTING THE FEED PRESSURE 4.Skew Page Page Page Page 2.3.4.2.Communication Section 2.3.4.2.1. Defective facsimile section Page Page 3.Reception problem There is the receiving problem when sometimes the below errors may be occurred OUT OF PAPER CHECK COVER CHECK DOCUMENT PAPER JAM 2.2. User Recoverable Errors Page The following 2 causes can be considered for this Cause 1: (Cause and Countermeasure) (A)The TEL/FAX DELAYED RING count should be 1. (User parameter: code No. 78) (B) (Causes and Countermeasures) (Cause A) (Countermeasure A) (Cause B) (Countermeasure B) Transmission Operation: Reception Operation: Page 2.4.4. Service Function Table Countermeasure Page Page Page Page Page Page Page 2.3.4.2.2.Remote programming 2. Program mode table 1. Entering the remote programming mode and Changing service codes Hint: Page 2.Program Mode Table 2.4.4. SERVICE FUNCTION TABLE 2.3.4.3.Digital Board Section Please refer to the 2.3.4.3.1. Digital Block Diagram Diagram Block Digital Page Page I/O and Pin No. Diagram Page Page NG Example 2.3.4.3.2.Check the Status of the Digital Board 2.3.4.4.Analog Board Section Page 2.3.4.5.Power Supply Board Section 1.Key components for troubleshooting Caution: Page Page 3.Broken parts repair details (D101, D102, D103, D104) 2.3.4.6.Operation Board Section 2.3.4.7.Sensor Section 2.3.4.8.Read Section Page Page 2.4.PROGRAMMING AND LISTS Page 2.4.4.SERVICE FUNCTION TABLE See 2.2. USER RECOVERABLE ERRORS See 2.3.4.2.1. Defective facsimile section See 2.6.1. PRINTOUT EXAMPLE 2.4.5.SERVICE MODE SETTINGS (Example of a printed out list) 2.4.6.OTHER 2.5.TEST FUNCTIONS 2.5.1.DTMF SIGNAL TONE TRANSMIT SELECTION 2.5.2.BUTTON CODE TABLE 2.5.3.PRINT TEST PATTERN 2.6.JOURNAL Page 3 ADJUSTMENTS 3.1.ADJUSTING THE FEED PRESSURE 4 DISASSEMBLY INSTRUCTIONS Page Page Page Page Page Page Page Page Page Page 5 HOW TO REPLACE THE FLAT PACKAGE IC 5.1.PREPARATION 5.2.FLAT PACKAGE IC REMOVAL PROCEDURE 5.3.FLAT PACKAGE IC INSTALLATION PROCEDURE 5.4.BRIDGE MODIFICATION PROCEDURE 6 CIRCUIT OPERATIONS 6.1.CONNECTION DIAGRAM 6.2.GENERAL BLOCK DIAGRAM Diagram Block General SECTION CONTROL 6.3.2.ASIC (IC1) This custom IC is used for general FAX operations 1.CPU This model uses a Z80 equivalent CPU operating at 6MHz 2.RTC Page Page Page 6.3.3.ROM (IC2) 6.3.4.RAM (IC3) 6.3.5.Reset Circuit 6.3.6.SRAM and RTC BACK UP CIRCUIT 1.Function 2.Circuit Operation 6.3.7.SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE 6.3.8.LED ARRAY(CIS) 6.4.FACSIMILE SECTION 6.4.2. Block Diagram 6.4.3.THERMAL HEAD This unit utilizes state of the art thermal printer technology 6.3.1. Block Diagram Accordingly, the strobe width is determined Page 6.4.4.SCANNING BLOCK 6.4.5.STEPPING MOTOR DRIVE CIRCUIT 6.4.6.GEAR SECTION 6.4.6.1.Mode Selection Fig. A Fig. B 6.4.6.2.Mode Operation A: Transmit mode B: Receive mode C: Copy mode 6.4.6.3.Mechanical Movements in the Main Operations 6.4.6.3.2.Scanning 6.4.6.3.3.Printing Page 6.5.SENSORS AND SWITCHES 6.5.1.Motor Position Sensor 6.5.2.Recording Paper Sensor (SW201) 6.5.3.Read Position Sensor (PS2) 6.5.4.Document Sensor (PS1) 6.6.MODEM SECTION Phase E 4.Concerning Transmission Time Control time: Image transmission time: Hold time: Explanation of Signals Signal.....DIS (Digital Identification Signal) Identification Signal Format.....00000001 Function: Signal.....DCS (Digital Command Signal) Identification Signal Format.....X1000001 (Example) Page b. Redundancy Compression Process Coding Mode 6.6.2.MODEM CIRCUIT OPERATION 1.Facsimile Transmission/DTMF Line Send 2.Facsimile Reception 3.DTMF Transmission (DTMF Monitor Tone) Unit Block 6.8.NCU SECTION 6.8.5.LINE AMPLIFIER AND SIDE TONE CIRCUITS 6.9.ITS (Integrated telephone System) and MONITOR SECTION 6.10. EXT. TEL Diagram Circuit 6.11. OPERATION PANEL 6.11.2. SENSOR DETECTION 6.11.3. LCD CONTROL 6.12. POWER SUPPLY BOARD SECTION Page [Surge Absorber Circuit] [Control Circuit and Detecting Circuit] [Over Current Limiter (O.C.L)] [Over Voltage Circuit] Dummy load method (to quickly check the power supply output) 7 FOR THE SCHEMATIC DIAGRAMS 8.1.PRINTED CIRCUIT BOARD (DIGITAL BOARD): COMPONENT VIEW IC2 TP2 TP4 TP3 8.2.PRINTED CIRCUIT BOARD (DIGITAL BOARD): BOTTOM VIEW TP9 TP6 8.3.PRINTED CIRCUIT BOARD (ANALOG BOARD): COMPONENT VIEW ZNR2 CN2 8.4.PRINTED CIRCUIT BOARD (ANALOG BOARD): BOTTOM VIEW 8.5.PRINTED CIRCUIT BOARD (SWITCHING POWER SUPPLY) (COMPONENT VIEW) PRIMARY 8.6.PRINTED CIRCUIT BOARD (OPERATION BOARD) 9.1.SCHEMATIC DIAGRAM (DIGITAL CIRCUIT) 9.2.SCHEMATIC DIAGRAM (ANALOG CIRCUIT) Page 9.4.SCHEMATIC DIAGRAM (OPERATION CIRCUIT) 10 TERMINAL GUIDE OF THE IC´S TRANSISTORS AND DIODES 11 FIXTURES AND TOOLS 12 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 12.1. OPERATION PANEL SECTION 12.2. UPPER CABINET SECTION 12.3. LOWER CABINET/P.C.B. SECTION 12.4. MOTOR SECTION 12.5. ACTUAL SIZE OF SCREWS AND WASHER 13 ACCESSORIES AND PACKING MATERIALS 14 REPLACEMENT PARTS LIST 14.1.CABINET AND ELECTRICAL PARTS DIGITAL BOARD PARTS Page ANALOG BOARD PARTS Page OPERATION BOARD PARTS 14.5.POWER SUPPLY BOARD PARTS FIXTURES AND TOOLS